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Engineering Thermodynamics

Engineering Thermodynamics
In closed cycle gas turbine, the air is compressed

Polytropically
Isothermally
Isentropically
None of these

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Engineering Thermodynamics
Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant)

cv = R/ γ-1
cv/ cp =R
cp - cv = R
Both (B) and (C)

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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 efficiency of Stirling cycle is __________ Carnot cycle.

Greater than
Less than
Equal to
None of these

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Engineering Thermodynamics
The process is adiabatic, if the value of n in the equation pvn = C, is

Zero
∝
One
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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