1. Which gives the efficiency of an engine? a) It is the product of the heat abs
ID: 1545605 • Letter: 1
Question
1. Which gives the efficiency of an engine?
a) It is the product of the heat absorbed from the high-temperature reservoir and the work done by the engine.
b) It is the ratio of the heat absorbed from the high-temperature reservoir to the work done by the engine.
c) It is the ratio of the work done by the engine to the heat absorbed from the high-temperature reservoir.
d) It is the product of the heat lost to the low-temperature reservoir and the work done by the engine.
e) It is the ratio of the heat lost to the low-temperature reservoir to the work done by the engine.
f) It is the ratio of the work done by the engine to the heat lost to the low-temperature reservoir.
2. If we decrease the difference in the temperatures of the two reservoirs used for running an ideal refrigerator, what happens to the coefficient of performance?
a) Increases
b) decreases
c) remains the same
3. Which gives the coefficient of performance of a refrigerator?
a) It is the product of the heat absorbed from the low-temperature reservoir and the work done by the refrigerator.
b) It is the ratio of the heat absorbed from the low-temperature reservoir to the work done by the refrigerator.
c) It is the ratio of the work done by the refrigerator to the heat absorbed from the low-temperature reservoir.
d) It is the product of the heat lost to the high-temperature reservoir and the work done by the refrigerator.
e) It is the ratio of the heat lost to the high-temperature reservoir to the work done by the refrigerator
f) It is the ratio of the work done by the refrigerator to the heat lost to the high-temperature reservoir.
Explanation / Answer
1. Which gives the efficiency of an engine?
b) It is the ratio of the heat absorbed from the high-temperature reservoir to the work done by the engine
2. If we decrease the difference in the temperatures of the two reservoirs used for running an ideal refrigerator, what happens to the coefficient of performance?
b) decreases
3. Which gives the coefficient of performance of a refrigerator?
e) It is the ratio of the heat lost to the high-temperature reservoir to the work done by the refrigerator
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