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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Which of the following fuels can be used in turbojet engines?

Methyl alcohol
High speed diesel oil
Liquid hydrogen
Kerosene

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Compressors, Gas Turbines and Jet Engines
Isothermal compression though most efficient, but is not practicable because

It is impossible in practice
Compressor has to run at very slow speed to achieve it
It does not increase pressure much
It requires very big cylinder

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Compressors, Gas Turbines and Jet Engines
Reciprocating air compressor is best suited for

Small quantity of air at high pressure
Large quantity of air at high pressure
Small quantity of air at low pressure
Large quantity of air at low pressure

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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)

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

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

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

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Compressors, Gas Turbines and Jet Engines
When air is to be compressed at a high pressure, then it is advantageous to use

Multistage compression with intercooling
None of these
Single stage compression
Multistage compression without intercooling

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