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Engineering Thermodynamics

Engineering Thermodynamics
The polytropic index (n) is given by

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

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Engineering Thermodynamics
No liquid can exist as liquid at

Zero pressure
273°K
Centre of earth
Vacuum

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Engineering Thermodynamics
A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is

-80 kJ
-40 kJ
-140 kJ
+60 kJ

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Engineering Thermodynamics
Reversed joule cycle is called

Bell Coleman cycle
Rankine cycle
Carnot cycle
Brayton cycle

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Engineering Thermodynamics
The value of cp/cv for air is

1
2.3
1.45
1.4

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Engineering Thermodynamics
The heat and mechanical energies are mutually convertible. This statement was established by

Joule
Charles
Boyle
None of these

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