# Thermodynamics Quiz for Fun and Quiz Competition Practice 4

## Results

### #5. The efficiency of a heat engine working between heat reservoirs at temperature 327 oC and 27 oC respectively is

Author: SOM ABHISEK

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1. Efficiency of a perfectly reversible heat engine
operating between absolute temperatures T and
zero is equal to __.
a. 0
b. 0.5
c. Infinity
d. None of the above()
2. A reversible heat engine can have 100% efficiency
if the temperature of the sink is __.
a. Less than that of source
b. 0 K
c. 0
oC
d. Equal to that of source
3. For an infinitesimal process,
a. dU = dq – dW
b. dq = dU + dW
c. dU= dW – dq
d. dU= dq + dW()
4. In a heat engine, the maximum heat that can be
converted into mechanical work
a. depends upon friction()
b. depends upon working temperatures
c. is 100%
d. depends upon the working
5. The efficiency of a heat engine working between
heat reservoirs at temperature 327
oC and 27
oC
respectively is
a. 25%
b. 50%()
c. 75%
d. 100% 