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Engineering Thermodynamics

Engineering Thermodynamics
Which law states that the internal energy of a gas is a function of temperature?

There is no such law
Joule's law
Charles' law
Boyle's law

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Engineering Thermodynamics
The fuel mostly used in steam boilers is

Non-coking bituminous coal
Brown coal
Peat
Coking bituminous coal

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Engineering Thermodynamics
The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is

23.97 bar
34.81 bar
25 bar
26.03 bar

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Engineering Thermodynamics
The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)

1 - (1/r) γ - 1/ γ
1 - rγ - 1
rγ - 1
1 - (1/r) γ/γ - 1

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Engineering Thermodynamics
If value of n is infinitely large in a polytropic process pVn = C, then the process is known as constant

Volume
Temperature
Enthalpy
Pressure

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Engineering Thermodynamics
A gas is compressed in a cylinder by a movable piston to a volume one half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be

3000 Nm
300,000 Nm
300 Nm
30 Nm

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