Environmental Engineering Multiple Choice Questions on “Types of Pumps”.
1. Which of the following is the correct classification of pumps?
a) Physical principle of operation
b) Mechanical principle of operation
c) Chemical principle of operation
d) Biological principle of operation
Answer: b
Clarification: The pumps are classified on the basis of the mechanical operation of the principle, type of power and type of service.
2. Displacement pump is classified on the basis of _____________
a) Mechanical operation of principle
b) Type of power
c) Type of service
d) Efficiency
Answer: a
Clarification: Mechanical principle of operation is classified into displacement, centrifugal, air lift and miscellaneous pumps.
3. Which of the following pump is classified based on the type of service?
a) Displacement pump
b) Centrifugal pump
c) Deep well pump
d) Electric driven pump
Answer: c
Clarification: Pumps are of four types on the basis of type of service- low lift, high lift, deep well and booster pump.
4. Which of the following pump is based on the type of power?
a) Low lift pump
b) High lift pump
c) Air lift pump
d) Steam engine pump
Answer: d
Clarification: There are 3 types of pumps on the basis of type of power. They are – steam engine, diesel engine and electrically driven pump.
5. A booster pump is based on _____________
a) Mechanical operation of principle
b) Type of power
c) Type of service
d) Efficiency
Answer: c
Clarification: Booster pump is classified on the basis of type of service. They are used for increasing gas pressure, transferring high pressure gas, scavenging and charging gas cylinders.
6. Consider the following statements.
i. Capacity of the pump
ii. Number of pump units
iii. Discharge condition
The selection of a particular type of pump depends on which of the following?
a) i, ii, iii
b) i only
c) ii, iii
d) i, iii
Answer: a
Clarification: The selection of a particular type of pump depends on the capacity of pump, number of pump units, suction and discharge condition, type of drive, initial and final cost, lift, flexibility of operations and floor space requirements.
7. The centrifugal pump has a ______ flow.
a) Variable
b) Uniform
c) Continuous
d) Constant
Answer: c
Clarification: The centrifugal pump has a continuous flow. It does not give a constant discharge under variable head.
8. The speed at which the centrifugal pump runs (in r.p.m) is _____________
a) 200
b) 300
c) 500
d) 1200
Answer: c
Clarification: The speed at which the centrifugal pump runs lies in the range of 500 to 100 rates per minute (r.p.m). The direct connection of pump with driving machines is possible.
9. The maximum efficiency of a centrifugal pump is _____________
a) 50%
b) 60%
c) 85%
d) 100%
Answer: c
Clarification: The efficiency of the centrifugal pump lies between 40% and 85%. It depends on the head and discharge of the pump.
10. Based on the type of casing, the centrifugal pump is divided into _____ types.
a) 2
b) 3
c) 4
d) 5
Answer: a
Clarification: Based on the type of casing, the centrifugal pump is divided into the volute pump and turbine pump.