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37.

Boiling water reactor uses the following as moderator, coolant and working fluid

A.	ordinary fluid	B.	heavy water
C.	molten lead	D.	hydrogen gas

38.

Ideally the neutron flux in reactor should be

A.	maximum in centre and zero at side	B.	maximum at side and zero in centre
C.	uniform throughout	D.	zero throughout

39.

Enriched uranium may contain fissionable contents of the order of

A.	1-99%	B.	1-25%
C.	1-50%	D.	1-75%

40.

U235 will undergo fission by

A.	high energy (fast) neutrons alone	B.	low energy (slow) neutrons alone
C.	either fast or slow neutrons	D.	medium energy neutrons

41.

U238 will undergo fission by

A.	high energy (fast) neutrons alone	B.	low energy (slow) neutrons alone
C.	either fast or slow neutrons	D.	medium energy neutrons

42.

A reactor capable of converting a ferrite material into fissile isotopes is called

A.	regenerative reactor	B.	fast breeder reactor
C.	breeder reactor	D.	boiling water reactor

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