0.BASIC MECHANICAL ENGINEERING

An aircraft gas turbine operates on------Bryton Cycle

One of the following methods is adopted for governing of steam turbines in a power plant---Throttle

governing

Which of the following operations cannot be performed on a lathe ----- Slotting

The pump with a low initial cost and low maintenance cost is -------- Centrifugal pump

Draft on a pattern is provided for-------------- Providing for strinkage of the casting

A refrigerant used in the domestic refrigerator is ---------Freon

Mandrels are used to hold ---------- Hollow Work pieces

The operation of enlarging of a hole is called----- Boring

Rapping allowance is provided on a pattern to take care of---------- Easy withdrawn

Feed in a lathe is expressed in------------- mm per revolution

In upcut milling the work piece is fed-------------- Against the rotating cutter

Brasses and bronzes are welded using------------- oxidizing flames

For the purpose of comparison, the steam generating capacity of a boiler is generally expressed in terms

of----------------- Equivalent evaporation

Which of the following is not used as a refrigerant ?----------- Carbon monoxide

Upsetting is the term used in one of the following operations----------- forging

Quick return motion is used in a--------------- shaper

The output of a gas turbine is 300 KW and its efficiency is 20 percent, the heat supplied is 1500 KW

Sprue is the passing provided for the-------- Inflow

Reducing flame is obtained in oxy-acetylene welding with---------Excess acetylene

In Industry of the developed nations the type of production most often occurring is------- Batch production

The melting point of the filler material in brazing should be above 420 C

Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with

velocity v is made to strike the second ball. Both the balls after impact will move with a velocity v/2

The range of projectile on a downward inclined plane is more than the range on upward inclined plane for

the same velocity of projection and angle of projection.

If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between

the two forces is 120

The objective of time study is to determine the time taken by efficient machine utilization

The friction experienced by a body, when in motion, is known as dynamic friction

One of the materials used for making surface plate is granite

One of the following function is not performed by coating on the welding electrodes increase the cooling

rate

Feeler gauges are used for measuring the clearances between mating parts

The break-even point is that volume of production where no profit exists

In a process chart the inverted triangle symbol indicates storage

One of the following objectives is not achieved by the process of annealing to increase the yield point

In oxyacetylene welding, acetylene is produced using Ca C2 and H2O

A product layout is generally suggested for continuous type of production

A micrometer screw has pitch of 0.5 mm and the thimbles has 100 equal divisions marked on it, the least

count of the instrument in mm is 0.005

The force required to move the body up the plane will be minimum if it makes an angle with the inclined

plane equal to the angle of friction.

The range of a projectile is maximum, when the angle of projection is 45

A smooth cylinder lying on its convex surface remains in _ unstable_ equilibrium.

Static friction is always greater than dynamic friction

The mechanical advantage of a lifting machine is the ratio of load lifted to the effort applied

A body will begin to move down an inclined plane if the angle of inclination of the plane is _ greater than

the angle of friction.

The unit of power in S.I. units is watt

When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the

force of gravity, the body is known as compound pendulum

If the number of pulleys in a system is equal to its velocity ratio, then it is a _ second _ system of pulleys

Coplanar concurrent forces are those forces which meet at one point and their lines of action also lie on

the same plane

During elastic impact, the relative velocity of the two bodies after impact is _ equal and opposite to the

relative velocity of the two bodies before impact.

The law of motion involved in the recoil of gun is Newton's third law of motion

If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards,

the acceleration of the lift is none of these (g/4, g/3, g/2)

The bodies which rebound after impact are called elastic bodies

One joule means that work is done by a force of 1 N when it displaces a body through 1m

The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved

part of their resultant in the same direction. This is known as principle of resolution of forces

One watt is equal to 1 joule/s

Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of

action of the resultant is 6 mm from any given force, the two forces are 15 N and 5 N

When two elastic bodies collide with each other, 1. The two bodies tend to compress and deform at the

surface of contact 2. the two bodies begin to regain their original shape

The angle between two forces when the resultant is maximum and minimum respectively are 0 and 180

The maximum frictional force, which comes into play, when a body just begins to slide over the surface of

the other body, is known as limiting friction

A redundant frame is also called _imperfect_ frame.

The force, by which the body is attracted, towards the Centre of the earth, is called weight

The velocity ratio of a first system of pulleys with 4 pulleys is 16.

Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three

sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to twice the

area of the triangle

The matter contained in a body, is called mass

The forces, which meet at one point and their lines of action also lie on the same plane, are known as

coplanar concurrent forces

The angle of inclination of the plane at which the body begins to move down the plane, is called angle of

friction

According to lamis theorem if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its

vertex and parallel to the base, is __nine times_ than that passing through its C.G. and parallel to the

base.

The total motion possessed by a body, is called as Momentum

The friction experienced by a body, when at rest, is known as Static friction

The amplitude is always _equal_ radius of the circle.

The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for

one complete oscillation,

When a body falls freely under gravitational force, it possesses __No_ weight.

The unit of energy in S.I. units is joule.

