Question

In a centrifugal pump, the regulating valve is provided on the-
(A) Casing
(B) Delivery pipe
(C) Suction pipe
(D) Impeller

Answer 1

Hint: Centrifugal pumps are used to induce flow or raise a liquid from a low level to a high level. These pumps work on a very simple mechanism. A centrifugal pump converts rotational energy, often from a motor, to energy in a moving fluid.

Complete step by step answer:
Regulating valves controls the flow liquid from the pump to the delivery pipe so it is connected in the delivery tube.
It is usually a sluice type of valve
A centrifugal pump is a mechanical device designed to move a fluid by means of the transfer of rotational energy from one or more driven rotors, called impellers. Fluid enters the rapidly rotating impeller along its axis and is cast out by centrifugal force along its circumference through the impeller’s vane tips. The action of the impeller increases the fluid’s velocity and pressure and also directs it towards the pump outlet. The pump casing is specially designed to constrict the fluid from the pump inlet, direct it into the impeller and then slow and control the fluid before discharge.
A sluice valve is a valve that opens by lifting a barrier (gate) out of the path of the fluid. Gate valves require very little space along the pipe axis and hardly restrict the flow of fluid when the gate is fully opened.

Hence Option-B is correct.

Note: Controlling of the flow of liquid from pump to the delivery pipe is done by regulating the valve to induce flow or raise a liquid from a low level to a high level and it is connected to the delivery pipe and usually it is made up of a sluice type of valve.