multiple choice questions (mcqs)

Faculty of Diploma Studies - 695 Department of Mechanical Engineering - 19

Prepared By:- Prof. Jigar V. Bhalodiya (M.Tech-Thermal) 1

Multiple Choice Questions (MCQs)

Subject: Fabrication Technology (3361905) Semester: 6th

UNIT 1 Introduction 1) Which of the following joint have high corrosion resistance?

a) Welding joint

b) Riveted joint

c) Bolted joint

d) None of the above

Answer: a

2) The metals having good weldability, in descending order are

a) cast steel, iron, carbon steel, cast iron

b) carbon steel, iron, cast steel, cast iron

c) iron, carbon steel, cast steel, cast iron

d) cast iron, iron, carbon steel, cast steel

Answer: a

3) Which of the following is not included in weldability?

a) Ability of mechanical soundness

b) Serviceability of joint

c) Strain relieving brittleness

d) Metallurgical compatibility of metal

Answer: c

4) On which of the following factor, does weldability not depend?

a) Boiling point

b) Melting point

c) Thermal expansion

d) Thermal conductivity

Answer: a

5) Which of the following is not a way of correcting the metal which does not have good

weldability properties?

a) Procedure of welding

b) Provision of fluxing material

c) Provision of filler material

d) Procedure of adding filler materials

Answer: d



6) Which of the following is an example of plastic welding?

a. Gas welding

b. Arc welding

c. Forge welding

d. Thermit welding

Answer: c

7) Which of the following is an example of fusion welding?

a. Arc welding

b. Forge welding

c. Resistance welding

d. Thermit welding with pressure

Answer: a

8) Which of the following welding process is used for welding of sheet metals in automobile

and air craft industries?

a. Shield metal arc welding

b. Gas tungsten arc welding

c. Thermit welding

d. Resistance welding

Answer: d

9) In which of the following process, heat is created by blacksmith fire

a. Forge welding

b. Spot welding

c. Projection welding

d. Seam welding

Answer: a

10) The voltage needed in resistance welding does not depend upon

a. Composition

b. Area

c. Thickness of weld

d. Length of weld

Answer: d

11) In resistance welding, two electrodes are made of

a. Aluminium

b. Copper

c. Iron

d. Bronze

Answer: b



12) Arc welding machine uses only D.C. supply.

a) True

b) False

Answer: b

13) The negative pole of the electrode burns away faster than the positive pole.

a) True

b) False

Answer: b

14) Which of the following is affected by weld contour?

a) Fatigue

b) Creep

c) High pressure property

d) Low pressure property

Answer: a

15) Which of the following materials are not suited for cold welding?

a) Brass

b) Steel

c) Silver

d) Gold

Answer: b

16) Match the following

1. Seam welding 1.rods and pipes of uniform cross section

2. Butt welding 2. Welding satellite tips to tools

3. Percussion welding 3. ERW pipes welding

Which of the following is true?

a) 1-3, 2-2, 3-1

b) 1-3, 2-1, 3-2

c) 1-2, 2-3, 3-1

d) 1-2, 2-1, 3-3

Answer: b

17) What is the capacity of an automatic welding machine?

a) 100 to 200A

b) 300 to 400A

c) 500 to 700A

d) 800 to 3000A

Answer: d



18) What is the capacity of a light manual welding machine?

a) 100 to 200A

b) 300 to 400A

c) 500 to 700A

a) 60 amp to 500 amp

Answer: c

19) What is the efficiency of an A.C. welding transformer?

a) 0.6

b) 0.7

c) 0.8

d) 0.9

Answer: c

20) What is the amount of electric energy required per kg in dc welding operation?

a) 1-4 kWh

b) 3-7 kWh

c) 4-9 kWh

d) 6-10 kWh

Answer: d



V

UNIT 2 Drawing Interpretation

1) The symbol for seam welding is __________

a)

b)

c)

d)

Answer: d

2) The symbol for weld type U butt is __________

a)

b)

c)

d)

Answer: c

3) The symbol for weld type V-butt is _________

a)

b)

c)

d)

Answer: a

4) The symbol for weld type double- butt is ________

a)

b)

c)

d)

Answer: c



u

r

5) The symbol for weld type double U- butt is __________

a)

b)

c)

d)

