Answer 10 free questions

EVT Ambulance: 10 free questions

Tap an answer to see if you're right and why, or switch to Timed and get scored at the end. Each answer is also under its question.

1. EVT E0 Maintenance, Inspection & Testing

   A Type I ambulance has a manufacturer's GVWR of 14,500 lb. Under the braking-performance requirements of 49 CFR 393.52, its service brake system must be capable of producing a deceleration of at least:

   A11 ft/s² B14 ft/s² C17 ft/s² D21 ft/s²
   Show answer

   Answer: B. 14 ft/s²

   49 CFR 393.52 requires single-unit vehicles with a GVWR over 10,000 lb to achieve at least 14 ft/s². The 17 ft/s² figure applies to lighter single-unit vehicles (10,000 lb or less) and 21 ft/s² to passenger cars, so those overstate the requirement for this chassis.

   • A: 11 ft/s² falls short of the required 14 ft/s²
   • C: 17 ft/s² applies to single-unit vehicles 10,000 lb or less
   • D: 21 ft/s² is the deceleration standard for passenger cars
2. EVT E1 Ambulance Design & Performance

   The Federal ambulance specification KKK-A-1822 (the "Star-of-Life" specification) is developed and administered by which agency?

   AThe National Fire Protection Association (NFPA) BThe Food and Drug Administration (FDA) CThe General Services Administration (GSA) DThe National Highway Traffic Safety Administration (NHTSA)
   Show answer

   Answer: C. The General Services Administration (GSA)

   KKK-A-1822 is a Federal specification written and maintained by the GSA. NFPA is the distractor because it publishes the separate consensus standard NFPA 1917 (now NFPA 1900) for automotive ambulances, but it does not administer the KKK Federal spec.

   • A: NFPA writes consensus standard 1917, not the KKK Federal spec
   • B: FDA regulates medical devices, not vehicle Federal specifications
   • D: NHTSA issues FMVSS safety standards, not the KKK spec
3. EVT E2 Ambulance Electrical Systems

   When performing a voltage-drop test on an ambulance 12V circuit, the test must be conducted while the circuit is in what condition?

   AEnergized and carrying its normal operating current BOpen and completely de-energized CDisconnected from the battery at both ends DFused-protected but with the load switch turned off
   Show answer

   Answer: A. Energized and carrying its normal operating current

   Voltage drop from unwanted resistance (corrosion, loose terminals, undersized cable) only appears when current is flowing; an open or de-energized circuit reads little or no drop even with a bad connection. The test is performed with the load operating.

   • B: Open circuit carries no current, so no voltage drop appears despite faults.
   • C: Disconnected at both ends means zero current flow; drop cannot be measured.
   • D: Load switch off means no current flowing, so no measurable drop.
4. EVT E3 Ambulance HVAC

   In an ambulance A/C system, which component absorbs heat from the patient-compartment air and causes the refrigerant to change from a liquid into a low-pressure vapor?

   ACondenser BEvaporator CReceiver-drier DCompressor
   Show answer

   Answer: B. Evaporator

   The evaporator is the low-side heat exchanger where liquid refrigerant boils off, absorbing heat from the compartment air blown across it. The condenser does the opposite job (rejecting heat) on the high side, and the compressor and drier do not exchange heat with cabin air.

   • A: Condenser rejects heat on the high side, it does not absorb cabin heat.
   • C: Receiver-drier stores liquid and removes moisture, no air heat exchange.
   • D: Compressor pressurizes and circulates vapor, it does not absorb cabin heat.
5. EVT E4 Cab, Chassis & Powertrain

   The primary purpose of a fast-idle (high-idle) system on an ambulance chassis is to:

   AReduce tailpipe emissions during long idle periods by cutting idle exhaust output BIncrease alternator output to meet electrical demand and prevent battery discharge CSpeed engine warm-up on cold starts so the heater produces heat sooner DReduce diesel particulate filter (DPF) regeneration frequency during standby
   Show answer

   Answer: B. Increase alternator output to meet electrical demand and prevent battery discharge

   Ambulances draw heavy electrical loads (emergency lighting, HVAC blowers, medical equipment) while parked; raising idle RPM lifts alternator output above the load so the batteries stay charged. Reduced emissions and faster warm-up are incidental, not the design intent.

