147) A gas engine has a swept volume of 300 cm³ and clearance volume of 25 cm³. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

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.