An heat engine (HE) operates between a source and sink temperatures of 1600 degr

Question

An heat engine (HE) operates between a source and sink temperatures of 1600 degree K and 400 degree K respectively. The heat engine receives 1000 kJ/s from the source and produces 500 KW net work, Calculate (a) the irreversilities of the heat engine (b) The thermal efficiency of the heat engine Work is a path function while heat is not a path function (a) True (b) False Mass, energy, entropy can not flow in or out of a closed system, (a)True (b) False Energy, entropy, and exergy are all conserved (a) True (b) False The principle of entropy increase of the universe refers to irreversibilities of all real systems and processes (a) True (b) False A diesel auto engine normally operates at a lower compression ratio compared to a spark ignition auto engine (a) True) (b) False Thermal efficiency of the ideal Brayton cycle with regeneration is more effective at (a) lower (b) higher pressure ratio A multi-stage compressor with or without intercooling consumes the same amount of energy (a) true) (b) False

Explanation / Answer

1. Both are path functions

2.false statement ,they all flow in a closed system

3.false entropy is not conserved .it can be created and dissipated

4)The statement is true

5)The Answer is false .both engines are undergo low compression but spark igintion engine goes lower compression

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