The Centre of gravity of a quadrant of a circle lies along its central radius (r) at a distance of 0.6r

In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the

effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is 100

A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass

and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

the change in momentum suffered by rubber ball is more than the lead ball

If a number of co-planer forces acting at a point be in equilibrium, the sum of clockwise moments must

be equal to__ the sum of anticlockwise moments, about any point

1.Engineering Mechanics

1. According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

2. Which of the following are vector quantities? Linear displacement, Linear acceleration, all of these.

3. The centre of gravity of a semi-circle lies at a distance of __ 4r/ 3 _ from its base measured along the vertical radius.

4. A differential pulley block has larger and smaller diameters of 100 mm and 80 mm respectively. Its velocity ratio is 10.

5. Which of the following statement is correct? The kinetic energy of a body before impact is more than the kinetic energy of a body after impact.

6. The maximum efficiency of a lifting machine is 1/m x V.R

7. The principle of transmissibility of forces states that, when a force acts upon a body, its effect is minimum, if it acts at the centre of gravity of the body

8. The angular velocity (in rad / s) of a body rotating at N revolutions per minute is 2N/60

9. The motion of a particle round a fixed axis is circular

10. The velocity ratio in case of an inclined plane inclined at angle to the horizontal and weight being pulled up the inclined plane by vertical effort is sin

11. The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as Newton's second law of motion

12. The minimum force required to slide a body of weight W on a rough horizontal plane is W tan

13. A machine having an efficiency less than 50%, is known as non-reversible machine

14. A body of weight W is required to move up on rough inclined plane whose angle of inclination with the horizontal is . The effort applied parallel to the plane is given by(where = tan = Coefficient of friction between the plane and the body.) P = W (sin + cos)

15. Which of the following is a scalar quantity? Speed

16. In ideal machines, mechanical advantage is _ equal to _ velocity ratio.

17. Non-coplaner concurrent forces are those forces which meet at one point, but their lines of action do not lie on the same plane

18. If a number of forces are acting at a point, theirresultant will be inclined at an angle with the horizontal, such that tan = V/H

19. The point, through which the whole weight of the body acts, irrespective of its position, is known as centre of gravity

20. Concurrent forces are those forces whose lines of action meet at one point

21. The forces, which meet at one point and their lines of action also lie on the same plane, are known as coplaner concurrent forces

22. The angle of inclination of the plane at which the body begins to move down the plane, is called angle of friction

23. The rate of doing work is known as Power.

24. The periodic time (T) is given by(where = Angular velocity of particle in rad / s.) 2/

25. The total energy possessed by a system of moving bodies is constant at every instant

26. The unit of work in S.I. units is Joule.

27. The static friction

is independent of the area of contact, between the two surfaces

always acts in a direction, opposite to that in which the body tends to move

bears a constant ratio to the normal reaction between the two surfaces

28. The resultant of the two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then Q =

R

29. Whenever a force acts on a body and the body undergoes a displacement, then work is said to be done

30. Varingons theorem of moments states that if a number of coplaner forces acting on a particle are in

equilibrium, then the algebraic sum of their moments about any point is equal to the moment of their resultant

force about the same point.

31. A couple produces rotational motion

32. One joule is equal to 1 N-m

33. In a screw jack, the effort required to lift the load is given by(where W = Load lifted, = Helix angle, and =

Angle of friction.) P = W tan ( + )

34. When the spring of a watch is wound, it will possess strain energy

35. For a self locking machine, the efficiency must be less than 50%

36. A framed structure is imperfect, if the number of members are either less than or greater than (2j 3).

37. A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise

to a height of 2m.

38. The rate of change of displacement of a body is called velocity

39. The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant,

unless acted upon by an external force in that direction. This statement is called principle of conservation of

momentum

40. The unit of energy in S.I. units is joule

41. The maximum mechanical advantage of a lifting machine is 1 / m

42. A machine having an efficiency greater than 50%, is known as reversible machine

43. Which of the following are vector quantities?

Angular displacement

Angular velocity

Angular acceleration

all of these

44. According to lamis theorem if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

45. If P is the force acting on the body, m is the mass of the body and a is the acceleration of the body, then according to Newtons second law of motion, P - m.a = 0

46. The energy possessed by a body, for doing work by virtue of its position, is called potential energy

47. The coefficient of restitution for inelastic bodies is zero

48. The moment of a force

is the turning effect produced by a force, on the body, on which it acts

is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the

force

is equal to twice the area of the traingle, whose base is the line representing the force and whose vertex is the point, about

which the moment is taken

all of the above

49. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is _ nine times_ than that passing through its C.G. and parallel to the

base.

50. The total motion possessed by a body, is called momentum

51. The term centroid is the same as centre of gravity

52. The friction experienced by a body, when at rest, is known as static friction

53. The matter contained in a body, is called mass

54. The law of the machine is(where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine

friction.) P = mW + C

55. A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the

following: the change in momentum suffered by rubber ball is more than the lead ball

56. Moment of inertia is the second moment of mass, second moment of force & second moment of area

57. In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is 100

58. The centre of gravity of a quadrant of a circle lies along its central radius (r) at a distance of 0.6r

59. Which of the following statement is correct in connection with projectiles?

The velocity with which a projectile is projected, is known as the velocity of projection.

