82) The ratio of the brake power to the indicated power is called

83) The increase of efficiency of a compression ignition engine, as the load decreases, is due to

84) A turbo-jet does not require a turbine to drive the compressor.

85) For the same maximum pressure and heat input, the exhaust temperature of petrol engine is __________ than that of diesel engine.

86) The compression ratio in petrol engines is kept low as compared to diesel engines because higher compression ratio in petrol engines would lead to pre-ignition of fuel.