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Engineering Thermodynamics

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

Isothermally
Polytropically
None of these
Isentropically

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Engineering Thermodynamics
In a no flow reversible process for which p = (-3V + 15) × 105 N/m², V changes from 1 m3 to 2 m3. The work done will be about

10 × 10⁵ joules
1 × 10⁵ joules
10 × 10⁵ kilo joules
100 × 10⁵ joules

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Engineering Thermodynamics
Work done is zero for the following process

Throttling
All of the listed here
Constant volume
Free expansion

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Engineering Thermodynamics
One Joule (J) is equal to

1 kN-m
10 N-m/s
10 kN-m/s
1 N-m

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Engineering Thermodynamics
For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order

Otto cycle, Diesel cycle, Dual cycle
Diesel cycle, Otto cycle, Dual cycle
Dual cycle, Otto cycle, Diesel cycle
Dual cycle, Diesel cycle, Otto cycle

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Engineering Thermodynamics
The behavior of super-heated vapour is similar to that of

Perfect gas
Steam
Air
Ordinary gas

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