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31. The optimum value of vane exit angle for a centrifugal pump impeller is_________________?
A. 10-15°
B. 20-25°
C. 30-40°
D. 50-60°
E. 80-90°.
32. In centrifugal pumps, maximum efficiency is obtained when the blades are_________________?
A. straight
B. bent forward
C. bent backward
D. radial
E. given aerofoil section
33. In a centrifugal pump, the liquid enters the pump__________________?
A. at the top
B. at the bottom
C. at the center
D. from sides
E. none of the above
34. Low specific speed of a pump implies it is____________________?
A. centrifugal pump
B. mixed flow pump
C. axial flow pump
D. any one of the above
E. none of the above
35. For small discharge at high pressure, following pump is preferred_____________________?
A. centrifugal
B. axial flow
C. mixed flow
D. propeller
E. reciprocating
36. The horse power required in above case will be___________________?
A. same
B. 0.75 B.H.P.
C. B.H.P./0.75
D. 1.5 B.H.P.
E. none of the above
37. Motion of a liquid in a volute casing of a centrifugal pump is an example of____________________?
A. rotational flow
B. radial
C. forced spiral vortex flow
D. forced cylindrical vortex flow
E. spiral vortex flow
38. Medium specific speed of a pump implies it is_________________?
A. centrifugal pump
B. mixed flow pump
C. axial flow pump
D. any one of the above
E. none of the above
39. Indicator diagram of a reciprocating pump is a graph between________________?
A. flow vs swept volume
B. pressure in cylinder vs swept volume
C. flow vs speed
D. pressure vs speed
E. swept volume vs speed
40. Any change in load is adjusted by adjusting following parameter on turbine______________?
A. net head
B. absolute velocity
C. blade velocity
D. flow
E. relative velocity of flow at inlet