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.Management Sciences
Category: Compressors, Gas Turbines and Jet Engines
After-cooler is used to__________________?
A. cool the air
B. decrease the delivery temperature for ease in handling
C. cause moisture and oil vapour to drop out
D. reduce volume
E. increase pressure
The air entry velocity m a rocket as compared to aircraft is_________________?
A. same
B. more
C. less
D. zero
E. dependent on power and speed
In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________?
A. less
B. more
C. same
D. may be less or more depening upon speed
E. none of the above
The indicated work per unit mass of air delivered is___________________?
A. directly proportional to clearance volume
B. greatly affected by clearance volume
C. not affected by clearance volume
D. inversely proportional to clearance volume
Reciprocating air compressor is best suited for___________________?
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
As the turbine inlet temperature increases, the thermal efficiency of gas turbine for the optimum pressure ratio_____________________?
A. increases
B. decreases
C. remains same
D. first increases and then decreases
E. first decreases and then increases
Standard air is the air at_____________________?
A. atmospheric conditions at any specific location
B. 20°C and 1 kg/cm2 and relative humidity 36%
C. 0°C and standard atmospheric conditions
D. 15°C and 1 kg/cm2
E. 25°C, 1 kg/cm2 and RH of 60%.
Phenomenon of choking in compressor means __________________?
A. no flow of air
B. fixed mass flow rate regardless of pressure ratio
C. reducing mass flow rate with increase in pressure ratio
D. increased inclination of chord with air steam
E. does not occur
The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is_______________?
A. low
B. high
C. same
D. low/high depending on make and type
E. unpredictable
The compression ratio in a jet engine varies proportional to ____________________?
A. speed
B. speed
C. altitude
D. Vspeed
E. does not Vary
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