The angle, with the horizontal, at which a projectile is projected is known as angle of projection.

A path, traced by a projectile in the space, is known as trajectory.

all of the above

60. A spherical body is symmetrical about its perpendicular axis. According to Rouths rule, the moment of inertia

of a body about an axis passing through its centre of gravity is(where, M = Mass of the body, and S = Sum of

the squares of the two semi-axes.) = MS/5

61. In order to completely specify angular displacement by a vector, it must fix direction of the axis of rotation,

magnitude of angular displacement & sense of angular displacement

62. A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

upward at its upper end

63. A pendulum which executes one beat per second is known as second's pendulum.

64. The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the

opposite directions. These forces are known as unlike parallel forces

65. The unit of force in S.I. system of units is newton

66. The length of a seconds pendulum is 99.4cm

67. Two forces are acting at an angle of 120. The bigger force is 40N and the resultant is perpendicular to the

smaller one. The smaller force is 20 N

68. If a body is acted upon by a number of coplaner non-concurrent forces, it may

be completely at rest,

rotate about itself without moving

move in any one direction rotating about itself

all of these

69. The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is D/d.

70. The slope on the road surface generally provided on the curves is known as angle of banking

71. A number of forces acting at a point will be in equilibrium, if sum of resolved parts in the vertical direction is zero (i.e. V = 0)

72. The centre of gravity a T-section 100 mm x 150 mm x 50 mm from its bottom is 87.5 mm

73. Joule is the unit of work.

74. The efficiency of a lifting machine is the ratio of

work done by the machine to the work done on the machine

output to the input

mechanical advantage to the velocity ratio

75. The acceleration of a body sliding down an inclined surface is g sin

76. The forces, whose lines of action are parallel to each other and act in the same directions, are known as like parallel forces

77. A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act zero at its upper end

78. The unit of angular velocity is both rad/s and revolutions/min

2.Strength of Material

1. The slenderness ratio of a vertical column of a square cross-section of 2.5 cm sides and 300 cm length, is 416

2. In a loaded beam, the point of con-traflexture occurs at a section where bending moment is zero or changes sign

3. For a simply supported beam with a central load, the bending moment is maximum at the centre.

4. The ratio of the maximum deflections of a beam simply supported at its ends with an isolated central load and that of with a uniformly distributed load over its entire length, is 2/3

5. As compared to uniaxial tension or compression, the strain energy stored in bending is only 1/3

6. The ratio of elongations of a conical bar due to its own weight and that of a prismatic bar of the same length, is 1/3.

7. The shape of the bending moment diagram over the length of a beam, carrying a uniformly distributed load is always parabolic

8. A beam of length L is pinned at both ends and is subjected to a concentrated bending couple of moment M at its centre. The maximum bending moment in the beam is M

9. If the shear force along a section of a beam is zero, the bending moment at the section is maximum

10. The ratio of the moment of inertia of a circular plate and that of a square plate for equal depth, is equal to 3/16

11. The weakest section of a diamond riveting, is the section which passes through first row.

12. A three-hinged arch is said to be : statically determinate structure

13. The shape of the bending moment diagram over the length of a beam, having no external load, is always Linear

14. The maximum twisting moment a shaft can resist, is the product of the permissible shear stress and polar modulus

15. If two forces acting at a joint are not along the straight line, then for the equilibrium of the joint each force must be zero

16. Pick up the incorrect statement Welding takes more time than riveting.

17. The minimum number of rivets for the connection of a gusset plate, is 2

18. If the width of a simply supported beam carrying an isolated load at its centre is doubled, the deflection of the beam at the centre is changed by 1/2

19. The deflection of any rectangular beam simply supported, is inversely proportional to the cube of its depth

20. The ratio of strengths of solid to hollow shafts, both having outside diameter D and hollow having inside diameter D/2, in torsion, is 15/16

21. If the rivets in adjacent rows are staggered and outermost row has only one rivet, the arrangement of the rivets, is called diamond riveting

22. If a three hinged parabolic arch carries a uniformly distributed load on its entire span, every section of the arch resists. compressive force

23. When loads are applied proportionately to a frame structure containing its members in one plane, the structure is called space frame

24. The shear stress at any section of a shaft is maximum at the top of the surface

25. A three hinged parabolic arch hinged at the crown and springings, has a horizontal span of 4.8 m and a central rise of 1 m. It carries a uniformly distributed load of 0.75 tonne per metre over half left hand

span. The horizontal thrust at the support will be 1.08 tonnes

26. Pick up the correct statement from the following :

A ductile material has large plastic zone

A brittle material has no plastic zone

A rigid material has no plastic zone.

