Nuclear Power Plants Engineering Online Quiz Questions Test2

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1. The size of the reactor is said to be critical when
chain reaction can be initiated	it becomes uncontrollable
it explodes	it produces no power

2. When a reactor becomes critical, then the production of neutrons is ______.
infinite	zero
exactly balanced by the loss of neutrons through leakage	initiated

3. In the breeder reactors the generation of new fissionable atom is ______.
at the lower rate than the consumption	at a higher rate than the constuption
at an equal rate of the consumption	depends on other considerations

4. The energy produced by a thermal reactor of same size as a breeder reactor is ______.
almost same	slightly more
slightly less	much less

5. Reactors designed for propulsion applications are designed for ______.
natural uranium	enriched uranium
pure uranium	any type of uranium

6. Supertheated steam is generated in following reactor
boiling water	gas cooled
pressurised water	all of the above

7. Solid- fuel for nuclear reactions may be fabricated into various small shapes such as
plates	pallets
pins	any one of the above

8. Which of the following is more appropriate for a moderator. One which
does not absorb neutrons	absorbs neutrons
accelerates neutrons	eats up neutrons

9. A fission chain reaction in uranium can be developed by ____.
slowing down fast neutrons so that Uz fission continues by slow motion neutrons	accelerating fast neutrons
absorbing all neutrons	using moderator

10. In triggering fission, the following types of neutrons are desirable
fast moving	slow moving
critical neutrons	neutrons at rest

11. Effective moderators are those materials which contain
light weight atoms	heavy weight atoms
critical atoms	zero weight atoms

12. In a fission process, maximum age of energy is released as
kinetic energy of neutrons	kinetic energy of fission products
instantaneous release of gamma rays	gradual readioactive decay of fission products

13. The following present serious difficulty in designing reactor shield
alpha particles	beta particles
thermal neutrons	fast neutrons and gamma rays

14. In nuclear fission
the original elements change into completely different elements	the electrons of the element change
the molecules rearrange themselves to form other molecules	none of the above

15. 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
greater than 1.0	less than 1.0
equal to zero	equal to 1.0

16. Each fission of U235 produces following number of fast neutrons per fission
1 neutron	1 — neutrons
1 - 2 neutrons	2 — neutrons

17. A fast breeder reactor uses following as fuel
enriched uranium	plutonium
thorium	U235

18. A boiling water reactor uses following as fuel
enriched uranium	plutonium
thorium	natural uranium

19. A fast breeder reactor
uses graphite rods as moderator	has powerful moderator
has no moderator	uses ferrite material as moderator

20. Artificial radioactive isotopes find application in
power generation	nucleonic devices
nuclear fission	medical field