EVT Fire Pump Systems & Water Delivery Flashcards
6 cards from real EVT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 EVT Fire Pump Systems & Water Delivery flashcards as text
Which priming system type uses engine intake manifold vacuum to prime a centrifugal fire pump?
Answer: Exhaust primer
An exhaust primer uses engine exhaust gases to create a venturi effect that draws air from the pump casing to establish prime.
What is the maximum allowable lift for a centrifugal fire pump during a draft operation test per NFPA 1911?
Answer: 10 feet
NFPA 1911 requires pumps to successfully draft from a lift of 10 feet during service testing to verify the pump and priming system are functional.
What condition causes a fire pump to lose prime during drafting operations?
Answer: Air leak in the suction hose or pump packing
Air leaks in suction hose couplings, gaskets, or pump packing allow air to enter the intake side, breaking the vacuum needed to maintain prime.
What does the term 'net pump pressure' refer to in fire pump testing?
Answer: Discharge pressure minus intake pressure
Net pump pressure is the difference between discharge pressure and intake pressure, representing the actual pressure added by the pump regardless of supply conditions.
What is the purpose of a gate valve on a fire apparatus discharge outlet?
Answer: Control and shut off individual discharge lines
Gate valves on discharge outlets allow the pump operator to open, close, or throttle individual discharge lines independently during fire operations.
According to NFPA 1911, how frequently must fire apparatus pumps undergo a formal service test?
Answer: Annually
NFPA 1911 requires fire apparatus pumps to undergo a formal service test annually to verify they still meet their rated performance specifications.