Nuclear Power Plants

11. Amongst the following, the fissionable materials are

1. U233andPu239
2. U23iandPu233
3. U235andPu235
4. U238andPu239
5. U243andPu235

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12. Artificial radioactive isotopes find application in

1. power generation
2. nucleonic devices
3. nuclear fission
4. nuclear fusion
5. medical field.

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13. Atomic number of an element in the periodic table represents the numbers of

1. protons in the nucleus
2. electrons in me nucleus
3. neutrons in the nucleus
4. electrons in the atom
5. neutrons in the atom.

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14. Boiling water reactor employs

1. boiler
2. direct cycle of coolant system
3. double circuit system of coolant cycle
4. multi pass system
5. single circuit system.

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15. Boiling water reactor uses the following as moderator, coolant and working fluid

1. ordinary fluid
2. heavy water
3. molten lead
4. hydrogen gas
5. none of the above.

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16. Breeder reactor has a conversion ratio of

1. unity
2. more than unity
3. less than unity
4. zero
5. infinity.

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17. Breeder reactors employ liquid metal coolant because it

1. acts as good moderator
2. produces maximum steam
3. transfers heat from core at a fast rate
4. breeds neutrons
5. increases rate of reaction in core.

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18. Each fission of U235 produces following number of fast neutrons per fission

1. 1 neutron
2. 1 — neutrons
3. 1 - 2 neutrons
4. 2 — neutrons
5. infinite.

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19. Effective moderators are those materials which contain

1. light weight atoms
2. heavy weight atoms
3. critical atoms
4. zero weight atoms
5. there is no such criterion.

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20. Electron-volt is the unit of

1. atomic power
2. energy
3. voltage
4. radio activity
5. there is no such unit.

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