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Engineering Thermodynamics

Engineering Thermodynamics
In an isothermal process, the internal energy

Increases
First increases and then decreases
Remain constant
Decreases

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Engineering Thermodynamics
Carnot cycle efficiency depends upon

Working condition
Properties of the medium/substance used
Temperature range of operation
Condition of engine

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Engineering Thermodynamics
Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?

O₂, N₂, water vapour
O₂, N₂, steam, CO₂
SO₂, NH₃, CO₂, moisture
O₂, N₂, H₂, air

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Engineering Thermodynamics
For reversible adiabatic process, change in entropy is

Maximum
Negative
Zero
Minimum

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Engineering Thermodynamics
For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.

Greater than
Equal to
None of these
Less than

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Engineering Thermodynamics
The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)

δQ = T/ds
δQ = T.ds
None of the listed here
dQ = ds/T

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