Engineering Thermodynamics
Gases have

Under some conditions one value and sometimes two values of specific heat
Only one value of specific heat
No value of specific heat
Two values of specific heat

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Engineering Thermodynamics
Extensive property of a system is one whose value

Is not dependent on the path followed but on the state
Does not depend on the mass of the system, like temperature, pressure, etc.
Depends on the mass of the system like volume
Is dependent on the path followed and not on the state

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Engineering Thermodynamics
Which of the following is the correct statement?

All the reversible and irreversible engines have the same efficiency.
Irreversible engines have maximum efficiency.
All the reversible engines have the same efficiency.
All engines are designed as reversible in order to obtain maximum efficiency.

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