Related Questions

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°
For centrifugal pump impeller, the maximum value of the vane exit angle is
A 10° to 15°
B 15° to 20°
C 20° to 25°
D 25° to 30°
Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation
A Pressure falls below the vapour pressure
B Pressure becomes very high
C Temperature becomes low
D All of the above
In order to avoid cavitation in centrifugal pumps
A The suction pressure should be high
B The delivery pressure should be high
C The suction pressure should be low
D The delivery pressure should be low
Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.
A NPSH required
B BHP required by the pump
C Head of the liquid pumped
D All of the above
The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.
A Inlet tip of a blade curves in a direction opposite to that
B Outlet tip of a blade curves in a direction opposite to that
C Inlet tip of a blade is towards the direction
D Outlet tip of a blade is towards the direction
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity
A One-half
B One-third
C Two-third
D Three-fourth
Cavitation occurs in a centrifugal pump when the suction pressure is
A Less than the vapour pressure of the liquid at that temperature
B Greater than the vapour pressure of the liquid at that temperature
C Equal to the vapour pressure
D Equal to the developed head
Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?
A Decrease in effect
B Increase in thrust
C Develops noise
D Develops high pressure
In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure __________ the vapor pressure of the liquid at the suction temperature.
A Lower than
B Higher than
C Equal to
D None of these

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