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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The following property is most important for material used for gas turbine blade

Corrosion resistance
Toughness
Fatigue
Creep

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Compressors, Gas Turbines and Jet Engines
Separators are generally used in air compressor installations

Before first stage suction
Before the inter-cooler
Between the after-cooler and receiver
After the inter-cooler

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Compressors, Gas Turbines and Jet Engines
For maximum work, the reheating should be done to an intermediate pressure of (Where p₁ = Maximum pressure, and p₂ = Minimum pressure)

(p₁ + p₂)/2
p₁/p₂
(p₁ - p₂)/2
p₁ p₂

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Compressors, Gas Turbines and Jet Engines
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

Vt > Vo
U < Vo
Vi = Vo
V = Uo

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Compressors, Gas Turbines and Jet Engines
Maximum work is done in compressing air when the compression is

Adiabatic
Polytropic
None of these
Isothermal

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Compressors, Gas Turbines and Jet Engines
The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

0.75
0.85
0.9
0.99

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MORE MCQ ON Compressors, Gas Turbines and Jet Engines

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