A. Manometric
B. Mechanical
C. Volumetric
D. Overall
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. - 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 - 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. - Various efficiencies of a centrifugal pump are related as (where, εm = mechanical efficiency εv = volumetric efficiency. εma = manometric efficiency εo = overall efficiency) ?
A. ηma × ηm × ηv = ηo
B. ηm = ηv . ηma
C. ηma = ηm × ηv
D. ηv = ηm × ηma - 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 - A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?
A. Develops a lower head
B. Capacity is reduced
C. Requires more power
D. All A., B. and C. - 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 centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit E. to deliver water at a flow rate of 0.001 m3/s? The Fanning friction factor, f is 0.0062 ?
A. 10 m
B. 11 m
C. 11.8 m
D. 30 m - A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now_________________?
A. Increase
B. Decrease
C. Remain same
D. Data insufficient to predict - 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.
