Nuclear Power Plants Online Quiz Questions and Answers

81.    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
(e) atom.
Ans: e

82.    Pressurized 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
(e)    to eliminate the coolant loop of the pressurized water.
Ans: d

83.    The coolant used in boiling water reactor is
(a)     C02
(b)     pressurized water
(c)    mixture of water and steam
(d)    liquid metal  
(e) mercury.
Ans: c

84.    In boiling water reactor, moderator is
(a)     coolant itself
(b)     ferrite rod
(c)    graphite rod
(d)    liquid sodium metal
(e)    blanket of thorium.
Ans: a

85.    The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration is
(a) plutonium    
(b) uranium
(c) deuterium
(d) thorium
(e) lithium.
 Ans: c

86.    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
(e)    nuclear hazard risk.
Ans: d

87.    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
(e)    decrease of speed of neutrons.
Ans: d

88.    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.
 Ans: b

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