148) A supercharger receives air from the atmosphere surrounding the engine, compresses it to a higher pressure and then feeds it into the inlet valve of the engine.

149) Iso-octane (C₈H₁₈) has octane number of

150) The brake power is always greater than indicated power.

151) An ignition coil in the spark ignition engines supplies __________ voltage to the spark plug.

152) The operation of forcing additional air under pressure into the engine cylinder is known as