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Engineering Thermodynamics

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

Isentropically
Polytropically
None of these
Isothermally

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

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Engineering Thermodynamics
The polytropic index (n) is given by

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

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Engineering Thermodynamics
In an isothermal process

There is no change in internal energy
There is no change in enthalpy
There is no change in temperature
All of the listed here

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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
A series of operations, which takes place in a certain order and restore the initial conditions at the end, is known as

Irreversible cycle
Thermodynamic cycle
None of these
Reversible cycle

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