26. | If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor. |
a. | critical |
b. | breeder |
c. | fertile |
d. | heterogenous |
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Answer: (b).breeder
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27. | Wrought iron is never shaped by |
a. | casting |
b. | cold working |
c. | forging |
d. | welding |
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Answer: (a).casting
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28. | Which one of the following is incombustible ? |
a. | H₂ |
b. | CCl₄ |
c. | C₂H₂ |
d. | S |
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Answer: (b).CCl₄
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29. | The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used. |
a. | hard |
b. | soft |
c. | silicon carbide |
d. | aluminium oxide |
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Answer: (d).aluminium oxide
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30. | Tin based white metals are used, where bearings are subjected to |
a. | high pressure & load. |
b. | low pressure & load. |
c. | high temperature. |
d. | large surface wear. |
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Answer: (a).high pressure & load.
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