find the pressure and temperature at the end of compression, a) if cold air (k=1.4) is the working substance, b) if hot air (k=1.32) is the working substance.

KYIP Menu Go back Otto and Diesel Cycle Problems? 1. An Otto cycle with a compression ratio of 7.5 operates from the suction conditions of 97.91 Kpa, 29.4C. find the pressure and temperature at the end of compression, a) if cold air (k=1.4) is the working substance, b) if hot air (k=1.32) is the working substance. 2. An ideal Otto engine, operating on the hot-air standard with k=1.34, has a compression ratio of 5. At the beginning of compression the volume is 6ft 3 , the pressure is 13.75 psia and temperature is 100F. during constant – volume heating , 350 Btu are added per cycle. Compute T 3 ,P 3 ,T 4 ,Qa,Qr,Wnet,thermal Efficiency, and mean effective pressure. 3. An ideal Diesel engine operates on 1 lb of air with a suction state at 14.1 psia and 100F. The pressure at the end of compression is 470psia and the cut –off is 6% of the stroke from head –end dead - center. Using air properties(r=53.34 ft-lbf/lbm-R, k=1.4, Cp=.24,Cv=.1714 Btu/lbm-R), determine compression ratio, percentage clearance, Qa, Qr, Thermal Efficiency, mean effective pressure. 4. There are supplied 317 Kj/cycle of Diesel engine operating on 227g of air P 1 =97.91 KPa, T 1 =48.9C. At the end of compression, P 2 =3930KPa. Assume that air and the product within the cycle have air properties. Determine compresion ratio, cut-off ratio,Wnet, thermal efficiency, and mean effectivepressure. 5. For an ideal Diesel cycle with the over-all value of k=1.33,rk=15, rc=2.1, P 1 = 97.9 Kpa, find P 2 and mean effective pressure.