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Engineering Thermodynamics

Engineering Thermodynamics
In a Carnot cycle, heat is transferred at

Constant enthalpy
Constant temperature
Constant volume
Constant pressure

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Engineering Thermodynamics
A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

54 kJ
30 kJ
84 kJ
114 kJ

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Engineering Thermodynamics
When the gas is cooled at constant pressure,

Both temperature and volume decreases
Both temperature and volume increases
Its temperature increases but volume decreases
Its volume increases but temperature decreases

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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

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

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Engineering Thermodynamics
The natural solid fuel is

Coke
Wood
Anthracite coal
Pulverised coal

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Engineering Thermodynamics
The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 - (1/ rγ - 1)
1 + rγ - 1
1 - rγ - 1
1 + (1/ rγ - 1)

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MORE MCQ ON Engineering Thermodynamics

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