Discharge of a centrifugal pump is
A. Directly proportional to diameter of its impeller
B. Inversely proportional to diameter of its impeller
C. Directly proportional to (diameter)2 of its impeller
D. Inversely proportional to (diameter)2 of its impeller
Answer: Option D
This Question Belongs to Mechanical Engineering >> Hydraulics And Fluid Mechanics In ME
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A flow in which the quantity of liquid flowing per second is constant, is called __________ flow.
A. Steady
B. Streamline
C. Turbulent
D. Unsteady
A hydraulic ram is a device used to
A. Store the energy of water
B. Increase the pressure of water
C. To lift water from deep wells
D. To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height
A. The weight of the body
B. More than the weight of the body
C. Less than the weight of the body
D. Weight of the fluid displaced by the body
Option c is correct..
Q=A.V=pi.d^2/4.v
C. Directly proportional to (diameter)² of its impeller
Ans should be c.
Discharge of centrifugal pump is Q = area* velocity of flow.
Q = (pi)(D1)(B1)(VF1) = (PI)(D2)(B2)(VF2).
Where B1 and B2 are width of impeller at inlet and outlet and B1 and B2 are diameter of impeller at inlet and outlet and VF1 and VF2 are velocity of flow at inlet and outlet.
The discharge flow rate of a centrifugal pump is directly proportional to diameter. Discharge head is directly proportional to the square of the diameter. And power is directly proportional to the cube of the diameter. You can understand all this with the help of affinity laws.
The right answer is C
Option A is the right one as Q= pi*D*B*Vf is the equation for discharge