Engineering :: Thermodynamics
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11. |
If all the variables of a steam are in-dependent of time it is said to be in |
A. |
Steady flow |
B. |
Unsteady flow |
C. |
Uniform flow |
D. |
Closed flow |
E. |
Constant flow |
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Answer: Option A
Explanation:
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12. |
A control volume refers to |
A. |
A fixed region in space |
B. |
A specified mass |
C. |
An isolated system |
D. |
A reversible process only |
E. |
A closed system |
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Answer: Option A
Explanation:
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13. |
Internal energy of a perfect gas depends on |
A. |
Temperature, specific heats and pressure |
B. |
Temperature, specific heats and enthalpy |
C. |
Temperature, specific heats and entropy |
D. |
Temperature and specific heats |
E. |
Temperature only |
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Answer: Option E
Explanation:
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14. |
The vapour pressure of water at 30?C in pascals is |
Answer: Option E
Explanation:
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15. |
According to Charle's law |
A. |
At constant pressure the volume of a gas is proportional to its temperature |
B. |
At constant pressure the volume of a gas is proportional to its absolute temperature |
C. |
At constant gauge pressure the molecular folume of a gas is proportional to its absolute temperature |
D. |
At constant volume the absolute pressure is proportional to absolute temperature |
E. |
None of the above |
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Answer: Option A
Explanation:
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16. |
The perfect heat engine works on the Carnot cycle between 1000?C and 200?C. The efficiency of the engine will be |
Answer: Option C
Explanation:
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17. |
In a reversible polytropic process |
A. |
Some heat transfer occurs |
B. |
The entropy remains constant |
C. |
The ethalpy remains constant |
D. |
The internal energy remains constant |
E. |
The temperature remains constant |
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Answer: Option B
Explanation:
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18. |
The velocity potential exists |
A. |
For all types of continuous flow |
B. |
Only for rotational flow |
C. |
Only for irrotational flow |
D. |
Only for laminar flow |
E. |
Only for unidirectional flow |
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Answer: Option C
Explanation:
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19. |
An isentropic process is always |
A. |
Irreversible and adiabatic |
B. |
Reversible and isothermal |
C. |
Frictionless and irreversible |
D. |
Reversible and adiabatic |
E. |
None of the above |
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Answer: Option D
Explanation:
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20. |
An ordinary mercury thermometer can be used for temperatures about |
Answer: Option C
Explanation:
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