elements in machine design (j.t.) module 6

7/28/2019 Elements in Machine Design (j.t.) Module 6

1/6

1

ELEMENTS IN MACHINE DESIGN (J.T.) MODULE 6

1. For acceptable ideal range of tightness which may resultfrom the application of specific combination of

allowances and tolerances:

a. Allowance limitb. Tolerance limitc. Interferenced. Fit

2. A radian is equal to _____.a. 57.02ob. 57.706oc. 57.296od. 57.190o

3. A material having a high electrical resistance and shouldnot be used for conductor of electric current.

a. Alloyed magnesiumb. Silicon base alloyc. Nickeld. Zinc

4. The product of the mass and the linear velocity of thebody:

a. Linear impulseb. Couplec. Linear momentumd. Vector

5. The recommended center distance of sprockets shouldnot less than ____ times the diameter of bigger sprocket.

a. 1.75b. 2c. 1 d. 2

6. The absolute viscosity of the fluid divided by its densityexpressed in the same terms of units is also called ____.

a. Centistokesb. Kinematic viscosityc. Petroffs equationd. Light petroleum oil

7. It improves red hardness of steel:a. Siliconb. Leadc. Cobaltd. Manganese

8. It is required that pipes bigger than ___ mm should notbe screwed but flanged.

a. 76.2b. 63.5c. 2 inchd. 68.5

9. Formed by the intersection by the adjacent flanks ofadjacent threads when extended is called.

a. Crest apexb. All of thesec. Sharp rootd. Sharp crest

10. In designing the spoke or wheel arm of a flywheel, it isideal to consider that the cross-sectional area of the

spoke at rim side should not be less than ___ of the cross

area at the hub side.

a. 80%b. 1/3c. 90%d. 3/8

11. The cutting up to 70% is best for drilling extremely hardmetals and for soft materials ___ degrees may beapplied.

a. 60b. 45c. 40d. 48

12. Single force which produces the same effect upon a massreplacing two or more forces acting together is called:

a. Vectorb. Resultantc. Components of forcesd. Resolution

13.____ is the process necessary to reduce the brittlenesin alloy steel.

a. Martemperingb. Carburizingc. Normalizingd. Tempering

14. The welded joints permit placing the added metal exactlywhere needed and produce an integral structure which

can develop ____% efficiency on any thickness section

especially for mild metal materials.

a. 95%b. 85%c. 100%d. 90%15. The lack of backlash in a spur gear design/operation mayresult to ____.

a. Overloadingb. Jammingc. All of thesed. Overheating

16.____ forces means when their lines of action can beextended to meet to one point.

a. Concurrentb. Centroidsc. Collineard. Resultants

17. Percentage of cut on the return stroke of hacksaw bladeis ___.

a. 2%b. 3%c. 1%d. 0%

18. Imaginary formed by the intersection of the flanks of athread when extended is called ___.

a. Sharp crest


2/6

2

b. Sharp rootc. Root apexd. All of these

19. Permissible variation of the manufactured/machineddimension is called:

a. Intolerable fitsb. Deviationc. Allowanced. Tolerance

20. Molybdenum-chromium-nickel steel designation:a. SAE 48xxb. SAE 43xxc. SAE 56xxd. SAE 46xx

21.____ is also called strain hardening.a. Work hardeningb. Quenchingc. Annealingd. Normalizing

22. A major alloy in tool steel.a. Crb. FeNc. Cobaltd. Mn

23. Distance measured perpendicular to the axis betweenthe cress of the thread and the root of its mating thread

in a thread assembly of screws.

a. Tolerance classb. Crest truncationc. Crest clearanced. Tolerance limit

24. Bearing surface that completely surroundsa. Offset bearingb. Full bearingc. Centrally loaded bearingd. Babbitt bearing

25. The width of a tooth space exceeds the thickness of eachof the engaging tooth on the pitch circle.

a. Allowanceb. Bottom landc. Top landd. Backlash

26.___ addition imparts resistance to atmospheric corrosionin steel, etc.

a. Aluminium bronzeb. Manganesec. Copperd. Bronze

27. Should two equal and opposite collinear forces is addedto the forces already in equilibrium, which of the

statement is true?

a. Unbalanced of moment is maintainedb. Equilibrium is disturbedc. Equilibrium is maintainedd. It creates an unbalanced situation

28. Iron base alloy containing 9-16% chromium.

a. Mn Hadfield steelb. Chrome-moly steelc. Stainless steeld. High chrome steel

29. A rule of thumb, the speed limit of flywheel rim, speedshould be 6000 fpm for cast iron material and for cast

steel flywheel rim at ____ fpm.

