554. 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.(c) equal to 1.0

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555. Pressurised water reactor is-designed
A.For boiling 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

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556. The coolant used in boiling water reactor is
A.CO2
B.(c) mixture of water and steam
C.(d) liquid metal
D.(e) mercury.

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557. In boiling water reactor, moderator is
A.Coolant itself
B.Ferrite rod
C.Graphite rod
D.Liquid sodium metal

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558. The most practical fuel for a thermo-nuclear reactor, both from econocical and nuclear consideration is
A.Plutonium
B.Uranium
C.Deuterium
D.Thorium

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559. The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is
A.Higher cost of nuclear fuel
B.High initial cost
C.High heat rejection in condenser
D.Lower temperature and pressure conditions

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560. The presence of reflector in nuclear power plants results in
A.Increased production of neutrons
B.Complete absorption of neutrons
C.Controlled production of neutrons
D.Decreased leakage of neutrons

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