5) An ideal heat engine is operating between high and low temperature reservoirs

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5) An ideal heat engine is operating between high and low temperature reservoirs. Suppose that now the low temperature reservoir has its temperature lowered, but no other changes are made. This temperature change affects the engine efficiency in which of the following ways?

A) The efficiency decreases

B) The efficiency is unchanged

C) The efficiency increases

6) A Camot engine operating between reservoirs at 500°C and 300°C would have an efficiency of approximately

A) 0.11

B) 0.30.

C) 0.50

D) 0.67.

E) 0.74.

7) A heat engine having an efficiency of 0.20 takes in 2000 J of energy from the hot reservoir in one cycle. In the same time, how much work will it perform?

A) OJ

B) 400 J

C) 1000

D) 120 J

E) 33,333J

8) If, for an ideal heat engine, OH, QC, and Ware, respectively, the heat absorbed, the heat exhausted, and the work done per cycle, which of these is true?

A) QH cannot be more than W

B) Qc cannot be more than QH

C) W cannot be more than QC

D) QH cannot be more than QC