a. 3050b. 4500c. 7000d. 10000

30. The distance between rivet centers nearest each other inadjacent rows is called ____.

a. Pitchb. Back pitchc. Margind. Diagonal pitch

31. The purpose of lubrication is mentioned EXCEPT.a. To lighten the loadb. Prevent corrosion/adhesionc. Prevent adhesiond. Cool the moving elements

32. The process of peening the joint portion immediatelyafter the welding greatly improves the fusion structures

avoids possible cracking, avoids possible distorsion, etc

Peening can also ___ process at the same time.

a. Temperingb. Martemperingc. Normalizingd. Annealing

33. Resultant of two or more components forces is alsocalled ____.

a. Component of forcesb. Resultantc. Componentd. Collinear forces

34. For stable equipment foundation, the total combinedengine, driven equipment and foundation center o

gravity must be kept below the foundation to tha

usually about ____ times the usual total combined

weight of the machinery it is supposed to support.

a. 3 to 4b. 3 to 7c. 2 to 4d. 3 to 5

35. All associated with standard materials specificationEXCEPT:

a. American Iron and Steel Instituteb. Souteast Asia Iron and Steel Institutec. Society of Automotive Engineersd. American Society for Testing Materials

36. It is ideal for maximum quietness in sprocket driveoperation to choose ___ or more teeth.

a. 24b. 18c. 27


3/6

3

d. 2137. Shafting up to 3 inches in diameter of cold rolled steel is

___.

a. 4 inchesb. 6 7/8 inchesc. 6 inchesd. 5 inches

38. Designated pipe color used in communication:a. Silver grayb. Aluminium grayc. Bared. White

39. Not part and in fact should not be used in the steelmelting process.

a. Cokeb. Siliconc. Zincd. Aluminium

40. It is rigid piece which serves to transmit force from apiece to another piece or to cause/control motion.

a. Followerb. Crankc. Cam motiond. Link

41. Type of bolt commonly used in the construction that isthreaded in both ends.

a. Stud boltb. Acme threadc. Hex boltd. Square threaded bolts

42. Ten normal helix angles in helical gears is recommendedin the range of ___ degrees.

a. Less than 18b. 20 to 35c. 15 to 25d. 20 to 30

43. The ratio of stress acting on an elastic substance to thedecrease in volume per unit volume.

a. Bulk modulusb. Modulus of resiliencec. Elastic limitd. Modulus of elasticity

44. Rule of thumb in calculating the equipment foundationmass should be ___ times the weight of the machinery it

is supposed to support.

a. 3 5b. 3 6c. 3 9d. 2 - 4

45. The strength of non-ferrous alloys is at maximum atroom temperature while that of ferrous metal has a

maximum strength at ___ F.

a. 400b. 1200c. 450d. 350

46. The welding made along the edges of two parallel platesis called ___.

a. Groove jointb. Fillet jointc. Edge jointd. Corner joint

47. Class of material exhibiting decreased electricaconductivity with increasing temperature.

a. Aluminiumb. P-type semiconductorsc. Metalsd. N-type semiconductors

48. Cast iron flywheels are commonly designed with a factoof safety of:

a. 10 to 13b. 10 to 12c. 10 to 14d. 8 to 13

49. Stress relieving also ___ for the purpose of reducing theinternal stresses of steel material/metal.

a. Temperingb. Normalizingc. All of thesed. Annealing

50. A ridge of uniform section in the form of a helix cutaround the circumference of a cylinder and advancing

along the axis.

a. Thread rootsb. Helix threadc. Screw threadsd. Chamfers

51. Martensite (stainless steel) contains 4 to 26% Cr and amaximum of ___ % nickel.

a. 2.5b. 3.25c. 3.5d. 2.0

52. The design of stress and factor of safety are related inthe following manner:

a. Design stress = ultimate stress/factor of safetyb. Ultimate stress = factor of safety/design stress plus

concentration factor

c. Factor of safety = design stress/ultimate stressd. Design stress = factor of safety time stress

concentration factor

53. The material that can cut/wear hardest substancesubjected to:

a. Carbideb. Abrasivec. Tungstend. Vanadium

54. The resulting force that replace two or more forcesacting together.

a. Vectorb. Couplec. Resultant


4/6

4

d. Equilibrant55. Peculiar strength of the metal to resist being crushed.

a. Shear strengthb. Ultimate strengthc. Compressive strengthd. Elastic limit

56. Which of the following is not a viscoelastic material?a. Teflonb. Plasticc. All of thesed. Metal

57. Alloy steel used in manufacturing bolts, studs, tubingssubjected to torsional stresses.

a. AISI 3141b. AISI 2330c. AISI 4830d. AISI 4310

58. Method of finishing/shaping a machine part ofexceptionally high carbon or high chromium steel parts

(or very hard material)

a. Using oxygen lancingb. Machining using carbide insertc. Using abrasive grindingd. Machining with high speed tool steel

