A. air stream blocking the passage
B. motion of air at sonic velocity
C. unsteady, periodic and reversed flow
D. air stream not able to follow the blade contour
E. production of no air pressure
Related Mcqs:
- Surging phenomenon in centrifugal com-pressor depends on ___________________?
Pick up wrong statement ?
A. mass flow rate
B. pressure ratio
C. change in load
D. stagnation pressure at the outlet
E. all of the above - 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 - Propulsive efficiency is defined as ratio of___________________?
A. thrust power and fuel energy
B. engine output and propulsive power
C. propulsive power and fuel input
D. thrust power and propulsive power
E. none of the above - Isothermal compression though most efficient, but is not -practicable because_________________?
A. ityrequires very big cylinder
B. it does not increase pressure much
C. it is impossible in practice
D. compressor has to run at very slow speed to achieve it
E. it requires cylinder to be placed in water - An air compressor may be controlled by____________________?
A. throttle control B. clearance control
C. blow-off control
D. any one of the above
E. none of the above - 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 - The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is____________________?
A. heated
B. compressed air before entering the combustion chamber is heated
C. bled gas from turbine is heated and readmitted for complete expansion
D. exhaust gases drive the compressor
E. part of exhaust gases are heated and mixed up with atmospheric air to utilise exhaust heat - A jet engine works on the principle of conservation of____________________?
A. mass
B. energy
C. flow
D. linear momentum
E. angular momentum - Fighter bombers use following type of engine __________________?
A. turbo-jet
B. turbo-propeller
C. rocket
D. ram-jet ,
E. pulsojet - The efficiency of jet engine is__________________?
A. higher at ground
B. higher at high altitudes
C. same at all altitudes
D. higher at high speed
E. lower at low speed