Answer: b

6) The symbol for weld type Bevel butt is ____________

a)

b)

c)

d)

Answer: a

7) ASTM stands for

a) American Society for Tensile Measurement

b) American Society for Testing Material

c) American Society for Tool Measurement

d) American Society for Tensile Material

Answer: b

rement



UNIT 3 FABRICATION PROCESSES AND SAFETY

1) In which welding the surfaces of two components are subjected to static normal force and

oscillating shear stress?

a) Diffusion welding

b) Thermit welding

c) Laser beam welding

d) Ultrasonic welding

Answer: d

2) Electron beam welding is carried out in?

a) Inert atmosphere

b) Partially filled chamber

c) Vacuum

d) Partially vacuum

Answer: c 3) Laser beam welding is a joining process.

a) fission

b) fusion

c) coherent

d) plastic

Answer: b

4) Which of the following is used to direct laser beam?

a) glass apertures

b) perforated glass sheets

c) flat optical elements

d) electro-magnetic coils

Answer: c 5) Inert gas shielding is generally employed to protect _____

a) laser beam

b) molten puddle of metal

c) filler electrode

d) lenses

Answer: b

6) The lasing material or crystal is excited by _____

a) neon lamps

b) krypton lamps

c) tungsten wire laps

d) CFLs

Answer: b



7) Which of the following does not hold true about laser beam welding?

a) Laser welding cannot be used in case of joints at intricate locations

b) It can produce tiny welds

c) Laser welding can be used for a variety of metal combinations

d) In case of LBW, thin welds on small diameter wires are less susceptible to burn back

Answer: a

8) Laser welds are not influenced by _____

a) electric field

b) magnetic field

c) radio waves

d) ultraviolet rays

Answer: b

9) Which of the following material properties has no effect on laser beam machining?

a) Reflectivity

b) Thermal conductivity

c) Weldability

d) Electrical conductivity

Answer: d

10) In oxy-acetylene welding colour of oxygen cylinder is

a. Red

b. Maroon

c. Black

d. Brown

Answer: c

11) In oxy-acetylene welding colour of oxygen cylinder is

a. Red

b. Maroon

c. Black

d. Brown

Answer: b

12) In arc welding, arc initiation voltage is of the order

a. 20-60V

b. 60-100V

c. 100-140V

d. 140-180V

Answer: b



13) In arc welding, the three elements to be controlled to obtain satisfactory welding

operation are

a. Current, voltage and speed of travel

b. Current, voltage and arc length

c. Current, arc length and speed of travel

d. Voltage, arc length and speed of travel

Answer: a

14) Which welding process is used to join two thick plates in one single pass?

a. Oxy-acetylene welding

b. Gas tungsten arc welding (TIG)

c. Gas metal arc welding (MIG)

d. Electroslag welding

Answer: d

15) The following welding process is used to weld fastener to plates without drilling or punching

holes?

a. Electroslag welding

b. Oxy-acetylene welding

c. Butt welding

d. Stud welding

Answer: d

16) The process which employ an exothermal chemical reaction to develop high temperature

a. Electroslag welding

b. Plasma arc welding

c. Thermit welding

d. Stud welding

Answer: c

17) Which process allows fusion welds of great depth with minimum width?

a. Electron beam welding

b. Ultrasonic welding

c. Plasma arc welding

d. Friction welding

Answer: a 18) The process of carbon arc welding is not used for which of the following material?

a) Copper

b) Bronze

c) Aluminium

d) Iron

Answer: d



19) The distance from the center of arc to the tip of electrode is called what?

a) Arc distance

b) Arc length

c) Arc crater

d) Arc depth

Answer: b

20) What is the length of the arc generally?

a) 1mm – 2mm

b) 2mm – 3mm

c) 3mm – 4mm

d) 4mm – 5mm

Answer: c

21) With an increase in the heat input of arc welding method, how does it affect the welding

speed?

a) Increases

b) Decreases

c) Remains same

d) No relation

Answer: b

22) With an increase in the heat input of arc welding method, how does it affect the required

current?

a) Increases

b) Decreases

c) Remains same

d) No relation Answer: a



UNIT 4 INSPECTION AND TESTING 1) Junction between two work piece and weld face is known as?