59. In a chain drive design for large speed reduction it ispreferable to use a double reduction or compound type

of transmission instead of single two sprockets

transmission. Drives should be so designed that the

angle between two tight chain strands does not exceed

___ degrees.

a. 45b. 60c. 55d. 90

60. Steel springs are made of high carbon steel, heat treatedand/or cold worked to a high elastic limit to get goodelastic deflection. In general the carbon content is at ___.

a. 0.40% or moreb. 0.65% or morec. 0.50% or mored. 0.66% or more

61. The surface along the fillet curves or between the filletradius of the two adjacent tooth of a gear.

a. Bottom landb. Flankc. Filletd. Top land

62. Not adaptable to welding due to low tensile strength andpoor ductility, etc.

a. Copper partsb. Cast iron materialsc. Aluminum partsd. Bronze parts

63. Plus or minus tolerance can also be called as ____.a. Total toleranceb. Unilateral tolerance

c. Bilaterald. Allowance

64. The total machinery weight plus the foundation weightshould be well distributed in the corresponding soil area

which is enough to cause a bearing stress within the safe

bearing capacity of the soil with a factor of safety of ___.

a. 4.5b. 3c. 4.2d. 5.0

65.___ is a plane perpendicular to the axial plane and to thepitch plane. In gears the parallel axes, and the plane o

rotation coincide.

a. Tangent planeb. Straight planec. Transverse planed. Reference plane

66. The stress in an elastic material is:a. Inversely proportional to the materials yield strengthb. Inversely proportional to the force actingc. Proportional to the displacement of the materia

acted upon by the force

d. Inversely proportional to the strain67. The slenderness ratio of a column is generally defined

as the ratio of its:

a. Length of its minimum widthb. Unsupported length to its maximum radius of

gyration

c. Length of its moment of inertiad. Unsupported length to its least radius of gyration

68. The relationship between the extension of a spring andthe force required to produce the extension is:

a. F = mab. F = Nc. F = mV2/Rd. F = kx

69. The linear portion of the stress-strain diagram of steel isknown as the:

a. Modulus of elongationb. Plastic rangec. Irreversible ranged. Elastic range

70. The ratio of the moment of inertia of the cross section ofa beam to the section modulus is:

a. Equal to the radius of gyrationb. Equal to the area of the cross sectionc. A measure of distanced. Dependent on the modulus of elasticity of the beam

material

71. When an air entrainment agent is introduced into aconcrete mix

a. The strength will increaseb. The strength will decreasec. The strength will not be affectedd. The water/cement ratio must be reduced from 10

15%


5/6

5

72. Structural steel elements to torsion develop:a. Tensile strengthb. Compressive stressc. Shearing stressd. Moment

73. The deflection of a beam is:a. Directly proportional to the modulus of elasticity and

moment of inertia

b. Inversely proportional to the modulus of elasticityand length of the beam cube

c. Inversely proportional to the modulus of elasticityand moment of inertia

d. Directly proportional to the load imposed andinversely to the length squared

74. The differential of the shear equation is which of thefollowing?

a. Load on the beamb. Tensile strength of beamc. Bending moment of the beamd. Slope of the elastic curve

75. A vertically loaded beam, fixed at one end and simplysupported at the other is indeterminate to what degree?

a. Firstb. Secondc. Thirdd. Fourth

76. A thin walled pressurized vessel consist a right circularcylinder with flat ends. Mid way between the ends the

stress is greater in what direction?

a. Longitudinalb. Circumferencec. Radiald. At an angle of 45o to the longitudinal

77. The bending moment at a section of a beam is derivedfrom the:a. Sum of the moments of all external forces on one

side of the section.

b. Difference between the moments on one side of thesection and the opposite side

c. Sum of the moments of all external forces on bothsides of the section

d. Sum of the moments of all external forces betweensupports

78. The stress concentration factor:a. Is a ratio of the average stress on a section to the

allowable stress

b. Cannot be evaluated for brittle materialsc. Is the ratio of the areas involved in a sudden change

of cross section

d. Is the ratio of the maximum stress produced in across section to the average stress over the section

79. Poissons ratio is the ratio of the:a. Unit lateral deformation to the unit longitudinal

deformation

b. Unit stress to unit strainc. Elastic limit to the proportional limit

d. Shear strain to compressive strain80. Hookes law for an isotopic homogeneous medium

experiencing one dimensional stress is:

a. Stress = E (strain)b. Strain = E (stress)c. Force (Area) = E (change in length/length)d. Strain energy = E (internal energy)

