A. 4 J
B. ∞
C. 0
D. 8 J
A. Sub-cooled
B. Saturated
C. Non-solidifiable
D. None of these
A. its internal energy (U) decreases and its entropy (S) increases
B. U and S both decreases
C. U decreases but S is constant
D. U is constant but S decreases
A. ∞
B. -ve
C. 0
D. +ve
A. Reverse Carnot cycle
B. Ordinary vapour-compression cycle
C. Vapour-compression process with a reversible expansion engine
D. Air refrigeration cycle
A. Air compressor
B. Liquid cooling system of an automobile
C. Boiler
D. None of these
A. Isolated
B. Closed
C. Open
D. None of these