71.
The following present serious difficulty in designing reactor shield

73.
The most commonly used moderator in nuclear plants is

74.
Breeder reactor has a conversion ratio of

75.
Hydrogen is preferred as better coolant in comparison to CO2 because former

76.
Half life of a radioactive isotope corresponds to the time required for half of the following to decay

77.
When a reactor becomes critical, then the production of neutrons is

78.
The energy released during the fission of one atom of Uranium 235 in million electron volts is about

79.
Plutonium is produced

80.
In triggering fission, the following types of neutrons are desirable

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