27. A simply supported beam carrying a uniformly distributed load over its whole span, is propped at the centre of the span so that the beam is held to the level of the end supports. The reaction of the prop

will be 5/8th the distributed load

28. The maximum bending moment due to a moving load on a simply supported beam, occurs under the load

29. Influence lines are drawn for structures

o 1. pin-jointed truss

o 2. none of these.----correct

o 3. of any type

o 4. statically determinate

30. A reinforced concrete beam is assumed to be made of heterogeneous material

31. A beam is said to be of uniform strength, if bending stress is same throughout the beam

32. The number of points of contraflexure in a simple supported beam carrying uniformly distributed load, is 0

33. The length of a column, having a uniform circular cross-section of 7.5 cm diameter and whose ends are hinged, is 5 m. If the value of E for the material is 2100 tonnes/cm2, the permissible maximum

crippling load will be 12.88

34. In a beam, the neutral plane does not change during deformation

35. The range within which a load can be applied on a rectangular column, to avoid any tensile stress, is one-fifth of the base

36. The region of the cross-section of a column in which compressive load may be applied without producing any tensile stress, is known as the core of the cross-section. In circular columns the radius

of the core, is one-quarter of the radius

37. In a three hinged arch, the shear force is usually maximum at springings

38. The law which states, within elastic limits strain produced is proportional to the stress producing it, is known as Hooke's law

39. An arch may be subjected to bending moment and shear force

40. The rise of a parabolic arch at quarter points, is equal to 3/4 times the rise of the crown

41. For a beam having fixed ends, the unknown element of the reactions, is horizontal and vertical components at both the ends.

42. The areas of cross-section of a square beam and a circular beam subjected to equal bending moments, are same. square beam is more economical

43. The moment diagram for a cantilever carrying linearly varying load from zero at its free end and to maximum at the fixed end will be a cubic parabola.

44. A cast iron T section beam is subjected to pure bending. For maximum compressive stress to be three times the maximum tensile stress, centre of gravity of the section from flange side is h/4

45. When two plates butt together and are riveted with two cover plates with two rows of rivets, the joint is known as double riveted double cover butt joint.

46. For a beam, if fundamental equations of statics are not sufficient to determine all the reactive forces at the supports, the structure is said to be statically indeterminate

47. A column is said to be of medium size if its slenderness ratio is between 32 and 120

48. The value of Poissons ratio always remains less than one

49. If the length of a cantilever carrying an isolated load at its free end is doubled, the deflection of the free end will increase by 1/8

50. The stress necessary to initiate yielding, is considerably more than that necessary to continue it

51. For the same height, the bottom width for no tension, for triangular section is same as that of a rectangular section

52. The bending moment is maximum on a section where shearing force changes sign.

53. Ties are load carrying members of a frame, which are subjected to axial tension loads

54. The phenomenon of slow growth of strain under a steady tensile stress, is called as creeping

55. Strain energy of any member may be defined as work done on it to deform it, to resist elongation & to resist shortening

56. The moment diagram for a cantilever which is subjected to a uniformly distributed load will be a parabola

57. If the depth of a simply supported beam carrying an isolated load at its centre, is doubled, the deflection of the beam at the centre will be changed by a factor of 1/8

58. The effect of arching a beam, is to reduce the bending moment throughout

59. For keeping the stress wholly compressive the load may be applied on a circular column anywhere within a concentric circle of diameter d/4

60. The following assumption is not true in the theory of pure torsion : All radii get twisted due to torsion.

61. The ratio of the effective length of a column and minimum radius of gyration of its cross-sectional area, is known slenderness ratio

62. The under mentioned type is simple strain --tensile strain, compressive strain & shear strain

63. Pick up the correct assumption of the theory of simple bending

The resultant pull or thrust on transverse section of a beam is zero,

The material of the beam is homogeneous and isotropic,

Transverse section of a beam remains plane before and after bending

64. When a rectangular beam is loaded transversely, the maximum tensile stress develops on top fibre

65. When a rectangular beam is loaded transversely, the maximum compressive stress is developed on

the bottom layer

66. The neutral axis of a beam cross-section must pass through the centroid of the section

67. Shear force for a cantilever carrying a uniformly distributed load over its length, is rectangle

68. Reactions at the supports of a structure can be determined by equating the algebraic sum of horizontal

forces to zero, vertical forces to zero.

69. To ascertain the maximum permissible eccentricity of loads on circular columns, the rule generally

followed, is middle fourth rule of columns

70. A short masonry pillar is 60 cm x 60 cm in cross-section, the core of the pillar is a square whose side

is 14.14 cm

71. Beams of uniform strength are preferred to those of uniform section because these are economical for large spans

72. A member is balanced at its end by two inclined members carrying equal forces. For equilibrium the

angle between the inclined bars must be 120

73. A rectangular log of wood is floating in water with a load of 100 N at its centre. The maximum shear

force in the wooden log is 100 N at the centre

74. A three hinged arch is loaded with an isolated load 1000 kg at a horizontal distance of 2.5 m from the

crown, 1 m above the level of hinges at the supports 10 metres apart. The horizontal thrust is 1250 kg

75. For a stable frame structure, number of members required, is twice the number of joints minus three

76. In a solid arch, shear force acts perpendicular to the axis of arch

77. moment diagram for a cantilever whose free end is subjected to a bending moment, will be a rectangle

78. In a continuous bending moment curve the point where it changes sign, is called point of inflexion / point of virtual hinge or point of contraflexture

79. Failure of riverted joints is due to Shearing of rivets, tearing of plates between rivets & Crushing of rivets.

80. The object of caulking in a riveted joint is to make the joint leak proof

81. Eulers formula holds good only for long columns

82. When shear force at a point is zero, then bending moment is maximum_ at that point.

83. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600

MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the

same planes. The maximum normal stress will be 1000 MPa

84. Two closely coiled helical springs A and B are equal in all respects but the number of turns of spring A is half that of spring B The ratio of deflections in spring A to spring B is

85. The stress induced in a body, when suddenly loaded, is twice the stress induced when the same load

is applied gradually.

