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

Related Mcqs:

1. In order to have constant clain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be________________?

   A. greater than 1.0
   B. less than 1.0
   C. equal to zero
   D. equal to 1.0
   E. equal to infinity

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

   A. chain reaction can be initiated
   B. it becomes uncontrollable
   C. it explodes
   D. it produces no power
   E. it produces tremendous power

3. 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

4. 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.

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. In triggering fission, which type of neutrons are more effective_________________?

   A. fast
   B. slow
   C. in bulk
   D. static
   E. activated

7. In triggering fission, the following types of neutrons are desirable_________________?

   A. fast moving
   B. slow moving
   C. critical neutrons
   D. neutrons at rest
   E. none of the above

8. The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be________________?

   A. more
   B. less
   C. same
   D. zero
   E. negative, i.e. fuel would be generated

9. Each fission of U235 produces following number of fast neutrons per fission________________?

   A. 1 neutron
   B. 1 — neutrons
   C. 1 – 2 neutrons
   D. 2 — neutrons
   E. infinite

10. 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