1) Mechanical working processes are performed on metals
a. to achieve optimum mechanical properties in the metal
b. to improve the mechanical strength of the metal
c. to make metal dense
d. all of the above
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2) Hot working process is the plastic deformation of metal which is carried out
a. at temperature below the recrystallisation temperature
b. at temperature above the recrystallisation temperature
c. at temperature equals to boiling point of water
d. none of the above
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Answer
Explanation
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ANSWER: at temperature above the recrystallisation temperature
Explanation:
No explanation is available for this question!
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3) Which of the following statements are correct for plastic?
1. Plastic is a non-metallic material that can be moulded to any shape
2. Plastic is a natural or synthetic resin
3. Plastic is of organic nature composed of hydrogen, oxygen, carbon and nitrogen
a. only statements 1 and 2 correct, statement 3 is wrong
b. only statements 1 and 3 correct, statement 2 is wrong
c. only statements 2 and 3 correct, statement 1 is wrong
d. all of above statements 1, 2 and 3 are correct
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Answer
Explanation
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ANSWER: all of above statements 1, 2 and 3 are correct
Explanation:
No explanation is available for this question!
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4) The plastics which soften when heat is applied with or without pressure, but requires cooling to set them to shape are called as
a. thermosofting materials
b. thermosetting materials
c. thermoplastic materials
d. thermostatting materials
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5) In resistance electric welding, the current passed through two joining metal pieces is
a. 230 to 440 volts, at a high amperage
b. 230 to 440 volts, at a low amperage
c. 2 to 8 volts, at a high amperage
d. 2 to 8 volts, at a low amperage
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6) As compared to the arc welding, the gas welding takes
a. considerably less time for the metal to heat up
b. considerably more time for the metal to heat up
c. approximately same time for the metal to heat up as arc welding
d. unpredictable
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Answer
Explanation
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ANSWER: considerably more time for the metal to heat up
Explanation:
No explanation is available for this question!
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7) Good surface finish and better dimensional accuracy can be achieved in
a. cold working process
b. hot working process
c. both a. and b.
d. none of the above
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8) Which of the following are the cold working processes?
(1) Forging
(2) Bending
(3) Squeezing
(4) Pipe Welding
(5) Drawing
a. (1), (2) and (3)
b. (2), (3) and (5)
c. (2), (4) and (5)
d. (1), (2), (3) and (5)
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9) The process of joining two pieces of metal with a different fusible metal applied in a molten state is called as
a. welding
b. soldering
c. both a. and b.
d. none of the above
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10) Which of the following statements is/are true for welding process?
a. General welding equipments are very costly
b. Welding results in residual stresses and distortion of workpiece
c. Two dissimilar metals cannot be joined by welding
d. All of the above
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Answer
Explanation
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ANSWER: Welding results in residual stresses and distortion of workpiece
Explanation:
No explanation is available for this question!
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11) Thermosetting materials are
a. the plastics which can be softened even after they have set and hardened
b. the plastics which require heat and pressure to mould them into shape
c. both a. and b.
d. none of the above
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Answer
Explanation
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ANSWER: the plastics which require heat and pressure to mould them into shape
Explanation:
No explanation is available for this question!
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12) Which plastic materials contain strong cross linkings in their molecular structure?
a. Thermoplastic materials
b. Thermosetting materials
c. Both a. and b.
d. None of the above
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13) Worm working or semi-hot working process, which is the plastic deformation of metal or alloy under conditions of temperature and strain rate, is performed to eliminate drawbacks of
a. cold working process
b. hot working process
c. both cold and hot working processes
d. none of the above
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14) The volume of metal that enters the rolling stand
a. should increase after rolling process
b. should decrease after rolling process
c. should remain same after rolling process
d. unpredictable
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15) The metal joined is never brought to a molten stage in
a. pressure welding
b. fusion welding
c. thermit welding
d. none of the above
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16) Which of the following is an example of fusion welding?
a. Atomic hydrogen welding
b. Flash welding
c. Seam welding
d. Spot welding
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17) Which of the following is an example of thermoplastic material?
a. Camera bodies
b. Automobile parts
c. Electric plugs
d. Electric insulation
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18) Which of the following characteristics does not affect the properties of plastics?
a. Their molecular structure
b. Their degree of polymerization
c. Both a. and b
d. None of the above
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19) Consider the following diagram of machining tool. What is the type of the tool shown below?
a. Turning tool
b. Facing tool
c. Chamfering tool
d. Parting or necking tool
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20) Assume a machining process of taper turning. In this process, a large diameter of taper is 'D' and it is uniformly decreased to the small diameter of the taper 'd' at the horizontal length of tapered part of workpiece is 'L'. What is the correct formula for half of tapper angle (2α / 2)?
a. α = sin–1 ((D – d) / 2L)
b. α = cos–1 ((D – d) / 2L)
c. α = tan–1 ((D – d) / 2L)
d. α = cot–1 ((D – d) / 2L)
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21) Calculate time taken to face a workpiece of 100 mm diameter. The cross feed is 0.2 mm/rev and spindle speed is 200 r.p.m.
a. 10 min
b. 5 min
c. 2.5 min
d. 1.25 min
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22) Which of the following is a soft solder?
a. Copper-zinc alloy
b. Nickel-silver alloy
c. Lead-tin alloy
d. All of the above
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23) What is used as joining medium in brazing operation?
a. Copper-zinc alloy
b. Nickel-silver alloy
c. Lead-tin alloy
d. All of the above
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24) Joint strength in brazing operation is
a. as high as in gas or arc welding
b. not as high as in gas or arc welding
c. higher than that of in gas or arc welding
d. unpredictable
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