86. A masonry dam may fail due to overturning of the dam & tension in the masonry of the dam and its base

87. The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th

of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate) 4t

88. When a bar is cooled to 5C, it will develop tensile stress

89. The neutral axis of the cross-section a beam is that axis at which the bending stress is zero

90. The energy stored in a body when strained within elastic limit is known as strain energy

91. Strain resetters are used to measure linear strain

92. The simply supported beam A of length l carries a central point load W. Another beam B is loaded with a uniformly distributed load such that the total load on the beam is W. The ratio of maximum

deflections between beams A and B is 8/5

93. The maximum stress produced in a bar of tapering section is at smaller end

94. A steel bar of 5 mm is heated from 15 C to 40 C and it is free to expand. The bar will induce no stress

95. In compression test, the fracture in cast iron specimen would occur along an oblique plane

96. When a thin cylindrical shell is subjected to an internal pressure, there will be an increase in diameter and length of the shell

97. The stress at which the extension of the material takes place more quickly as compared to the increase

in load, is called yield point

98. The rectangular beam A has length l, width b and depth d. Another beam B has the same length and depth but width is double that of A. The elastic strength of beam B will be _double_ as compared to beam A.

99. The rectangular beam A has length l, width b and depth d. Another beam B has the same length and width but depth is double that of A. The elastic strength of beam B will be four times _ as compared to beam A.

100. The point of contraflexure occurs in overhanging beams

101. In a simple bending of beams, the stress in the beam varies linearly

102. The extremeties of any diameter on Mohrs circle represent normal stresses on planes at 45

103. Rivets are generally specified by shank diameter

104. In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This

assumption means that the elastic constants are same in all the directions

105. The Poissons ratio for cast iron varies from 0.25 to 0.33 (0.26)

106. Compression members always tend to buckle in the direction of the least radius of gyration

107. A thin spherical shell of diameter (d) and thickness (t) is subjected to an internal pressure (p). The

stress in the shell material is pd/2t

108. If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets

is 0.50

109. The strain energy stored in a spring, when subjected to maximum load, without suffering permanent

distortion, is known as proof resilience

110. The ratio of change in volume to the original volume is called volumetric strain

111. When a closely-coiled helical spring is subjected to an axial load, it is said to be under torsion

112. When two shafts of same length, one of which is hollow, transmit equal torques and have equal

maximum stress, then they should have equal polar modulus

113. When a cantilever beam is loaded at its free end, the maximum compressive stress shall develop at bottom fibre

114. When a body is subjected to a direct tensile stress () in one plane, the maximum shear stress is _ one-half _ the maximum normal stress.

115. The slenderness ratio is the ratio of length of column to least radius of gyration

116. The elongation of a conical bar under its own weight is __ one-third _ that of prismatic bar of the same

length.

117. A simply supported beam A of length l, breadth b and depth d carries a central load W. Another beam B of the same dimensions carries a central load equal to 2 W. The deflection of beam B will be double _ as that of beam A.

118. A column with maximum equivalent length has one end fixed and the other end free

119. When the shear force diagram is a parabolic curve between two points, it indicates that there is a uniformly varying load between the two points

120. The shear force and bending moment are zero at the free end of a cantilever beam, if it carries a uniformly distributed load over the whole length

121. The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e.

radius of shaft) is known as twisting moment

122. The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per

unit length, consists of two right angled triangles

123. A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is

subjected to a compressive load, then both rod and tube are under compression

124. The total strain energy stored in a body is termed as resilience

125. A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and

nuts. If the nut is tightened, then bolt is Under tension and tube is under compression

126. The maximum deflection of a fixed beam carrying a central point load lies at centre of beam

127. In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at

least __ 1.5 times _ the total water pressure per metre length.

128. The ratio of the largest load in a test to the original cross-sectional area of the test piece is called ultimate stress

129. A beam of T-section is subjected to a shear force of F. The maximum shear force will occur at the neutral axis of the section

130. When a beam is subjected to a bending moment, the strain in a layer is _ directly proportional to __ the

distance from the neutral axis.

131. The design of thin cylindrical shells is based on hoop stress

132. The shear force diagram fora cantilever beam of length l and carrying a gradually varying load from

zero at free end and w per unit length at the fixed end is a parabolic curve

133. When one plate overlaps the other and the two plates are riveted together with two rows of rivets, the

joint is known as double riveted lap joint

134. A beam of uniform strength may be obtained by keeping the width uniform and varying the depth , keeping the depth uniform and varying the width

