During throttling process___________________?

A. heat exchange does not take place
B. no work is done by expanding steam
C. there is no change of internal energy of steam
D. all of the above
E. entropy decreases

In order that a cycle be reversible, following must be satisfied ________________?

A. free expansion or friction resisted expansion/compression process should not be encountered
B. when heat is being absorbed, temperature of hot source and working sub¬stance should be same
C. when beat is being rejected, temperature of cold source and working sub-stance should be same
D. all of the above
E. none of the above

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