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Engineering Thermodynamics

Engineering Thermodynamics
According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.

Decreases
None of these
Remains constant
Increases

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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

30 Nm
3000 Nm
300,000 Nm
300 Nm

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Engineering Thermodynamics
A diathermic wall is one which

Encourages thermal interaction
Discourages thermal interaction
Permits thermal interaction
Prevents thermal interaction

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Engineering Thermodynamics
On weight basis, air contains following parts of oxygen

23
21
73
25

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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 - (1/ rγ - 1)
1 - rγ - 1

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Engineering Thermodynamics
The calorific value of gaseous fuel is expressed in

kJ/m2
kJ
kJ/kg
kJ/m3

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