41.
The sensing element in the control system of nuclear reactors measures the _________ of the neutron flux in the reactor.

42.
In diesel engine, the compression ratio in comparison to expansion ratio is

43.
A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of

44.
A fuel of cetane number 40 has the same ignition quality as a mixture of

45.
The term scavenging is generally associated with

46.
The knocking tendency in spark ignition engines may be decreased by

47.
The knocking in diesel engines may be prevented by

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