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ENGINEERING THERMODYNAMICS

Engineering Thermodynamics
If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called

Adiabatic expansion
Parabolic expansion
Hyperbolic expansion
Free expansion

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Engineering Thermodynamics
The heat supplied to the gas at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant)

mcv (T2 - T1)
mR (T2 - T1)
mcp (T2 - T1)
mcp (T2 + T1)

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Engineering Thermodynamics
Those substances which have so far not been resolved by any means into other substances of simpler form are called

Atoms
Molecules
Compounds
Elements

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Engineering Thermodynamics
For same compression ratio and for same heat added

Efficiency depends on other factors
Otto cycle is more efficient than Diesel cycle
Diesel cycle is more efficient than Otto cycle
Both Otto and Diesel cycles are equally efficient

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Engineering Thermodynamics
The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)

δQ = T/ds
δQ = T.ds
None of the listed here
dQ = ds/T

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