61. 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.
Ans: a
62. 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.
Ans: c
63. 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
(e) unpredictable.
Ans: b
64. 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.
Ans: d
65. Reactors designed for propulsion applications are designed for
(a) natural uranium
(b) enriched uranium
(c) pure uranium
(d) any type of uranium
(e) none of the above.
Ans: b
66. Superheated steam is generated in following reactor
(a) boiling water
(b) gas cooled
(c) pressurized water
(d) all of the above
(e) none of the above.
Ans: b
67. Solid- fuel for nuclear reactions may be fabricated into various small shapes such as
(a) plates
(b) pallets
(c) pins
(d) any one of the above
(e) none of the above.
Ans: d
68. Which of the following is more appropriate for a moderator. One which
(a) does not absorb neutrons
(b) absorbs neutrons
(c) accelerates neutrons
(d) eats up neutrons
(e) regenerates neutrons.
Ans: a
69. A fission chain reaction in uranium can be developed by
(a) slowing down fast neutrons so that Uz fission continues by slow motion neutrons
(b) accelerating fast neutrons
(c) absorbing all neutrons
(d) using moderator
(e) enriching U235.
Ans: a
70. 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.
Ans: b
(a) chain reaction can be initiated
(b) it becomes uncontrollable
(c) it explodes
(d) it produces no power
(e) it produces tremendous power.
Ans: a
62. 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.
Ans: c
63. 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
(e) unpredictable.
Ans: b
64. 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.
Ans: d
65. Reactors designed for propulsion applications are designed for
(a) natural uranium
(b) enriched uranium
(c) pure uranium
(d) any type of uranium
(e) none of the above.
Ans: b
66. Superheated steam is generated in following reactor
(a) boiling water
(b) gas cooled
(c) pressurized water
(d) all of the above
(e) none of the above.
Ans: b
67. Solid- fuel for nuclear reactions may be fabricated into various small shapes such as
(a) plates
(b) pallets
(c) pins
(d) any one of the above
(e) none of the above.
Ans: d
68. Which of the following is more appropriate for a moderator. One which
(a) does not absorb neutrons
(b) absorbs neutrons
(c) accelerates neutrons
(d) eats up neutrons
(e) regenerates neutrons.
Ans: a
69. A fission chain reaction in uranium can be developed by
(a) slowing down fast neutrons so that Uz fission continues by slow motion neutrons
(b) accelerating fast neutrons
(c) absorbing all neutrons
(d) using moderator
(e) enriching U235.
Ans: a
70. 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.
Ans: b
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