Chemical Engineering - Nuclear Power Engineering

6. 

Pressure in a Pressurised Water Reactor (PWR) is used for

A. maintaining constant pressure in the primary cooling circuit under varying loads.
B. superheating the steam.
C. pressurising the water in the primary coolant circuit.
D. none of these.

Answer: Option A

Explanation:

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7. 

Pick out the wrong statement.

A. The disintegration rate of a radioactive substance can not be increased by heating it.
B. Electrons have negligible mass and unit negative change.
C. Deuterium atom has one proton and two neutrons in its nucleus.
D. Cadmium is capable of absorbing neutrons.

Answer: Option C

Explanation:

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8. 

Water is a better coolant than a gas (like CO2, He, N2 etc.), because it

A. is a better neutron moderator as well.
B. requires comparatively smaller pumps and heat exchanger for a given heat transfer rate.
C. has a better heat transfer characteristics, and it can be pressurised to attain a high temperature.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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9. 

Net efficiency of ordinary light water cooled nuclear reactor is about __________ percent.

A. 32
B. 52
C. 72
D. 88

Answer: Option A

Explanation:

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10. 

The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is

A. less
B. more
C. same
D. much more

Answer: Option A

Explanation:

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