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Hydraulic pump will start pumping only when pressure head is ______ manometric head.
1. equal to
2. greater than
3. lower than
4. greater than or equal to

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Correct Answer - Option 4 : greater than or equal to

A manometric head is defined as the head against which a centrifugal pump has to work. 

Manometric head also measured as

Manometric head  = Head imparted by the impeller to water – loss of head in the pump.

where,

Head imparted by the impeller to water = Manometric head + Loss of head in the pump.

Hence the Hydraulic pump will start pumping only when the pressure head is greater than or equal to the manometric head.

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