A. increase velocity
B. make the flow stream-line
C. convert pressure energy into kinetic energy
D. convert kinetic energy into pressure energy
E. increase degree of reaction
Related Mcqs:
- The capacity of a compressor is 5 m /mih. 5 m /min refers to_______________?
A. standard air
B. free air
C. compressed air
D. compressed air at delivery pressure
E. air sucked - 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 - 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 - The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?
A. less
B. more
C. same
D. more/less depending on compressor capacity
E. unpredictable - During base load operation, the best method of controlling compressor is ___________________?
A. start-stop motor
B. constant speed unloader
C. relief valve
D. variable speed
E. none of the above - 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 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 - Axial flow compressor resembles____________________ ?
A. centrifugal pump
B. reciprocating pump
C. turbine
D. sliding vane compressor
E. none of the above - The vloumetric efficiency of compressor with increase in compression ratio will ___________________?
A. increase
B. decrease
C. remain same
D. may increase/decrease depending on clearance volume
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
