Nuclear Power Plants

51. Solid- fuel for nuclear reactions may be fabricated into various small shapes such as

1. plates
2. pallets
3. pins
4. any one of the above
5. none of the above.

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52. Supertheated steam is generated in following reactor

1. boiling water
2. gas cooled
3. pressurised water
4. all of the above
5. none of the above.

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53. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is

1. same
2. lower
3. higher
4. unity
5. higher/lower depending on the size of reactor.

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54. The commonly used material for shielding is

1. lead or concrete
2. lead and tin
3. graphite or cadmium
4. thick galvanised sheets
5. black carbon papers.

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55. The coolant used in boiling water reactor is

1. Co2
2. pressurised water
3. mixture of water and steam
4. liquid metal
5. mercury.

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56. The efficiency of a nuclear power plant in comparison to conventional and nuclear considerationis

1. higher cost of nuclear fuel
2. high initial cost
3. high heat rejection in condenser
4. lower temperature and pressure condi-tions
5. nuclear hazard risk.

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57. The efficiency of a nuclear power plant in comparsion to a conventional thermal power plant is

1. same
2. more
3. less
4. may be less or mote depending on size
5. unpredictable.

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58. The energy produced by a thermal reactor of same size as a breeder reactor is

1. almost same
2. slightly more
3. slightly less
4. much less
5. much more.

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59. The energy required to be applied to a radioactive nucleus for the emission of a neutron is

1. 1 MeV
2. 2.4 MeV
3. 4.3 MeV
4. 7.8 MeV
5. 20 MeV.

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60. The fast breeder reactor uses the following moderator

1. demineralised water
2. carbon dioxide
3. heavy water
4. graphite
5. no moderator is used.

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