Reactors designed for propulsion applications are designed for_______________?
(A) natural uranium
(B) enriched uranium
(C) pure uranium
(D) any type of uranium
(D) none of the above
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
(D) stopped
In the breeder reactors the generation of new fissionable atom is_________________?
(A) at the lower rate than the consumption
(B) at a higher rate than the constuption
(C) at an equal rate of the consumption
(D) depends on other considerations
(D) unpredictable
Half life of a radioactive isotope corresponds to the time required for half of the following to decay__________________?
(A) electrons
(B) protons
(C) neutrons
(D) nulceus
(D) atom
In boiling water reactor, moderator is__________________?
(A) coolant itself
(B) ferrite rod
(C) graphite rod
(D) liquid sodium metal
(D) blanket of thorium
Pressurised water reactor is designed________________?
(A) for boiling pi water in the core
(B) to use liquid sodium metal as coolant
(C) to use intermediate coolant
(D) to prevent the water coolant from boiling in the core
(D) to eliminate the coolant loop of the pressurised water
Effective moderators are those materials which contain____________________?
(A) light weight atoms
(B) heavy weight atoms
(C) critical atoms
(D) zero weight atoms
(D) there is no such criterion
The coolant used in boiling water reactor is________________?
(A) Co2
(B) pressurised water
(C) mixture of water and steam
(D) liquid metal
(D) mercury
The most practical fuel for a thermo-nuclear reactor, both from econocical and nuclear consideration is____________________?
(A) plutonium
(B) uranium
(C) deuterium
(D) thorium
(D) lithium