The compression ratio in an air standard Otto cycle is = 8 At the beginning of the compression stroke, the pressure is 0.1 MPa and temperature is 15C. The heat transfer to the air per cycle is 1800 KJ/Kg. (Take y=1.4, C, Adiabatic Adiabatic 0.716 KJ/Kg.K) 37) The pressure P3 is : V2 V1 8.2 MPa 0.5 MPa 3.1 MPa None 661.65 K 1326 K None 38) The temperature T4 is : 3175.6 K 39) The efficiency of the cycle is : 56.5% 6 23.7 % None 0.2% ENGINEERING PHYSICS ACADEMY www.ismailelgamal.com (B