51) Theoretically, a four stroke cycle engine should develop __________ power as that of a two stroke cycle engine.

52) Light weight substances can not be effective moderators.

53) The higher combustion chamber wall temperature in compression ignition engines will __________ knocking tendency.

54) The nuclear radiators produced in a reactor which must be sheilded are

55) A two stroke cycle engine gives __________ mechanical efficiency than a four stroke cycle engine.