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.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?