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

 

find the cost of your paper

Design a hydrocooling unit that can cool fruits and vegetables from 30 to 5°C at a rate of 20,000 kg/h under the following conditions

Design a hydrocooling unit that can cool fruits and vegetables from 30 to 5°C at a rate of 20,000 kg/h under the following conditions: The unit will be of flood….

Design an experiment to show the effects of marination on the textural properties of the meat.

The most common application of using combined effects of acids, salts, and enzymes on protein denaturation in food preparation is meat marination. Marination enriches the flavor, increases the water retention, and….

obtain the optimum loading of the two generating units in Problem 3.1 using the following technique

As an exercise, obtain the optimum loading of the two generating units in Problem 3.1 using the following technique. The two units are to deliver 100 MW. Assume both units….