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Which condition most directly leads to loss of pump prime?
A. Excessive engine RPM
B. Air leaks in suction line
C. High discharge pressure
D. Clean strainer
Answer: B
Rationale: Air entering the suction line disrupts the vacuum required for drafting,
causing the pump to lose prime.
What is the purpose of a vacuum test on a fire pump?
A. Measure discharge pressure
B. Check engine fuel efficiency
C. Verify pump integrity and sealing
D. Increase water flow
Answer: C
Rationale: A vacuum test ensures the pump can hold suction without leaking air,
confirming system integrity.
Which factor most affects maximum suction lift?
, A. Hose color
B. Atmospheric pressure
C. Engine oil level
D. Discharge valve position
Answer: B
Rationale: Atmospheric pressure determines how high water can be lifted into the
pump.
What is the primary function of an inline gauge?
A. Measure hose length
B. Monitor pressure at a specific point in the system
C. Control engine speed
D. Increase flow rate
Answer: B
Rationale: Inline gauges provide localized pressure readings within the system.
What is the safest method when increasing pump pressure?
A. Sudden throttle increase
B. Gradual RPM adjustment
C. Closing all valves quickly
D. Removing relief valve
Answer: B
Rationale: Gradual adjustments prevent water hammer and system shock.
What does overheating in a fire pump usually indicate?
A. Excess lubrication