The size of the reactor is said to be critical when_________________?

Related Mcqs:

1. When a reactor becomes critical, then the production of neutrons is_________________?

   A. infinite
   B. zero
   C. exactly balanced by the loss of neutrons through leakage
   D. initiated
   E. stopped

2. The breeding gain in case of thermal breeder reactor as compared to fast breeder reactor is________________?

   A. same
   B. lower
   C. higher
   D. unity
   E. higher/lower depending on the size of reactor

3. The energy produced by a thermal reactor of same size as a breeder reactor is__________________?

   A. almost same
   B. slightly more
   C. slightly less
   D. much less
   E. much more.

4. 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
   E. it generates no heat

5. A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is_________________?

   A. same
   B. more
   C. less
   D. there is no such criterion
   E. none of the above

6. Gas cooled reactor uses following materials as moderator, and coolant____________________?

   A. graphite, C02
   B. graphite, air
   C. heavy water, C02
   D. lead, H2
   E. concrete, N2

7. Boiling water reactor uses the following as moderator, coolant and working fluid________________?

   A. ordinary fluid
   B. heavy water
   C. molten lead
   D. hydrogen gas
   E. none of the above

8. A reactor capable of converting a ferrite material into fissile isotopes is called____________________?

   A. regenerative reactor
   B. fast breeder reactor
   C. breeder reactor
   D. boiling water reactor
   E. ferrite reactor

9. In boiling water reactor, moderator is__________________?

   A. coolant itself
   B. ferrite rod
   C. graphite rod
   D. liquid sodium metal
   E. blanket of thorium

10. A boiling water reactor uses following as fuel________________?

    A. enriched uranium
    B. plutonium
    C. thorium
    D. U
    E. natural uranium.