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Compressors, Gas Turbines and Jet Engines

Compressors, Gas Turbines and Jet Engines
Pick up wrong statement. Surging phenomenon in centrifugal compressor depends on

Pressure ratio
Mass flow rate
Change in load
Stagnation pressure at the outlet

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Compressors, Gas Turbines and Jet Engines
The work ratio of a gas turbine plant is defined as the ratio of

Actual heat drop and isentropic heat drop
Net work output and isentropic heat drop
Net work output and work done by turbine
Net work output and heat supplied

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Compressors, Gas Turbines and Jet Engines
With the decrease in compression ratio, the volumetric efficiency

First decrease and then increase
Decreases
Increases
Does not change

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Compressors, Gas Turbines and Jet Engines
Gas turbine blades are given a rake

Depending on the velocity
Equal to zero
Opposite to the direction of motion of blades
In the direction of motion of blades

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Compressors, Gas Turbines and Jet Engines
The air is delivered ________ in one revolution in case of a three lobbed rotor.

Three times
Six times
Four times
Two times

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Compressors, Gas Turbines and Jet Engines
The main purpose of reheating in gas turbine is to

Reduce turbine size
Increase power output
Increase speed
Increase temperature

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