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7.

A nuclear unit becoming critical means                        
A. it is generating power to rated capacity B. it is capable of generating much more than rated capacity
C. there is danger of nuclear spread D. chain reaction that causes automatic splitting of the fuel nuclei has been established



8.

Moderator in nuclear plants is used to                        
A. reduce temperature B. extract heat from nuclear reaction
C. control the reaction D. cause collision with the fast moving neutrons to reduce their speed



9.

The most commonly used moderator in nuclear plants is                        
A. heavy water B. concrete and bricks
C. graphite and concrete D. deuterium




10.

The nuclear energy is measured as                        
A. MeV B. curie
C. farads D. MW



11.

The total energy released in fission of U is                        
A. 5 MeV B. 10 MeV
C. 199 MeV D. 168 MeV



12.

Breeder reactor has a conversion ratio of                        
A. unity B. more than unity
C. less than unity D. zero



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