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Engineering Thermodynamics

Engineering Thermodynamics
Change in enthalpy of a system is the heat supplied at

Constant entropy
Constant volume
Constant pressure
Constant temperature

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Engineering Thermodynamics
Brayton cycle consists' of following four processes

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

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Engineering Thermodynamics
For the same compression ratio, the efficiency of dual combustion cycle is

Greater than Diesel cycle and less than Otto cycle
Less than Diesel cycle
Less than Diesel cycle and greater than Otto cycle
Greater than Diesel cycle

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

77
23
25
21

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Engineering Thermodynamics
According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as

None of these
Absolute temperature, if volume is kept constant
Temperature
Volume, if temperature is kept constant

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Engineering Thermodynamics
If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to

+ve
Anywhere between zero and infinity
-ve
Zero

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MORE MCQ ON Engineering Thermodynamics

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