Engineering Thermodynamics
Which of the following is the correct statement?

Irreversible engines have maximum efficiency.
All the reversible engines have the same efficiency.
All the reversible and irreversible engines have the same efficiency.
All engines are designed as reversible in order to obtain maximum efficiency.

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Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

All of these
When beat is being rejected, temperature of cold source and working substance should be same
When heat is being absorbed, temperature of hot source and working substance should be same
Free expansion or friction resisted expansion/compression process should not be encountered

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Engineering Thermodynamics
Which is the incorrect statement about Carnot cycle?

It is used as the alternate standard of comparison of all heat engines
It provides concept of maximising work output between the two temperature limits
All of these
All the heat engines are based on Carnot cycle

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can
Heat can

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