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Engineering Thermodynamics

Engineering Thermodynamics
The polytropic index (n) is given by

log (p1p2)/log (v1v2)
log [(p1v1)/(p2v2)]
log (p2/ p1)/log (v1/ v2)
log (v1/ v2)/ log (p1/p2)

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Engineering Thermodynamics
The reading of the pressure gauge fitted on a vessel is 25 bar. The atmospheric pressure is 1.03 bar and the value of 'g' is 9.81 m/s2. The absolute pressure in the vessel is

25 bar
26.03 bar
23.97 bar
34.81 bar

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Engineering Thermodynamics
Energy can neither be created nor destroyed but can be converted from one form to other is inferred from

Basic law of thermodynamics
First law of thermodynamics
Zeroth low of thermodynamic
Second law to thermodynamics

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Engineering Thermodynamics
Diesel cycle consists of following four processes

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

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Engineering Thermodynamics
The absolute zero pressure will be

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

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

73
23
25
21

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