81. The modulus of rigidity of a steel member is:a. A function of the length and depthb. Defined as the unit shear stress divided by the unit

shear deformation

c. Equal to the modulus of elasticity divided by oneplus Poissons ratio

d. Defined as the length divided by the moment oinertia

82. A thin homogeneous metallic plate containing a hole isheated sufficiently to cause expansion. If the coefficien

of surface expansion is linear, the area of the will:

a. Increase at twice the rate the area of the metaincreases

b. Increase at the same rate as the area of the metaincreases

c. Stay the samed. Decrease at the same rate as the area of the meta

increases

83. The maximum bending moment of a beam simplysupported at both ends and subject to a total load W

uniformly distributed over its length L is expressed by the

formula:

a. WL/8b. WL2/8c. WL/2d. WL2/2

84. The three moment equation may be used to analyze:a. A continuous beamb. A beam loaded at the third pointsc. A step tapered columnd. The three element composite system

85. In a long column (slenderness ratio > 160) which of thefollowing has the greatest influence on its tendency to

buckle under a compressive load.

a. The modulus of elasticity of the materialb. The compressive strength of the materialc. The radius of gyration of the columnd. The length of the column

86. The area of the shear diagram of a beam between anytwo points on the beam is equal to the:

a. Change in shear between the pointsb. Total shear beyond the two pointsc. Average moment between the two pointsd. Change in moment between the two points

87. Poissons ratio is principally used in:a. The determination of capability of a material for

being shaped

b. The determination of capacity of a material forplastic deformation without fracture


6/6

6

c. Stress-strain relationship where stresses areapplied in more than one direction

d. The determination of the modulus of toughness88. Youngs modulus of elasticity for a material can be

calculated indirectly from which of the following

properties of the material?

a. Temperature, coefficient of expansion and dielectricconstant

b. Temperature, coefficient of expansion and specificheat

c. Density and velocity of sound in the materiald. Density and interatomic spacing in the material

89. The linear portion of the stress-strain diagram of steel isknown as the:

a. Modulus of elasticityb. Plastic rangec. Irreversible ranged. Elastic range

90. Modulus of resilience is:a. The same as the modulus of elasticityb. A measure of a materials ability to store strain

energy

c. The reciprocal of the modulus of elasticityd. A measure of the deflection of a member

91. Imperfections within metallic crystal structures maybe allof the following, EXCEPT:

a. Lattice vacancies, or extra interstitial atomsb. Ion pairs missing in ionic crystalsc. Displacement atoms to interstitial sitesd. Linear defects, or slippage dislocations caused by

shear

92. All of the following statements about strain energy arecorrect EXCEPT:

a. It is caused by generation and movement ofdislocations through shear or plastic deformation

b. It results from trapped vacancies in the crystal latticec. It is proportional to the length of dislocation, shear

modulus and shortest distance between equivalent

lattice sites

d. It is less for sites at grain boundaries than forinternal sites within the crystal structure

93. When a metal is cold worked of the following generallyoccur EXCEPT:

a. Recrystallization temperature decreasesb. Ductility decreasesc. Grains become equi-axedd. Tensile strength increases

94. All of the following statements about strain hardeningare correct EXCEPT:

a. Strain hardening strengthens metals, resistance todeformation increases with the amount of strain

present.

b. Strain hardening is relieved during softening,annealing above the recrystallization temperature.

c. Strain hardening is produced by cold working(deformation below the recrystallization

temperature).

d. More strain hardening requires more timetemperature exposure for relief.

95. All of the following processes strengthen metals, EXCEPTa. Annealing above the recrystallization temperature.b. Work hardening by mechanical deformation below

the recrystallization temperature.

c. Heat treatments such as quenching and temperingfor production of a finer microstructure.

d. Increasing the carbon content of low carbon steels.96. Intrinsic silicon becomes extrinsically conductive, with

electrons as majority carriers, when doped with which of

the following?

a. Aluminiumb. Antimonyc. Borond. Germanium

97. Steels can be strengthened by all of the followingEXCEPT:

a. Annealingb. Quenching and temperingc. Work hardeningd. Grain refinement

98. If 1080 steel (0.80 wt. %C) is annealed by very lowcooling from 1000 C (1832 F) to ambient temperature, its

microstructure will consist almost solely of:

a. Austeniteb. Bainitec. Cementited. Pearlite

99. Which of the following is not a method of non-destructive testing of steel castings and forgings?

a. Radiographyb. Magnetic particlec. Ultrasonicd. Chemical analysis

100.Compressive strength of fully cured concrete is mosdirectly related to:

a. Sand-gravel ratiob. Fineness modulusc. Absolute volumed. Water-cement ratio

- End -

elements in machine design (j.t.) module 6

Documents