For an ideal gas-turbine cycle with two stages of compressionand two stages of expansion, the pressure ratio across each stageof the compressor and turbine is 3. The air enters each stage ofthe compressor at 300 K and each stage of the turbine at 1200K.Using variable specific heats, determine the back work ratio andthe thermal efficiency of the cycle, assuming
(a)no regenerator is used,
(b)a regenerator with 75% effectiveness is used.
