VFIS FINALS 2027 ANSWERS AND QUESTIONS SET
A+
✔✔The suspension system includes what four things? - ✔✔1. Axles
2. Springs
3. Wheels
4. Tires
✔✔What is the overall rating of the suspension system based on? - ✔✔The weakest
link in any component in that system, including the wheels and tires
✔✔Each tire has about __x___ inches or __-__ square inches of contact with the road. -
✔✔8.5 x 11 inches
40 - 93 square inches
✔✔Many authorities recommend a minimum tread depth of __" for tires on emergency
vehicles. - ✔✔4/32"
✔✔What are the three types of braking systems? - ✔✔1. Standard or service
2. Parking
3. Auxiliary
✔✔What are the two types of standard or service brakes currently in use? - ✔✔1. Drum
brakes
2. Disc brakes
✔✔Electronic brake systems are referred to as "____" or "___" since they work in
conjunction with the ABS. - ✔✔1. "brake by wire"
2. "stability control"
✔✔What does an Automatic Traction Control (ATC) do? - ✔✔It uses the signal from the
wheel sensors to determine if the drive wheels are spinning because excessive power is
being furnished
,✔✔NFPA 1901 requires an auxiliary braking system on all vehicles with a GVWR of ___
pounds or more. The standard also recommends their use on apparatus down to ___
pounds GVWR. - ✔✔36,000 pounds
31,000 pounds
✔✔What type of ambulance should consider auxiliary braking? - ✔✔Type IV
✔✔What are four types of auxiliary braking systems? - ✔✔1. Driveline retarders
2. Compression or engine brakes
3. Exhaust brakes
4. Transmission retarders
✔✔How do driveline retarders work? - ✔✔By slowing the rotation of the driveshaft. They
are generally electromagnetic devices
✔✔How do engine brakes or compression brakes work? - ✔✔By altering valve timing
under deceleration by opening the exhaust valves at top dead center of the stroke for an
instant, releasing cylinder compression and eliminating the expansion stroke.
✔✔What are engine brakes or compression brakes commonly referred to as? -
✔✔"Jake Brakes"
✔✔Exhaust brakes consist of what type of valve that closes, restricting the flow of
exhaust gasses and creating back pressure on the engine, slowing the engine's
revolutions per minute? - ✔✔butterfly valve
✔✔Some brands of exhaust brakes are not effective at speeds less than what mph? -
✔✔20mph
✔✔Transmission retarders may be of two types : - ✔✔1. The input type that operates at
the input section of the transmission (between the torque converter housing and the
main housing)
2. The output retarder that operates at the tail shaft of the transmission
✔✔What type fo transmission retarder is the most prevalent on emergency vehicles? -
✔✔Output retarder
✔✔How do output retarders work? - ✔✔By using transmission fluid to power an
opposing direction wheel on the drive shaft within the transmission
✔✔Auxiliary braking systems can increase the braking lining life by as much as __ to __
times the normal service period. - ✔✔three to five times
, ✔✔What is the emergency vehicle design consideration that affects vehicle handling
and influences the physical forces? - ✔✔The design and use of the baffling system,s on
vehicles that carry water
✔✔What is the emergency vehicle design consideration that affects vehicle handling
and influences the physical forces? - ✔✔The design and use of the baffling system,s on
vehicles that carry water
✔✔For each inch in added height, what also moves up? - ✔✔center of gravity
✔✔What is the emergency vehicle design consideration that affects vehicle handling
and influences the physical forces? - ✔✔
✔✔What are contributing factors that can cause additional problems on the road? -
✔✔Increased weight and poor weight distribution
✔✔Rollovers are likely as the what happens? - ✔✔The weight shifts and the center of
gravity changes
✔✔What three emergency vehicles are particularly vulnerable to rollover because of
their high center of gravity? - ✔✔1. Tanker/Tenders
2. Tillers
3. Ambulances
✔✔Fire engines and tankers/tenders may weigh as much how many pounds or more? -
✔✔50,000 lbs
✔✔For each inch in added height, what also moves up? - ✔✔
✔✔Transmission retarders may be of two types : - ✔✔
✔✔What is one of the forces that shapes our actions or behaviors? - ✔✔Motivation
✔✔Exhaust brakes consist of what type of valve that closes, restricting the flow of
exhaust gasses and creating back pressure on the engine? - ✔✔
✔✔What is the first step to understanding motivation? - ✔✔Recognition of the condition
and situations that cause use to act in certain ways
✔✔Recognition of the condition and situations that cause us to act in certain ways. -
✔✔Psychological set
✔✔What are examples of dynamic forces? - ✔✔1. Adverse weather
