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Which type of pump is most commonly used in municipal water treatment facilities?
A. Diaphragm pump
B. Centrifugal pump
C. Gear pump
D. Piston pump
Answer: B. Centrifugal pump
Rationale: Centrifugal pumps are the industry standard in water and wastewater
operations due to their simple design, continuous flow capabilities, and ability to handle
large volumes efficiently. Their reliability and relatively low maintenance requirements
make them ideal for municipal applications.
What is the primary purpose of pump priming?
A. To increase discharge pressure
B. To remove air from the pump casing and suction line
C. To lubricate the bearings
D. To cool the motor
Answer: B. To remove air from the pump casing and suction line
,Rationale: Priming eliminates air from the pump and suction line, allowing liquid to enter
the impeller. Without priming, a centrifugal pump cannot create the necessary suction to
move fluid effectively.
Which component converts mechanical energy into hydraulic energy?
A. Shaft sleeve
B. Mechanical seal
C. Impeller
D. Wear ring
Answer: C. Impeller
Rationale: The impeller rotates at high speed, imparting velocity to the liquid. This
kinetic energy is then converted into pressure energy within the volute or diffuser.
What does Net Positive Suction Head (NPSH) help prevent?
A. Overheating
B. Cavitation
C. Seal leakage
D. Excessive amperage
Answer: B. Cavitation
Rationale: Adequate NPSH ensures sufficient pressure at the pump suction, preventing
liquid vaporization and the formation of vapor bubbles that can damage pump
components.
A pump is operating but delivering no water. What is the most likely cause?
A. Excessive lubrication
B. Loss of prime
C. High discharge pressure
, D. Worn bearings
Answer: B. Loss of prime
Rationale: A centrifugal pump that has lost its prime contains air rather than water,
preventing the development of suction and resulting in no flow.
Which instrument is used to measure pump discharge pressure?
A. Tachometer
B. Flow meter
C. Pressure gauge
D. Thermometer
Answer: C. Pressure gauge
Rationale: Pressure gauges provide direct readings of discharge pressure, allowing
operators to monitor system performance and identify abnormal conditions.
Cavitation typically produces which audible symptom?
A. Whistling sound
B. Grinding or rattling noise
C. Clicking sound
D. Humming noise
Answer: B. Grinding or rattling noise
Rationale: Cavitation causes collapsing vapor bubbles that create a distinctive gravel-
like or rattling sound, often accompanied by vibration.
What is the function of a mechanical seal?
A. Increase flow rate