Compressors, Gas Turbines and Jet Engines - Mechanical Engineering Questions and Answers

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

W₁/(W₁ + W₂)

W₂/(W₁ + W₂)

(W₁ + W₂)/W₁

(W₁ + W₂)/W₂

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A compressor at high altitudes will require ________ power.

Same

Less

None of these

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In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into

Atmosphere

Vacuum

Discharge nozzle

Back to the compressor

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In jet engines the products of combustion after passing through the gas turbine are discharged into

Atmosphere

Back to the compressor

Discharge nozzle

Vacuum

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Pick up the false statement

Gas turbine is a self starting unit

Gas turbine does not require huge quantity of water like steam plant

Exhaust losses in gas turbine are high due to large mass flow rate

Overall efficiency of gas turbine plant is lower than that of a reciprocating engine

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The closed cycle in gas turbines

Provides greater flexibility

Provides lesser flexibility

In never used

Is used when gas is to be burnt

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Efficiency of gas turbine is increased by

Reheating

Inter cooling

Adding a regenerator

All of the above

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The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is

Low

High

Same

Low/high depending on make and type

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Air-fuel ratio in a jet engine will be of the order of

10: 1

15: 1

20: 1

60: 1