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| 1 | In the absence of friction, heat engines are 100 percent efficient. |
 | A) | True |
| B) | False |
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| 2 | If the first law of thermodynamics is satisfied, the second law will also be satisfied. |
| A) | True |
| B) | False |
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| 3 | In every thermodynamic process, the heat absorbed by a system must equal the sum of the work done by the system and its change in internal energy. |
| A) | True |
| B) | False |
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| 4 | An isochoric process is graphed as a straight line on a P-V diagram. |
| A) | True |
| B) | False |
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| 5 | In an adiabatic process, the internal energy will increase when work is done on the system, whereas it will decrease when work is done by the system. |
| A) | True |
| B) | False |
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| 6 | During an isothermal expansion, all the absorbed thermal energy is converted to useful work. |
| A) | True |
| B) | False |
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| 7 | All Carnot engines are perfect engines and, therefore, operate at 100 percent efficiency. |
| A) | True |
| B) | False |
|
| 8 | The greater the difference between the input and output temperatures of a steam engine, the greater the efficiency of the engine. |
| A) | True |
| B) | False |
|
| 9 | A high compression ratio of an internal combustion engine means a higher operating efficiency. |
| A) | True |
| B) | False |
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| 10 | The coefficient of performance for a refrigerator is a measure of cooling efficiency and is expressed as a percentage. |
| A) | True |
| B) | False |
|
| 11 | The thermodynamic state of a gas refers to |
| A) | its pressure |
| B) | its volume |
| C) | its temperature |
| D) | all of these |
|
| 12 | The net work accomplished by an engine undergoing adiabatic compression is equal to |
| A) | ΔU |
| B) | -ΔU |
| C) | ΔQ |
| D) | -ΔQ |
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| 13 | An engine that operates with 100 percent efficiency |
| A) | is a Carnot engine |
| B) | violates the first law |
| C) | has an Otto cycle |
| D) | violates the second law |
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| 14 | If a heat engine absorbs heat at 600 K and rejects heat at 200 K, its efficiency is |
| A) | 33 percent |
| B) | 50 percent |
| C) | 67 percent |
| D) | 80 percent |
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| 15 | In a Carnot cycle, 1600 cal is absorbed at 600 K, and 400 cal is exhausted to a cold reservoir. The temperature of the cold reservoir is |
| A) | 150 K |
| B) | 200 K |
| C) | 450 K |
| D) | 800 K |
|
| 16 | An adiabatic process is one in which |
| A) | the temperature is constant |
| B) | the pressure is constant |
| C) | the volume is constant |
| D) | no heat enters or leaves the system |
|
| 17 | If the adiabatic constant is 1.4 and the compression ratio is 6, a gasoline engine has an efficiency of |
| A) | 45 percent |
| B) | 51 percent |
| C) | 56 percent |
| D) | 64 percent |
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| 18 | For a Carnot engine to operate with an efficiency of 100 percent, the exhaust temperature must be |
| A) | 0°C |
| B) | 0 K |
| C) | infinite |
| D) | equal to the input temperature |
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| 19 | In a mechanical refrigerator, the low-temperature coils of the evaporator are at -23°C, and the compressed gas in the condenser has a temperature of 77°C. The coefficient of performance is |
| A) | 20 percent |
| B) | 70 percent |
| C) | 0.23 |
| D) | 2.5 |
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| 20 | In a typical refrigerator, heat is extracted from the interior by the |
| A) | compressor |
| B) | evaporator |
| C) | condenser |
| D) | throttling valve |
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| 21 | The efficiency of a heat engine is the ratio of the to the . |
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| 22 | A(n) process is one in which the volume remains constant, whereas in a(n) process the temperature is constant. |
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| 23 | The throttling process is an example of a(n) process. |
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| 24 | The area under the curve on a P-V diagram represents the in a thermodynamic process. |
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| 25 | Three coordinates used to describe the thermodynamic state of a system are , , and . |
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| 26 | The is essentially a restatement of the conservation of
energy. |
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| 27 | A(n) is a heat engine operating in reverse. Its effectiveness is measured by the . |
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| 28 | Four essential elements of a typical refrigerator include the , , ,
and . |
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| 29 | The fact that all natural spontaneous processes are irreversible is a consequence of the . |
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| 30 | A(n) engine has the maximum possible efficiency for an engine that absorbs heat from one reservoir, performs work, and rejects heat to another reservoir at a lower temperature. |