   • A: Raising idle speed burns more fuel and moves more exhaust, not less.
   • C: Faster warm-up is a side benefit, not the primary purpose.
   • D: Reducing regen frequency is incidental; charging demand drives fast-idle.
6. EVT E0 Maintenance, Inspection & Testing

   Two technicians are discussing an ambulance's 12-volt electrical system. Technician A says the charging system must be capable of carrying the minimum continuous electrical load with the engine at idle or fast idle. Technician B says a load-management (load-shedding) system may automatically disconnect non-critical loads to protect the batteries. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: C. Both Technicians A and B

   NFPA ambulance standards require the alternator/charging system to support the minimum continuous electrical load at idle, and allow an automatic load manager to shed low-priority circuits, which NFPA 1917 (now NFPA 1900) 7.5.1 requires whenever the total continuous load exceeds the alternator's minimum continuous output. Both statements are correct.

   • A: Technician B is also right; load managers may shed non-critical loads
   • B: Technician A is also right; charging must carry load at idle
   • D: Both statements are correct per NFPA ambulance standards
7. EVT E1 Ambulance Design & Performance

   Technician A says a Type I or Type III modular body can typically be unbolted and remounted onto a new chassis when the original chassis is worn out. Technician B says a Type II van-body ambulance is normally remounted the same way to extend its service life. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: A. Technician A only

   Modular Type I/III bodies are engineered to be removed and remounted on a fresh chassis, a major life-cycle cost advantage. A Type II is an integral van conversion generally retired with its chassis, so Technician B is wrong.

   • B: Type II van body is integral and retired with its chassis
   • C: Technician B is wrong; Type II can't be remounted
   • D: Technician A is correct; modular bodies do remount
8. EVT E2 Ambulance Electrical Systems

   Two technicians are discussing an ambulance high-idle (fast-idle) system. Technician A says the system automatically raises engine RPM when the ambulance is parked so the alternator can maintain output for the electrical load. Technician B says the system is typically interlocked to engage only when the transmission is in park or neutral and the parking brake is set. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: C. Both Technicians A and B

   High idle boosts alternator output during prolonged stationary operation when large loads would outpace charging at curb idle, and safety interlocks (park/neutral plus parking brake) prevent it from raising RPM while the vehicle could move. Both statements are correct.

   • A: Ignores B's correct park/neutral and parking-brake interlock statement.
   • B: Ignores A's correct description of high idle boosting alternator output.
   • D: Both statements are actually correct, so neither is wrong.
9. EVT E3 Ambulance HVAC

   Two technicians discuss refrigerant handling on an ambulance. Technician A says that under EPA Section 609 a technician must be certified to service motor-vehicle air conditioning systems. Technician B says that because R-1234yf has a very low global warming potential, it is acceptable to vent it to the atmosphere instead of recovering it. Who is correct?

   ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
   Show answer

   Answer: A. Technician A only

   EPA Section 609 certification is required to service mobile A/C refrigerant, so Technician A is right. Venting refrigerant is prohibited under the Clean Air Act regardless of GWP; it must always be recovered, so Technician B is wrong.

   • B: Tech A is correct; venting any refrigerant is prohibited, so B is wrong.
   • C: Tech B wrong; venting refrigerant regardless of GWP violates the Clean Air Act.
   • D: Tech A is correct; Section 609 certification is required to service MVAC.
10. EVT E4 Cab, Chassis & Powertrain

    Technician A says the added A/C and electrical loads an ambulance carries during prolonged idle increase engine heat rejection, so many chassis receive heavy-duty cooling packages. Technician B says ambulance chassis are commonly validated with a high-ambient idle cooling test to confirm they will not overheat while parked with the A/C running. Who is correct?

    ATechnician A only BTechnician B only CBoth Technicians A and B DNeither Technician
    Show answer

    Answer: C. Both Technicians A and B

    Both are correct. Idling ambulances generate significant heat with little ram airflow, so heavy-duty cooling (larger radiator, HD fan clutch, auxiliary transmission cooler) plus idle/high-ambient cooling-performance testing are standard for ambulance-rated chassis.

    • A: B is also correct; high-ambient idle cooling validation is standard.
    • B: A is also correct; heavy-duty cooling packages are common.
    • D: Both statements are accurate, so 'neither' is false.