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24.4-24.5
Test Description: 2nd and 3rd Laws of Thermodynamics
Instructions: Answer all questions to get your test result.
1) Heat will never of itself flow from a cold object to a hot object.
A
3rd Law of Thermodynamics
B
1st Law of Thermodynamics
C
2nd Law of Thermodynamics
2) Heat can be made to flow from cold to hot by
A
Applying external effort
B
Increasing heat
C
Changing temperature
3) No object has ever reached absolute zero and no object ever will.
A
True
B
False
4) For a heat engine to do mechanical work, heat must flow from a high temperature to a low temperature.
A
False
B
True
5) Many heat engines are able to convert all heat input into mehcanical energy output.
A
False
B
True
6) Calculate the ideal efficiency of a steam turbine that has a hot reservoir of 315 K and a condenser temperature of 217 K.
A
31
B
.31
C
98
D
.98
7) No heat engine can have an ideal efficiency of 100%.
A
False
B
True
8) When using the formula for Carnot efficiency, temperature must be in
A
Kelvins
B
degrees Celsius
C
degrees Fahrenheit
9) If you wanted to increase the efficiency of a heat engine which of the following would you have to increase?
A
T cold
B
work
C
heat
D
T hot
10) What determines the ideal efficiency of a heat engine?
A
the heat it uses
B
the temperature difference between hot and cold
C
the work done by the engine
D
the exhaust it puts out
*select an answer for all questions
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