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3. Find the efficiency of the following engines and mention which one of the engines is...

3. Find the efficiency of the following engines and mention which one of the engines is an efficient engine?
a. An engine operating between 600 K and 200 K
b. An engine operating between 150 0C and 20 0C
4. A steel pipe [ α = 1.2 * 10-5 / 0C] is 1000 cm long at 20 0C. What is the new length of the pipe when a steam of 100 0C pass through it.
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