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Engineering Thermodynamics

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

25
23
21
77

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Engineering Thermodynamics
In an isothermal process, the internal energy

Increases
First increases and then decreases
Remain constant
Decreases

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Engineering Thermodynamics
The unit of pressure in S.I. units is

Pascal
Dyne per square cm
mm of water column
kg/cm²

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Engineering Thermodynamics
If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

More
Equal
Less
Depends on other factors

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Engineering Thermodynamics
In a reversible adiabatic process, the ratio of T1/T2 is equal to

(p1/p2)γ - 1/ γ
(v1/v2)γ - 1/ γ
(v2/v1)γ - 1/ γ
(p2/p1)γ - 1/ γ

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Engineering Thermodynamics
Otto cycle consists of following four processes

Two isothermal and two isentropic
Two isentropic and two constant pressures
Two isentropic, one constant volume and one constant pressure
Two isentropic and two constant volumes

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