## calculate the flow in to or out of the air vessel when the crank angle is (a) 45°, and (b) 150°.

1.A double-acting reciprocating pump has the following data.

If an air vessel is fitted on the suction side, calculate the flow in to or out

of the air vessel when the crank angle is (a) 45°, and (b) 150°.

2. Following data pertain to a single-acting reciprocating pump installation pumping water:

Air vessels are fitted very near to the cylinder on the suction side and at a distance of 3 m from the cylinder on the delivery side. Estimate the power required to drive the pump by assuming the pump efficiency as 90%.

3. * In positive-displacement pumps, the slip can sometimes be negative when the actual discharge is greater than the theoretical discharge. This happens in

(a) small suction pipes coupled with low delivery head

(b) small suction pipes coupled with medium delivery head

(c) long suction pipes coupled with low delivery head

(d) long suction pipes coupled with medium delivery head

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