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Engineering Thermodynamics

Engineering Thermodynamics
In closed cycle gas turbine, the air is compressed

Isentropically
Polytropically
Isothermally
None of these

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Engineering Thermodynamics
A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is

Theoretically possible
May be possible with lot of sophistications
Cost will be very high
Not possible

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Engineering Thermodynamics
The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)

Q1 - 2 = dU/W1 - 2
Q1 - 2 = dU + W1 - 2
Q1 - 2 = dU - W1 - 2
Q1 - 2 = dU × W1 - 2

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Engineering Thermodynamics
The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of

0.224 liters
22.4 liters
224 liters
2.24 liters

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Engineering Thermodynamics
Which of the following processes are thermodynamically reversible?

Constant volume and constant pressure
Isothermal and adiabatic
Free expansion
Throttling

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Engineering Thermodynamics
Which of the following gas has a minimum molecular mass?

Nitrogen
Methane
Hydrogen
Oxygen

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