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Engineering Thermodynamics

Engineering Thermodynamics
The compression ratio for Diesel engines is

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

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Engineering Thermodynamics
The area under the temperature-entropy curve (T – s curve) of any thermodynamic process represents

Either heat absorbed or heat rejected
None of the listed here
Heat rejected
Heat absorbed

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

Steam
Perfect gas
Air
Ordinary gas

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Engineering Thermodynamics
When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

Zeroth law of thermodynamics
Kelvin Planck's law
First law of thermodynamics
Second law of thermodynamics

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Engineering Thermodynamics
The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)

v1/v2
(v1 + v2)/v1
(v1 + v2)/v2
v2/v1

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Engineering Thermodynamics
In an isothermal process

There is no change in temperature
There is no change in enthalpy
There is no change in internal energy
All of the listed here

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