135. The springs in brakes and clutches are used to to apply forces

3.Workshop Technology

1. A zinc diffusion process is called sheradising

2. The property of sand due to which it evolves a great amount of steam and other gases is called permeability

3. The chisel used for cutting key ways is cape chisel

4. The cold chisels are made by forging

5. TIG welding process uses non-consumable electrodes.

6. In arc welding, the electric arc is produced between the work and the electrode by contact resistance

7. The fullers are used for necking down a piece of work

8. The algebraic difference between the minimum limit and the basic size is called lower deviation

9. In welding copper alloys with TIG arc welding direct current with straight polarity is used

10. In sheet metal blanking, shear is provided on punches and dies so that press load is reduced

11. A taper provided on the pattern for its easy and clean withdrawl from the mould is known as draft allowance

12. Thread rolling is restricted to ductile materials

13. The temperature at which the new grains are formed in the metal is called recrystallisation temperature

14. The draft or taper allowance on casting is generally 1 to 2 mm/m

15. In a hot chamber die casting machine non-ferrous alloys with high melting temperature are casted

16. The type of file used for a wood work is rasp-cut file

17. In a bilateral system of tolerance, the tolerance is allowed on both sides of the nominal size

18. The accuracy of micrometers, calipers, dial indicators can be checked by a slip gauge

19. Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes? Extrusion and rolling

20. The purpose of a riser is to feed the molten metal to the casting in order to compensate for the shrinkage

21. In a centrifugal casting method no core is used

22. The cross-section of a chisel is usually octagonal

23. The blank diameter used in thread rolling will be a little larger than the minor diameter of the thread

24. Blanking and piercing operations can be performed simultaneously in a compound die

25. In a four high rolling mill, there are four rolls out of which two are working rolls and two are backing up rolls

26. For obtaining a cup of diameter 25 mm and height 15 mm by drawing, the size of the round blank should be approximately 46 mm

27. The instrument which has all the features of try-square, bevel protractor, rule and scriber, is combination set

28. In back-hand welding, the angle between the welding torch and the work is kept as 50-60

29. A pattern makers shrinkage rule considers only shrinkage allowance

30. A two high rolling mill consists of two rolls which rotate at the same speed but in opposite direction

31. The electrodes used in spot welding have a tip of copper

32. When a hole or cavity to be cored is not in line with the parting surface, then a _drop core_ is used.

33. Metal patterns are used for large scale production of castings

34. The tolerance produced by shell moulding process of casting is 0.2 mm

35. Cores are used to improve mould surface, form a part of a green sand mould, form internal cavities in the casting

36. In shielded arc welding welding rod coated with fluxing material is used

37. Galvanising is a process of coating zinc by hot dipping

38. In submerged arc welding, an arc is produced between a bare metal electrode and the work

39. In a unilateral system of tolerance, the tolerance is allowed on one side of the nominal size

40. In average work, the tolerance produced by investment casting method is 0.05 mm

41. The machining allowance provided on patterns depends upon method of casting used , type of casting metal and

size and shape of casting

42. Carburising flame is used to weld hard surfacing materials such as satellite

43. The centrifugal casting method, is used for casting articles of symmetrical shape about horizontal axis

44. In a compound die two or more cutting operations are performed at one station of the press in every stroke of the

ram

45. Notching is the operation of removal of metal to the desired shape from the edge of a plate

46. Lancing is the operation of cutting a sheet of metal through part of its length and then bending the cut portion

47. A file removes the metal during forward stroke

48. The operation of straightening a curved sheet metal, is known as planishing

49. In order to cut mild steel, the cutting angle of chisel should be 60

50. In a _ combination die _ , both cutting and non-cutting operations are performed at one station of the press in

every stroke of the ram.

