| 41. | An alloy of Fe - 0.4 % C is |
| a. | cast iron. |
| b. | hypo-eutectoid steel. |
| c. | hyper-eutectoid steel. |
| d. | eutectoid steel |
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Answer: (b).hypo-eutectoid steel.
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| 42. | A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'; an example of which is |
| a. | lead |
| b. | glass |
| c. | mica |
| d. | silver |
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Answer: (a).lead
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| 43. | Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body. |
| a. | grey |
| b. | black |
| c. | opaque |
| d. | white |
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Answer: (a).grey
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| 44. | In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that |
| a. | compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller. |
| b. | maintaining vacuum on tube side is more difficult than that on the shell side. |
| c. | water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam. |
| d. | condenser can act as a storage unit for condensed steam. |
| View Answer Report Discuss 50-50! |
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Answer: (c).water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
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| 45. | Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography. |
| a. | X-rays |
| b. | γ-rays |
| c. | α-rays |
| d. | β-rays |
| View Answer Report Discuss 50-50! |
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Answer: (b).γ-rays
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