Question

A moderator generally used in nuclear power plants is
A. graphite
B. heavy water
C. concrete
D. graphite and concrete

Answer 1

A moderator generally used in nuclear power plants is graphite and concrete

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Answer 2

Graphite and concrete moderator is used in nuclear power plants.

Answer: D

Explanation:

The moderators are the components used in nuclear reactor which are used to slow down the speed of the neutron in the nuclear reaction.

During a nuclear reaction, the neutrons hit on the hydrogen atom to produce energy, this hitting process takes place only when the speed of the neutron not very high. This steps are followed only in thermal reactor.

The moderators should not absorb the neutrons and it should be a light material. Thus, graphite and concrete are used as moderator.