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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
The most efficient method of compressing air is to compress it

Isothermally
Isochronically
Adiabatically
Isentropically

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Compressors, Gas Turbines and Jet Engines
The type of rotary compressor used in aeroplanes, is of

Centrifugal type
None of these
Axial flow type
Radial flow type

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Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature

0.01
0.05
0.005
0.001

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Compressors, Gas Turbines and Jet Engines
Mining industry usually employs following motive power

Diesel engine
Compressed air
C. electric motor
Petrol engine

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Compressors, Gas Turbines and Jet Engines
The efficiency of the vane blower is (where W₁ = Workdone due to compression, and W₂ = Workdone due to back flow)

(W₁ + W₂)/W₁
W₂/(W₁ + W₂)
(W₁ + W₂)/W₂
W₁/(W₁ + W₂)

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Compressors, Gas Turbines and Jet Engines
Standard air is the air at ___ and relative humidity of 36 percent.

0.1 bar and 40°C
1 bar and 20°C
0.1 bar and 20°C
1 bar and 40°C

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