# Environmental Engineering Questions and Answers – Reciprocating Pump

This set of Environmental Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Reciprocating Pump”.

1. The reciprocating pump has a ______ flow.
a) Pulsating
b) Uniform
c) Continuous
d) Constant

Explanation: The reciprocating pump has a continuous flow. It has a constant discharge even if head on the delivery side varies.

2. The speed at which the reciprocating pump runs (in m/min) is _____________
a) 28
b) 90
c) 100
d) 120

Explanation: The reciprocating pump runs at a low speed. Its speed is less than 30m/min. If they are connected to driving machines, speed reducing devices are necessary.

3. The maximum efficiency of a reciprocating pump is _____________
a) 50%
b) 60%
c) 85%
d) 100%

Explanation: The efficiency of the reciprocating pump lies between 40% and 85%. Long stroke engines have 85% efficiency while smaller pumps have 40%.

4.In which type of pump, the liquid is in contact with both sides of the plunger?
a) Single acting reciprocating pump
b) Double acting reciprocating pump
c) Single cylinder pump
d) Booster pump

Explanation: At the double acting reciprocating pump, the liquid is in contact with both sides of the plunger. It has two suction and deliver pipes having appropriate valves.

5. Based on the number of cylinders, the reciprocating pump is divided into ____ types.
a) 2
b) 3
c) 4
d) 5

Explanation: the reciprocating pump is divided into 5 types on the basis of number of cylinders. It includes single cylinder, double cylinder, triple cylinder, duplex double action and quintuplex pump.
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6. Which type of reciprocating pump has a 1200 crank?
a) Single cylinder pump
b) Double cylinder pump
c) Triple cylinder pump
d) Duplex double action pump

Explanation: In a Triple cylinder reciprocating pump, each cylinder has its own suction and delivery pipes and has a 1200 crank.

7. Quintuplex pump has a crank of ____
a) 60o
b) 72o
c) 120o
d) 1800o

Explanation: Quintuplex pump has five single acting cylinders with separate suction and delivery having 72o crank.

8. The number of valves required in rotary pump is _____________
a) 0
b) 1
c) 2
d) 3

Explanation: No valves are required in rotary pump and the flow is continuous. Gear, Lobe and Vane pumps are the examples of rotary pump.

9. Consider the following statement regarding Reciprocating pump.
i. High initial cost
ii. Requires a small space
iii. Less power required
Which of the following is/are incorrect statements?
a) Only 1
b) Only 2
c) Only 3
d) 2, 3

Explanation: The reciprocating pump has high initial and maintenance cost, more power required and required large space.

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