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Gas Turbines and Jet Engines

The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?

The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?

A. slip factor
B. velocity factor
C. velocity coefficient
D. blade effectiveness

The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________? Read More »

Compressors, Gas Turbines and Jet Engines

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________?

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________?

A. 2 kg/cm2
B. 6 kg/cm2
C. 10 kg/cm2
D. 14.7 kg/cm2
E. none of the above

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________? Read More »

Compressors, Gas Turbines and Jet Engines

Pick up the wrong statement about advantages of multistage compression____________________?

Pick up the wrong statement about advantages of multistage compression____________________?

A. better lubrication is possible advantages of multistage
B. more loss of air due to leakage past the cylinder
C. mechanical balance is better
D. air can be cooled perfectly in between
E. more uniform torque, light cylinder and saving in work

Pick up the wrong statement about advantages of multistage compression____________________? Read More »

Compressors, Gas Turbines and Jet Engines

For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________?

For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________?

A. increase
B. decrease
C. remain unaffected
D. other factors control it
E. unpredictable

For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________? Read More »

Compressors, Gas Turbines and Jet Engines

The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________?

The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________?

A. 0.1%
B. 0.5%
C. 1%
D. 5%
E. 10%.

The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________? Read More »

Compressors, Gas Turbines and Jet Engines

For minimum work in multistage compression, assuming same index of compression in all stages_________________?

For minimum work in multistage compression, assuming same index of compression in all stages_________________?

A. work done in first stage should be more
B. work done in subsequent stages should increase
C. work done in subsequent stages should decrease
D. work done in all stages should be equal
E. work done in any stage is no criterion for minimum work but depends on other factors

For minimum work in multistage compression, assuming same index of compression in all stages_________________? Read More »

Compressors, Gas Turbines and Jet Engines

Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________?

Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________?

A. less power requirement
B. better mechanical balance
C. less loss of air due to leakage past the cylinder
D. more effective lubrication
E. lower volumetric efficiency

Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________? Read More »

Compressors, Gas Turbines and Jet Engines

For supplying intermittent small quantity of air at high pressure, following compressor is best suited__________________?

For supplying intermittent small quantity of air at high pressure, following compressor is best suited__________________?

A. centrifugal
B. reciprocating
C. axial
D. screw
E. turbo jet

For supplying intermittent small quantity of air at high pressure, following compressor is best suited__________________? Read More »

Compressors, Gas Turbines and Jet Engines