Amotor vehicle engine operating with a diesel engine takes in atmospherics air at a temperature of 30°c and pressure of 1 bar. during combustion, the maximum obtainable temperature is 1345°c. calculate (a) the air standard (b) thermal efficiency of this diesel engine if the compression ration is 24/2.

Asimple speed reducer is composed of 2 spur gears. the pinion gear has a pitch diameter of 0.75" and 36 teeth while the driven gear has a pitch diameter of 4.0" and 192 teeth. a)-what is the diametral pitch of each gear? b)-if an electric motor rotating ccw at 3000 rpm is coupled to the pinion, what is the rotational speed of the driven gear? c)-if the torque delivered to the pinion is 1 n-m, what is the torque on the driven gear? d)-what is the power transmitted by the gear train?