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Engineering Thermodynamics

Engineering Thermodynamics
The sum of internal energy (U) and the product of pressure and volume (p.v) is known as

Entropy
Power
Enthalpy
Work done

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Engineering Thermodynamics
When the gas is heated at constant pressure, the heat supplied

Increases the internal energy of the gas
Both (B) and (C)
Does some external work during expansion
Increases the temperature of the gas

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Engineering Thermodynamics
The efficiency of a Carnot engine depends on

Temperatures of source and sink
Working substance
Size of engine
Design of engine

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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)

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

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Engineering Thermodynamics
For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)

P/T = constant, if v is kept constant
P v = constant, if T is kept constant
T/P = constant, if v is kept constant
V/T = constant, if p is kept constant

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Engineering Thermodynamics
The more effective way of increasing efficiency of Carnot engine is to

Decrease lower temperature
Increase higher temperature
Decrease higher temperature
Increase lower temperature

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MORE MCQ ON Engineering Thermodynamics

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