| 1. | What is the CORRECT order of decrease in entropy (a) solid phase (b) Liquid phase (c) Gaseous phase ? | |
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(a) > (c) > (b)
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(c) > (b) > (a)
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(c) > (a) > (b)
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(a) > (b) >(c)
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Report Question| 2. | The entropy always increases for an isolated system and when the equilibrium is reached, it is ________ ? | |
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maximum
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same as the initial starting state
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more than initial starting state
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zero
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| 3. | In a surrounding, the amount of irreversibility of a process undergone by a system is determined by ________ ? | |
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entropy change of the system
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entropy change of the surrounding
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entropy increase of the universe
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entropy decrease of the universe
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| 4. | For the same operating maximum pressure and temperature, which cycle will have the highest efficiency ? | |
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Diesel cycle
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Otto cycle
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Dual cycle
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None of these
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| 5. | What is the state at which phase change occurs without a change in pressure and temperature is known as ? | |
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Critical state
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Saturation state
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Equillibrium state
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None of these
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| 6. | What value of the dryness fraction (in %) represents the dry saturated state of vapour ? | |
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0
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25
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50
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100
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| 7. | Which factor contributes to the efficiency of the Otto cycle ? | |
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Compression ratio
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Operating pressure
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Operating temperature
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None of these
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| 8. | If a Carnot refrigerator has a COP of 6. What is the ratio of the lower to the higher absolute temperature ? | |
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1-6
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7-8
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6-7
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1-7
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| 9. | Which of the below stated are properties of a PMM-2 (1) When net work is equal to the heat absorbed and work efficiency is 100%. (2) Heat is exchanged from one heat reservoir only. (3) It violates Kelvin-Planck statement. (4) It is a hypothetical machine. ? | |
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(1), (2 ) and (4)
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(1), (3) and (4)
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(2), (3) and (4)
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(1), (2), (3) and (4)
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| 10. | Tonnes of refrigeration mean ________ ? | |
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the weight of the machine is one tonne.
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the weight of the refrigerant is one tonne.
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the rate of the heat extraction is one tone.
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None of these
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