a) Throat

b) Toe

c) Root

d) Puddle

Answer: a

2) Portion at which two work piece are at the nearest distance is called as?

a) Throat

b) Toe

c) Root

d) Puddle

Answer: c 3) Which of the following defects occur due to flux employed and electrode coating?

a) Inclusion of slay

b) Inadequate penetration

c) Incomplete fusion

d) Porosity

Answer: a

4) Which of the following defects occur when the deposited metal are not focused at the root of

weld?




d) Porosity

Answer: b

5) Which of the following defects occur when weld metal layer fail to fuse together?




d) Porosity

Answer: c 6) Which of the following defects occur due to the entrapment of gas bubbles by the freezing

dendrites during the cooling of molten pad?




d) Porosity

Answer: d



7) Which of the following defects occur due to melting or burning away of base metal?

a) Under cut

b) Spatter

c) Cracking in weld metal

d) Cold cracking

Answer: a 8) Which of the following defects occur due to scattering of metal around the vicinity of

weld?

a) Under cut

b) Spatter


d) Cold cracking

Answer: b

9) Which of the following defects occur due to incorrect welding techniques?

a) Under cut

b) Hot cracking


d) Cold cracking

Answer: c

10) Which of the following defect is influenced by sulphur and carbon content of weld

metals?

a) Under cut

b) Hot cracking


d) Cold cracking

Answer: b

11) The depth up to which the filler material is mixed up with base metal is called as?

a) Deposition

b) Reinforcement

c) Penetration

d) Fusion depth

Answer: c

12) The raised portion from the parent metal in welding is known as?

a) Deposition

b) Fusion depth

c) Penetration

d) Reinforcement

Answer: d



13) Penetrants of which colour are not used?

a) Red

b) Blue

c) Green

d) Yellow

Answer: a

14) Which of the following defect is not detected by dye penetrant test?

a) Non-metallic inclusions

b) Leaks

c) Cracks

d) Forging defects

Answer: a

15) Which of the following materials can be tested using magnetic particle testing?

a) Brass

b) Steel

c) Bronze

d) Solder

Answer: b

16) Magnetic particles with fluorescent coating are seen under which light?

a) White light

b) Infrared light

c) Black light

d) Ultraviolet light

Answer: d

17) Eddy currents are not used for the measure of which of the following properties?

a) Electrical conductivity

b) Magnetic resistivity

c) Hardness

d) Grain size

Answer: b

18) Eddy current inspection method cannot be detect which of the following defect?

a) Laps

b) Seams

c) Voids

d) Surface crack

Answer: d



19) In which of the following materials, ultrasonic testing cannot be used?

a) Plastics

b) Ceramics

c) Non-ferrous objects

d) Ferrous object

Answer: d

20) Ultrasonic testing is a portable process.

a) True

b) False

Answer: a

21) Charpy test is not a type of impact test.

a) True

b) False

Answer: b

22) Which of the following non destructive testing is used to detect change in composition of

any material?

a) Liquid penetration test

b) Ultrasonic test

c) Eddy current test

d) Radiography

Answer: d



UNIT 5 SURFACE PREPARATION, FINISHING AND COATING METHODS

1) Which of the following is not a type of protective coating?

a) Metallic

b) Non-metallic

c) Organic

d) Inorganic

Answer: b

2) An example of an anodic coating is _____

a) Zinc

b) Copper

c) Nickel

d) Chromium

Answer: a

3) Which common application do anodizing and galvanizing serve?

a) Corrosion resistance

b) Improved surface

c) Zinc coating

d) Increased strength

Answer: a

4) Which of the following is/are surface preparation methods?

a) sand blasting

b) ball blasting

c) both

d) none

Answer: c

5) Which of the following is/are surface finishing methods?

a) grinding

b) brushing

c) both

d) none

Answer: c



Unit 6: Installation, Erection and Commissioning.

1) Which of the following is/are surface fabricated structures?

a) bridge

b) pressure vessels

c) both

d) none

Answer: c

2) The process of filling the slurry between the base of machine bed plate and foundation is

known as

a) filling

b) pouring

c) fixing

d) grouting

Answer: d

multiple choice questions (mcqs)

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