Helum gas is used as working substance in an engine working on a thermodynamic cycle
Channel: Doubtnut
Date: 16/02/2020

Helum gas is used as working substance in an engine working on a thermodynamic cycle A � B � C � D � A. Process AB is isobaric, BC is adiabatic compression. During process CD, pressure is increased keeping the volume constant and DA is an isothermal process. The gas has maximum volume at A and the ratio of maximum to minimum volume during the entire cycle is `8sqrt(2)` . Also, the ratio of maximum to minimum absolute temperature is 4. (a) Represent the cycle on a P � V diagram. (b) Calculate efficiency of the cycle in percentage if it is used as an engine. [Take ln 2 = 0.693]