## Reduce the speed of the drive to the lowest possible value

1. As compared to single-acting pump, a double-acting reciprocating pump has

nearly

(a) double head (b) double efficiency

(c) double flow (d) double speed

O6.10 ***If pump NPSHR is not satisfied,

(a) efficiency will be low

(b) cavitation will take place

(c) the pump will not develop necessary head

(d) the pump will consume excessive power

2. A reciprocating water pump delivers 100 litres of water per second against a suction head of 5 m and a delivery head of 15 m. If the overall efficiency of the pump is 80%, the required power to drive the pump is near about

(a) 13 kW (b) 20 kW (c) 25 kW (d) 30 kW

3. Saving of work done in overcoming frictional resistance in a pipe (suction/ delivery) by fitting an air vessel to a double-acting reciprocating pump is

(a) 49.2% (b) 84.8% (c) 39.2% (d) 66.6%

4. Consider the following statements: Before starting a reciprocating pump, the following actions have to be performed:

(1) Completely close the delivery pipe valve

(2) Prime the pump

(3) Reduce the speed of the drive to the lowest possible value

(4) Completely open the delivery valve

The correct statements are

(a) 1 and 2 (b) 2 and 4 (c) 1,2 and 3 (d) 2, 3 and 4

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