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1) 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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2) 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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3) 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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4) 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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5) 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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6) 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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7) 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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8) Which characteristic of material is used in forging process? a. characteristics of elasticity of material b. characteristics of ductility of material c. characteristics of plasticity of material d. none of the above
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9) How does the ability of material to withstand unpredictable loads change after forging? a. The ability of material to withstand unpredictable loads increases after forging b. The ability of material to withstand unpredictable loads decreases after forging c. The ability of material to withstand unpredictable loads does not change after forging d. Unpredictable
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10) Specific gravity of the plastics is usually a. less than the specific gravity of metals b. more than the specific gravity of metals c. similar to the specific gravity of metals d. Unpredictable
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11) The process of combining two or more distinct polymer molecules to form a new product with different characteristics is called as a. binding b. stabilizing c. filling d. blending
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12) Power consumption in D.C. arc welding is a. less than the power consumption in A.C. arc welding b. more than the power consumption in A.C. arc welding c. similar to the power consumption in A.C. arc welding d. very difficult to calculate
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13) Which type of process the machining can be? a. Cold working b. Hot working c. Both a. and b. d. None of the above
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14) Which type of arc welding is suitable for joining non-ferrous metals? a. D.C. Arc welding b. A.C. Arc welding c. Both D.C. As well as A.C. Arc welding d. None of the above
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15) Which of the following options best describes the centre lathes? a. Machining machines b. Shaping machines c. Turning machines d. None of the above
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16) Castings are usually a. costlier than forgings b. cheaper than forgings c. at the same rate as forging for similar metal d. none of the above
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17) The materials such as lead and barium, which are added with polymers to minimize the effect of heat, sunlight and ozone are called as a. binders b. blenders c. stabilisers d. fillers
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18) Why are the plasticisers added with polymers? a. To hold other constituents of plastic together b. To reduce the cost and enhance the strength and hardness of plastics c. To improve flexibility and to reduce the temperature and pressure required for moulding of plastics d. None of the above
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19) When the tool of centre lathe moves perpendicular to the axis of rotation, a. it produces a cylindrical surface b. it produces a flat surface c. it produces a tapered surface d. none of the above
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20) The foundation of the centre lathe is called as a. carriage b. tray c. base d. bed
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