102) The material most commonly used for sheilding is

103) In order to eliminate knocking in compression ignition engines, there should be

104) In a petrol engine, the charge is ignited with the help of a spark plug.

105) Reflector in nuclear power plants __________ neutron leakage.

106) Number of working strokes per min. for a two stroke cycle engine are __________ the speed of the engine in r.p.m.