62) A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be

63) The frictional power (F.P.) is given by

64) The unit million electron volts (Mev) is commonly used to measure the nuclear energy.

65) The knocking tendency in spark ignition engines can be decreased by adding dopes like tetra ethyle lead and ethylene dibromide.

66) A diesel engine has compression ratio from