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Engineering Thermodynamics

Engineering Thermodynamics
The compression ratio for Diesel engines is

5 to 8
15 to 20
20 to 30
3 to 6

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Engineering Thermodynamics
According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.

Do not change
None of these
Both (A) and (B)
Change

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Engineering Thermodynamics
The absolute zero pressure will be

At the center of the earth
At sea level
When molecular momentum of the system becomes zero
At the temperature of - 273 K

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Engineering Thermodynamics
Addition of heat at constant pressure to a gas results in

Raising its temperature
Raising its temperature and doing external work
Raising its volume
Raising its pressure

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Engineering Thermodynamics
In an irreversible process, there is a

Loss of heat
No loss of heat
Gain of heat
No gain of heat

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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

300,000 Nm
300 Nm
30 Nm
3000 Nm

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