CO Pump Installation Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which type of pump is commonly used for moving water from a well
to a storage tank?
A. Centrifugal pump
B. Submersible pump
C. Gear pump
D. Diaphragm pump
Rationale: Submersible pumps are designed to be installed inside wells and
are efficient for moving water to a storage tank.
2. What is the primary purpose of a pump’s check valve?
A. Increase water pressure
B. Reduce energy consumption
C. Prevent backflow
D. Control flow rate
Rationale: Check valves allow flow in one direction and prevent water from
flowing backward, protecting the system.
3. Which material is most resistant to corrosion for pump construction?
A. Aluminum
B. Stainless steel
C. Cast iron
D. Plastic
,Rationale: Stainless steel resists rust and corrosion, making it ideal for
pumps in water or chemical environments.
4. A pump’s flow rate is measured in:
A. Pounds per square inch (psi)
B. Gallons per minute (GPM)
C. Feet of head
D. Watts
Rationale: Flow rate is the volume of fluid moved per unit time, typically
expressed in GPM.
5. Which type of pump is best for high-head, low-flow applications?
A. Submersible pump
B. Vertical turbine pump
C. Centrifugal pump
D. Positive displacement pump
Rationale: Vertical turbine pumps are designed for lifting water from deep
wells where high head is required.
6. What is the purpose of a pump seal?
A. Increase flow
B. Prevent leakage
C. Reduce pressure
D. Enhance efficiency
Rationale: Pump seals prevent fluid from leaking out of the pump housing,
protecting both the pump and surroundings.
7. Which component converts mechanical energy into fluid energy in a
centrifugal pump?
A. Motor
B. Shaft
C. Impeller
D. Casing
Rationale: The impeller accelerates the fluid outward, converting
mechanical energy into kinetic energy and then pressure energy.
, 8. Cavitation in a pump is caused by:
A. Excessive flow
B. High efficiency
C. Formation of vapor bubbles due to low pressure
D. Overheating
Rationale: Cavitation occurs when local pressure drops below the vapor
pressure, forming bubbles that can damage the pump.
9. Which type of pump is suitable for handling sludge or thick liquids?
A. Centrifugal pump
B. Diaphragm pump
C. Submersible pump
D. Booster pump
Rationale: Diaphragm pumps can handle viscous or slurry fluids without
clogging or damage.
10. What is the typical power source for most residential water
pumps?
A. Steam
B. Electricity
C. Gasoline only
D. Solar
Rationale: Electric motors are the most common source of power for
residential water pumps due to efficiency and reliability.
11. A booster pump is primarily used to:
A. Filter water
B. Increase water pressure
C. Reduce water flow
D. Heat water
Rationale: Booster pumps raise water pressure in systems with low supply
pressure to ensure proper delivery.
12. What is the function of a pump strainer?
A. Increase pressure
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which type of pump is commonly used for moving water from a well
to a storage tank?
A. Centrifugal pump
B. Submersible pump
C. Gear pump
D. Diaphragm pump
Rationale: Submersible pumps are designed to be installed inside wells and
are efficient for moving water to a storage tank.
2. What is the primary purpose of a pump’s check valve?
A. Increase water pressure
B. Reduce energy consumption
C. Prevent backflow
D. Control flow rate
Rationale: Check valves allow flow in one direction and prevent water from
flowing backward, protecting the system.
3. Which material is most resistant to corrosion for pump construction?
A. Aluminum
B. Stainless steel
C. Cast iron
D. Plastic
,Rationale: Stainless steel resists rust and corrosion, making it ideal for
pumps in water or chemical environments.
4. A pump’s flow rate is measured in:
A. Pounds per square inch (psi)
B. Gallons per minute (GPM)
C. Feet of head
D. Watts
Rationale: Flow rate is the volume of fluid moved per unit time, typically
expressed in GPM.
5. Which type of pump is best for high-head, low-flow applications?
A. Submersible pump
B. Vertical turbine pump
C. Centrifugal pump
D. Positive displacement pump
Rationale: Vertical turbine pumps are designed for lifting water from deep
wells where high head is required.
6. What is the purpose of a pump seal?
A. Increase flow
B. Prevent leakage
C. Reduce pressure
D. Enhance efficiency
Rationale: Pump seals prevent fluid from leaking out of the pump housing,
protecting both the pump and surroundings.
7. Which component converts mechanical energy into fluid energy in a
centrifugal pump?
A. Motor
B. Shaft
C. Impeller
D. Casing
Rationale: The impeller accelerates the fluid outward, converting
mechanical energy into kinetic energy and then pressure energy.
, 8. Cavitation in a pump is caused by:
A. Excessive flow
B. High efficiency
C. Formation of vapor bubbles due to low pressure
D. Overheating
Rationale: Cavitation occurs when local pressure drops below the vapor
pressure, forming bubbles that can damage the pump.
9. Which type of pump is suitable for handling sludge or thick liquids?
A. Centrifugal pump
B. Diaphragm pump
C. Submersible pump
D. Booster pump
Rationale: Diaphragm pumps can handle viscous or slurry fluids without
clogging or damage.
10. What is the typical power source for most residential water
pumps?
A. Steam
B. Electricity
C. Gasoline only
D. Solar
Rationale: Electric motors are the most common source of power for
residential water pumps due to efficiency and reliability.
11. A booster pump is primarily used to:
A. Filter water
B. Increase water pressure
C. Reduce water flow
D. Heat water
Rationale: Booster pumps raise water pressure in systems with low supply
pressure to ensure proper delivery.
12. What is the function of a pump strainer?
A. Increase pressure
