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
Related Mcqs:
- 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 A., B. and C. - In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes_______________?
A. Less than atmospheric pressure
B. More than liquid vapor pressure
C. Less than liquid vapor pressure
D. More than atmospheric pressure - Erosion and pits formation on the impeller of a centrifugal pump may be due to________________?
A. Cavitation
B. Low speed of impeller
C. Its operation with delivery valve closed for considerable time after starting the pump
D. Off centering of pump with motor - In case of a centrifugal pump, the theoretical head developed is dependent on the _____________ the impeller?
A. Speed of
B. Diameter of
C. Fluid velocity leaving
D. All A., B. and C. - Which is the correct relationship for a centrifugal pump? (Where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm) ?
A. D = 1840 H0.5/N
B. D = 1840 N/H0.5
C. H = 1840 D0.5/N
D. D = 1840 H/N - At a constant speed of the centrifugal pump, it‟s _____________ the impeller diameter?
A. Capacity varies directly with
B. Head varies as the square of
C. Horsepower varies as the cube of
D. All A., B. and C. - In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the _____________ efficiency?
A. Manometric
B. Mechanical
C. Volumetric
D. Overall - Theoretical head developed by a centrifugal pump does not depend upon the _____________ the impeller?
A. Radius of
B. Speed of
C. Fluid velocity leaving
D. None of these - With a constant diameter impeller of a centrifugal pump _____________________?
A. Its capacity varies directly as the square of speed
B. Head varies as the square of speed
C. Horsepower input varies as the square of speed
D. Head varies as the speed - The maximum head that can be developed by a single impeller is _____________ ft?
A. 25
B. 100
C. 250-300
D. 1000
