Category: Compressors, Gas Turbines and Jet Engines

A. large quantity of air at high pressure
B. small quantity of air at high pressure
C. small quantity of air at low pressure
D. large quantity of air at low pressure
E. any one of the above

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

A. isothermally
B. adiabatically
C. isentropically
D. isochronically
E. as per law pV

A. higher
B. lower
C. same
D. depends on on odier considerations
E. unpredictable

A. These are used to dampen pulsations ,
B. These act as reservoir to- take care of sudden demands
C. These increase compressor efficiency
D. These knock out some oil and moisture
E. These reduce frequent on/off operation of compressors

A. increases with increase in compression ratio
B. decreases with increase in compression ratio
C. is not dependent upon compressin ratio
D. may increase/decrease depending on compressor capacity
E. unpredictable

A. collect more air
B. convert kinetic energy of air into pres-sure energy
C. provide robust structure
D. beautify the shape
E. none of the above

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

A. isothermal H.P/indicated H.R
B. isothermal H.P./shaft H.R
C. total output/air input
D. compression work/motor input
E. none Of the above

A. large gas turbines use radial inflow turbines
B. gas turbines have their blades similar to steam turbine
C. gas .turbine’s blade will appear as impulse section at the hub and as a reaction section at tip
D. gas turbines use both air and liquid cooling
E. all of the above are correct.