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Engineering Thermodynamics

Engineering Thermodynamics
In closed cycle gas turbine, the air is compressed

Isothermally
None of these
Isentropically
Polytropically

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

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Engineering Thermodynamics
The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)

(T1/T2) - 1
1 - (T1/T2)
1 - (T2/T1)
1 + (T2/T1)

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Engineering Thermodynamics
A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is

Not possible
Theoretically possible
Cost will be very high
May be possible with lot of sophistications

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Engineering Thermodynamics
The isothermal and adiabatic processes are regarded as

Irreversible process
None of the listed here
Reversible process
Reversible or irreversible process

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Engineering Thermodynamics
The entropy of water at 0°C is assumed to be

1
-1
2

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MORE MCQ ON Engineering Thermodynamics

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