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Q.

A carnot engine takes 3×106cal of heat from a reservoir at 6270C and gives it to a sink at 270C .  The work done by engine is

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a

4.2×106J

b

16.8×106J

c

8.4×106J

d

25.2×106J

answer is C.

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Detailed Solution

T1−T2T1=WQ1 900−300900=W3×106×4.2 W=8.4×106J
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A carnot engine takes 3×106cal of heat from a reservoir at 6270C and gives it to a sink at 270C .  The work done by engine is