A. Increases the work done during delivery stroke
B. Decreases the work done during suction stroke
C. Does not change the work requirement of the pump
D. Increases the work done during suction stroke
Related Mcqs:
- The component of acceleration resulting due to unsteady nature of flow is called ____________ acceleration?
A. Normal
B. Local
C. Convective
D. Tangential - A mixed flow centrifugal pump_______________________?
A. Employs such an impeller, through which the flow is a combination of radial & axial flow
B. Mixes the two fluids before pumping them
C. Pumps the two fluids separately and then mixes them
D. Employs impellers in both the radial & axial directions - The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the_________________?
A. Discharge
B. Suction
C. Suction minus vapor pressure of the liquid at suction temperature
D. Discharge minus vapor pressure of the liquid at the discharge temperature - Velocity head on sudden enlargement in a horizontal pipe is converted into ______________ head?
A. Elevation
B. Pressure
C. Both A. & B.
D. Neither A. nor B. - A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, then the new head will be ______________ metres?
A. 2
B. 4
C. 8
D. 5.5 - The pressure head on sudden contraction in a horizontal pipe is converted into the _____________ head?
A. Elevation
B. Velocity
C. Both A. & B.
D. Neither A. nor B. - Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the ____________ head?
A. Manometric
B. Total
C. Static
D. Friction - When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?
A. Ejector
B. Blower
C. Injector
D. Airlift - Air vessel of a reciprocating pump is initially filled with___________________?
A. Atmospheric air
B. Compressed air
C. Water
D. None of these - Reciprocating pumps compared to centrifugal pumps__________________?
A. Deliver liquid at uniform pressure
B. Can handle slurries more efficiently
C. Are not subject to air binding
D. Can be operated with delivery valve closed
