24.4-24.5: Question Preview (ID: 5696)

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Heat will never of itself flow from a cold object to a hot object.
a) 1st Law of Thermodynamics b) 2nd Law of Thermodynamics c) 3rd Law of Thermodynamics d)
Heat can be made to flow from cold to hot by
a) Changing temperature b) Applying external effort c) Increasing heat d)
No object has ever reached absolute zero and no object ever will.
a) True b) False c) d)
For a heat engine to do mechanical work, heat must flow from a high temperature to a low temperature.
a) False b) True c) d)
Many heat engines are able to convert all heat input into mehcanical energy output.
a) False b) True c) d)
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
No heat engine can have an ideal efficiency of 100%.
a) True b) False c) d)
When using the formula for Carnot efficiency, temperature must be in
a) degrees Celsius b) degrees Fahrenheit c) Kelvins d)
If you wanted to increase the efficiency of a heat engine which of the following would you have to increase?
a) T hot b) T cold c) work d) heat
What determines the ideal efficiency of a heat engine?
a) the work done by the engine b) the temperature difference between hot and cold c) the exhaust it puts out d) the heat it uses
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