L-1

A gas engine is supplied with 1,100 cfh of gas at 80 F and 5 in. WG. Barometer reads 30.2 in. Hg. Heating value of gas is 540 Btu per cu ft at 60 F and 30 in. Hg. Engine develops 52 hp. Calculate the thermal efficiency of the engine.

L-2

Calculate the temperature and pressure at the beginning of the expansion stroke in a gasoline engine, assuming no heat losses and combustion completed. The air to fuel ratio is 15, compression ratio is 6.2, the compression curve exponent is 1.3, and the pressure at the beginning of the compression stroke is 13 psia with a temperature of 150 F. Assume the heating value of the gasoline to be 20,000 Btu per lb and the specific heat during expansion is 0.3. Assume gases to be 1500 F and 17 psia when remaining in the clearance volume from previous explosion cycle.

L-3

Calculate the pressure and temperature at 90 per cent of the completion of the compression stroke in a four-cycle diesel engine having a compression ratio of 14. The air temperature at beginning of stroke is 150 F and the pressure is 13.7 psia.

L-4

The volume in the clearance space of a 6- by 10-in. Otto gas engine is 0.06 cu ft. Find the ideal thermal efficiency (ITE) of the engine on the air standard basis, if the exponent of the expansion and compression lines is 1.35.

L-5

A two-stroke-cycle internal-combustion engine operating at 3,000 rpm has cylinders 3 1/2...