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Consider the following advantages of rotary pumps compared to reciprocating pumps: 1. Steady discharge which increases with decrease in head 2. Suitable for handling fluids with suspended solid particles 3. Less bulky than positive displacement pumps 4. Can be started with open delivery with least load Which of the above advantages are correct?

Consider the following advantages of rotary pumps compared to reciprocating pumps: 1. Steady discharge which increases with decrease in head 2. Suitable for handling fluids with suspended solid particles 3. Less bulky than positive displacement pumps 4. Can be started with open delivery with least load Which of the above advantages are correct? Correct Answer 1 ,2 and 3

The hydraulic machines which convert the mechanical energy into hydraulic energy are called pumps. If the mechanical energy is converted into pressure energy by means of the centrifugal force acting on the fluid, the hydraulic machine is called a centrifugal pump.

Centrifugal pumps

Reciprocating pumps

The discharge is continuous and smooth

The discharge is fluctuating and pulsating

It can handle a large quantity of liquid

It handles a small quantity of liquid only

It can be used for lifting highly viscous liquids

It is used only for lifting pure or less viscous liquids

It is used for large discharge through smaller heads

It is meant for a small discharge and high heads

Cost of a centrifugal pump is less as compared to reciprocating pump

Cost of a reciprocating pump is approximately four times the cost of a centrifugal pump

Centrifugal pump runs at high speed. They can be coupled to an electric motor

It runs at low speed. Speed is limited due to consideration of separation and cavitation

The operation of a centrifugal pump is smooth and without much noise. The maintenance cost is low

The operation of a reciprocating pump is complicated and with much noise. The maintenance cost is high.

It requires a smaller floor area and installation cost is low

It requires a larger floor area and installation cost is high

Efficiency is high

Efficiency is low

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