A+
✔✔The suspension system includes what four things? - ✔✔1. Axles
2. Springs
3. Wheels
4. Tires
✔✔What is the overall rating of the suspension system based on? - ✔✔The weakest
link in any component in that system, including the wheels and tires
✔✔Each tire has about __x___ inches or __-__ square inches of contact with the road. -
✔✔8.5 x 11 inches
40 - 93 square inches
✔✔Many authorities recommend a minimum tread depth of __" for tires on emergency
vehicles. - ✔✔4/32"
✔✔What are the three types of braking systems? - ✔✔1. Standard or service
2. Parking
3. Auxiliary
✔✔What are the two types of standard or service brakes currently in use? - ✔✔1. Drum
brakes
2. Disc brakes
✔✔Electronic brake systems are referred to as "____" or "___" since they work in
conjunction with the ABS. - ✔✔1. "brake by wire"
2. "stability control"
✔✔What does an Automatic Traction Control (ATC) do? - ✔✔It uses the signal from the
wheel sensors to determine if the drive wheels are spinning because excessive power is
being furnished
,✔✔NFPA 1901 requires an auxiliary braking system on all vehicles with a GVWR of ___
pounds or more. The standard also recommends their use on apparatus down to ___
pounds GVWR. - ✔✔36,000 pounds
31,000 pounds
✔✔What type of ambulance should consider auxiliary braking? - ✔✔Type IV
✔✔What are four types of auxiliary braking systems? - ✔✔1. Driveline retarders
2. Compression or engine brakes
3. Exhaust brakes
4. Transmission retarders
✔✔How do driveline retarders work? - ✔✔By slowing the rotation of the driveshaft. They
are generally electromagnetic devices
✔✔How do engine brakes or compression brakes work? - ✔✔By altering valve timing
under deceleration by opening the exhaust valves at top dead center of the stroke for an
instant, releasing cylinder compression and eliminating the expansion stroke.
✔✔What are engine brakes or compression brakes commonly referred to as? -
✔✔"Jake Brakes"
✔✔Exhaust brakes consist of what type of valve that closes, restricting the flow of
exhaust gasses and creating back pressure on the engine, slowing the engine's
revolutions per minute? - ✔✔butterfly valve
✔✔Some brands of exhaust brakes are not effective at speeds less than what mph? -
✔✔20mph
✔✔Transmission retarders may be of two types : - ✔✔1. The input type that operates at
the input section of the transmission (between the torque converter housing and the
main housing)
2. The output retarder that operates at the tail shaft of the transmission
✔✔What type fo transmission retarder is the most prevalent on emergency vehicles? -
✔✔Output retarder
✔✔How do output retarders work? - ✔✔By using transmission fluid to power an
opposing direction wheel on the drive shaft within the transmission
✔✔Auxiliary braking systems can increase the braking lining life by as much as __ to __
times the normal service period. - ✔✔three to five times
, ✔✔What is the emergency vehicle design consideration that affects vehicle handling
and influences the physical forces? - ✔✔The design and use of the baffling system,s on
vehicles that carry water
✔✔What is the emergency vehicle design consideration that affects vehicle handling
and influences the physical forces? - ✔✔The design and use of the baffling system,s on
vehicles that carry water
✔✔For each inch in added height, what also moves up? - ✔✔center of gravity
✔✔What is the emergency vehicle design consideration that affects vehicle handling
and influences the physical forces? - ✔✔
✔✔What are contributing factors that can cause additional problems on the road? -
✔✔Increased weight and poor weight distribution
✔✔Rollovers are likely as the what happens? - ✔✔The weight shifts and the center of
gravity changes
✔✔What three emergency vehicles are particularly vulnerable to rollover because of
their high center of gravity? - ✔✔1. Tanker/Tenders
2. Tillers
3. Ambulances
✔✔Fire engines and tankers/tenders may weigh as much how many pounds or more? -
✔✔50,000 lbs
✔✔For each inch in added height, what also moves up? - ✔✔
✔✔Transmission retarders may be of two types : - ✔✔
✔✔What is one of the forces that shapes our actions or behaviors? - ✔✔Motivation
✔✔Exhaust brakes consist of what type of valve that closes, restricting the flow of
exhaust gasses and creating back pressure on the engine? - ✔✔
✔✔What is the first step to understanding motivation? - ✔✔Recognition of the condition
and situations that cause use to act in certain ways
✔✔Recognition of the condition and situations that cause us to act in certain ways. -
✔✔Psychological set
✔✔What are examples of dynamic forces? - ✔✔1. Adverse weather