51. The shrinkage allowance for cast iron pattern is 10 mm/m

52. The cold working of metals is carried out below the recrystallisation temperature

53. A neutral flame is obtained by supplying equal volumes of oxygen and acetylene

54. During hot working of metals close tolerances can not be maintained, scale is formed on the metal surface &

poor surface finish is produced

55. In spot welding, the spacing between two spot weld should not be less than 3d

56. In sheet metal work, he cutting force on the tool can be reduced by grinding the cutting edges sharp

57. For welding plates of thickness less than 5 mm, its edges do not require beveling

58. Aluminium is the best material for making patterns because it is light in weight, easy to work & corrosion

resistant

59. Tandem drawing of wires and tubes is necessary because annealing is needed between stages

60. An oxidising process used for aluminium and magnesium articles is called anodizing

61. A jolt machine is used to am the sand harder at the pattern face with decreasing hardness towards the back of the

mould

62. In a _ progressive die_ , two or more operations are performed simultaneously at the single stroke of the ram.

63. The current in electric resistance welding can be regulated by changing the primary turns of the transformer

64. Rotary swaging is used for reducing the diameters of round bars and tubes by rotating dies which open and close

rapidly on the work

65. Most of the oxy-acetylene welding is done with neutral flame

66. A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as sand

wash

67. For cutting brass, the hacksaw blade should have _ 14_ teeth per 25 mm.

68. To prevent the body of the blade from jamming in the saw cut, the teeth of blade are set

69. A ring gauge is used to check the diameter of shafts or studs

70. Structural sections such as rails, angles, I-beams are made by hot rolling

71. A rip saw is used for cutting along the grains of wood

72. In a cold chamber die casting machine melting pot is separate from the machine

73. The teeth of hacksaw blade are bent alternately towards right and left and every third or fourth left straight

74. The cold chisels are made from cast tool steel

75. The casting method adopted for ornaments and toys of non-ferrous alloys, is slush casting

76. For welding plates of thickness more than 12.5 mm, its edges should have a double-V or U-groove on both sides

77. A casting defect which results in general enlargement of a casting is known as swell

78. A mortise gauge is a marking tool

79. In electric resistance welding, voltage required for heating is 6 to 10 volts

80. The cutting edge of a chisel should be hardened and tempered

81. Cutting and forming operations can be performed in a single operation in a combination die

4.PRODUCTION TECHNOLOGY

1. Side rake angle of a single point cutting tool is the angle by which the face of the tool is inclined sideways

2. A push broach as compared to pull broach has less number of teeth, Removes less material for each pass of the tool & is short and stocky

3. The tool made of cemented carbide wear out faster at slow speeds

4. The work or surface speed for cylindrical grinding varies from 20 to 30 m/min

5. In centreless grinding, the surface speed of regulating wheel is 15 to 60 m/min

6. A twist drill is an end cutting tool

7. The cutting tool in a milling machine is mounted on arbor

8. Drilling is an example of oblique cutting

9. The silicon carbide abrasive is chiefly used for grinding ceramic, cemented carbide & cast iron.

10. The method of grinding used to produce a straight or tapered surface on a workpiece is external cylindrical grinding

11. If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is conical locator

12. The average cutting speed for turning brass with a high speed steel tool is 60 to 90 m/min

13. Segmental chips are formed during machining cast iron

14. Cast iron during machining produces discontinuous chips

15. The lip angle of a single point tool is usually 60 to 80

16. A single point thread cutting tool should ideally have zero rake angle

17. When the cutting edge of the tool is dull, then during machining continuous chips with built-up edge are formed

18. Gear lapping is an operation after heat treatment

19. The maximum production of small and slender parts is done by multispindle automatic lathe

20. Crater wear occurs mainly on the face of the cutting tool at a short distance from the cutting edge only

21. Internal gears can be made by shaping with pinion cutter

22. High speed steel drills can be operated at about _double_ the speed of high carbon steel drills.

23. In machining metals, chips break due to _work hardening_ of work material.

24. A left hand tool on a lathe cuts most efficiently when it travels from left to right end of the lathe bed

25. The correct sequence of tool materials in increasing order of their ability to retain their hot hardness is cermet, carbide, ceramic, borazon

26. For softer materials, the point angle of the drill is kept less than 118

27. Grinding wheels should be tested for balance occasionally

28. The lathe spindles are usually made hollow and provided with internal taper

29. In hot machining, tool is made of tungsten carbide

30. The facing is an operation of machining the ends of a workpiece to produce a flat surface square with the axis

31. The machining of titanium is difficult due to low tool-chip contact area

32. Lapping is an operation of sizing and finishing a small diameter hole

33. Which of the following parameters influence the axial feed rate in centreless grinding? Speed of the regulating

wheel, Angle between the axis of grinding and regulating wheels & Regulating wheel diameter.

34. The different spindle speeds on a lathe form geometrical progression

35. In up milling, the thickness of chip is minimum at the beginning of the cut and maximum at the end of the cut

36. The example of snag grinding is trimming the surface left by sprues and risers on castings, removing flash on

forgings & grinding the parting line left on castings.

37. The snag grinding is done to remove considerable amount of metal without regard to accuracy of the finished

surface

38. The rear teeth of a broach remove maximum metal

39. The lead screw of a lathe has _ single start _ threads.

40. In ultra-sonic machining, the metal is removed by using abrasive slurry between the tool and work

41. In metal cutting, use of low feeds and high cutting speeds is desired when the objective is surface finish

42. In a shaper, the length of stroke is increased by increasing the centre distance of bull gear and crank pin

43. Glazing in grinding wheels can be decreased by using a softer wheel or by decreasing the wheel speed

44. A process of removing metal by pushing or pulling a cutting tool is called broaching 45. Which of the following statement is correct for orthogonal cutting system? The cutting edge of the tool is perpendicular to the direction of tool travel.

The cutting edge clears the width of the workpiece on either ends.

The chip flows over the tool face and the direction of the chip flow velocity is normal to the cutting edge.

46. The method of centreless grinding used to produce taper is endfeed grinding

47. In centreless grinders, the maximum angular adjustment of the regulating wheel is 0 to 10

48. In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is surface grinder

49. The abrasive recommended for grinding materials of high tensile strength is aluminium oxide

50. The angle made by the face of the tool and the plane parallel to the base of cutting tool is called rake angle

51. An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is shear angle

52. The factor responsible for the formation of continuous chips with built up edge is low cutting speed and small rake angle

53. The angle on which the strength of the tool depends is rake angle

54. Larger than 15 side cutting edge angle produces chipping and decreases tool life

55. In metal machining, the work-tool contact zone is a zone where heat is generated due to burnishing friction

56. Crater wear is predominant in tungsten carbide tools

57. Thread grinding requires work speed from 1 to 3 m/min

58. Threading is an operation of cutting helical grooves on the external cylindrical surface

59. Trepanning is an operation of producing a hole by removing metal along the circumference of a hollow cutting tool

60. When the end of a tap is tapered for about three or four threads, it is known as a second tap

61. The cutting speed is minimum while machining _cast iron _ with a high speed steel tool.

62. Following operations can be performed with milling cutters --cutting teeth of spur gears,cutting key ways on shafts & cutting external screw threads

63. In a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is known as end relief angle

64. While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is inter-related to index change gear ratio

65. A set of eight form relieved milling cutters for each module is provided to enable cutting of gears of different number of teeth

66. The type of tool used on lathe, shaper and planer is single point cutting tool

67. The hardness of a grinding wheel is specified by letter of alphabet

68. The guideways are of V-type, flat type & dovetail type.

69. The trade name of a non-ferrous cast alloy composed of cobalt, chromium and tungsten is called stellite

70. In order to grind soft material coarse grained grinding wheel is used

71. The depth of cut in drilling is _ one-half _ the drill diameter.

72. Any number of equal divisions can be obtained on milling machine by simple indexing

73. The type of reamer used for reaming operation in a blind hole, is right hand spiral fluted reamer

74. The velocity of tool along the tool face is known as chip velocity

75. Down milling is also called climb milling

76. The swing diameter over the bed is _ twice _ the height of the centre measured from the bed of the lathe

5.Thermodynamics

Otto cycle is also known as constant volume cycle

In an irreversible process, there is a loss of heat

Those substances which have so far not been resolved by any means into other substances of simpler

form are called elements

Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat

input because in Otto cycle heat rejection is lower

Kelvin-Plancks law deals with conversion of heat into work

For the same compression ratio, the efficiency of dual combustion cycle is greater than Diesel cycle and less than Otto cycle

The specific heat at constant volume is the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

The area under the temperature-entropy curve (T s curve) of any thermodynamic process represents either heat absorbed or heat rejected

The measurement of a thermodynamic property known as temperature is based on Zeroth law of thermodynamics

The compression ratio for Diesel engines is 15 to 20

The efficiency of Diesel cycle depends upon cut-off ratio and compression ratio

Producer gas is obtained by partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

The gas constant (R) is equal to the ____ difference ______ of two specific heats

When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium

with each other. This statement is called Zeroth law of thermodynamics

Coke is produced when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel

For a perfect gas, according to Boyles law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)-- p v = constant, if T is kept constant

A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84

kJ of heat during the process. The change in internal energy of the mixture is 54 kJ

One kg of carbon produces _ 11/3 _ kg of carbon dioxide.

Coal gas is mostly used in town for street and domestic lighting and heating.

The atomic mass of oxygen is 16

The distillation carried out in such a way that the liquid with the lowest boiling point is first

evaporated and recondensed, then the liquid with the next higher boiling point is then

evaporated and recondensed, and so on until all the available liquid fuels are separately

recovered in the sequence of their boiling points. Such a process is called fractional distillation

The efficiency and work ratio of a simple gas turbine cycle are very low

The efficiency of Diesel cycle approaches to Otto cycle efficiency when cut-off is zero

The liquid fuels have higher calorific value than solid fuels.

The compression ratio for petrol engines is 5 to 8

The processes occuring in open system which permit the transfer of mass to and from the system,

are known as flow processes

Workdone in a free expansion process is zero

Absolute pressure = Gauge pressure + Atmospheric pressure

The efficiency of Diesel cycle increases with decrease in cut-off

The pressure exerted by an ideal gas is _ two-third _ of the kinetic energy of all the molecules

contained in a unit volume of gas.

The absolute zero temperature is taken as -273C

One kg of carbon monoxide requires _ 4/7 _ kg of oxygen to produce 11/7 kg of carbon dioxide gas.

Reheating in a gas turbine increases the thermal efficiency

The gas turbine cycle with regenerator improves thermal efficiency

One kg of carbon requires 4/3 kg of oxygen and produces _ 7/3 _ kg of carbon monoxide gas.

The total energy of a molecule is shared equally by the various degrees of freedom possessed by it.

This law is known as law of equipartition of energy

During Isothermal compression process does heat rejection takes place in Carnot cycle.

The specific heat of water is 4.187

The fuel mostly used in steam boilers is non-coking bituminous coal

The hyperbolic pocess is governed by Boyle's law

A series of operations, which takes place in a certain order and restore the initial conditions at the

end, is known as thermodynamic cycle

The entropy of water at 0C is assumed to be 0

The hard coke is obtained when carbonisation of coal is carried out at 900 to 1100C

The natural solid fuel is wood

The state of a substance whose evaporation from its liquid state is complete, is known as perfect gas

The heat and mechanical energies are mutually convertible. This statement was established by Joule

A cycle consisting of _ two constant volume _ and two isothermal processes is known as Stirling cycle.

A triatomic molecule consists of _ three _ atoms.

Mond gas is obtained by passing air and a large amount of steam over waste coal at about 650C

Anthracite coal has the highest calorific value

In open cycle gas turbine plants a condenser is used, direct combustion system is used & the indirect heat exchanger and cooler is avoided

The compression ratio is the ratio of total volume to clearance volume

One molecule of oxygen consists of _ 2 _ atoms of oxygen