• EVT F6 — Allison Automatic
Transmissions Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf.
1. In an emergency vehicle equipped with an Allison automatic
transmission, what is the primary function of the torque converter
during initial vehicle movement from a standstill?
A. To mechanically lock the engine crankshaft directly to the transmission
input shaft at all times
B. To provide hydraulic coupling between the engine and transmission
while allowing torque multiplication during acceleration
C. To regulate electrical voltage supplied to the transmission control
module
D. To prevent the transmission from selecting first gear under heavy loads
B. To provide hydraulic coupling between the engine and transmission
while allowing torque multiplication during acceleration
,The torque converter transfers engine power hydraulically and can
multiply torque during initial acceleration, which is particularly valuable
for heavy emergency vehicles starting under substantial load.
2. Which Allison automatic transmission component is primarily
responsible for changing the effective gear ratio by engaging
different combinations of clutches and rotating members?
A. Hydraulic retarder
B. Torque converter housing
C. Planetary gear train
D. Output flange
C. Planetary gear train
Planetary gear sets provide the various forward and reverse ratios by
controlling different members of the gear train through selectively
applied clutches and brakes.
3. During routine inspection of an Allison automatic transmission in a
fire apparatus, which condition should be treated as a significant
indication of a possible transmission problem?
A. Transmission fluid within the specified operating range and normal
color
B. A clean electrical connector with secure terminals
C. Repeated fluid leakage around the transmission housing
D. Normal engagement of all selected ranges
,C. Repeated fluid leakage around the transmission housing
Persistent leakage can reduce fluid level and pressure, potentially
causing lubrication, cooling, hydraulic-control, and clutch-application
problems that can lead to major transmission damage.
4. Why is maintaining the correct transmission fluid level particularly
important in an Allison automatic transmission?
A. The fluid is used only to lubricate the parking brake cable
B. The fluid performs hydraulic, lubricating, cooling, and friction-
management functions
C. The fluid determines the vehicle's tire pressure
D. The fluid provides fuel pressure to the engine
B. The fluid performs hydraulic, lubricating, cooling, and friction-
management functions
Automatic transmission fluid has multiple critical functions, including
transmitting hydraulic pressure, lubricating components, removing
heat, and providing the required friction characteristics for clutch
operation.
5. A technician discovers that an Allison transmission repeatedly
operates at an unusually high temperature during emergency
vehicle operation. Which investigation should receive priority?
A. Checking the windshield washer reservoir
B. Inspecting the transmission cooling system and fluid condition
, C. Replacing the vehicle's headlights
D. Adjusting the steering wheel position
B. Inspecting the transmission cooling system and fluid condition
Excessive transmission temperature can result from inadequate cooling,
incorrect or degraded fluid, excessive load, restricted airflow, or other
mechanical or control problems and should be investigated promptly.
6. What is the principal purpose of the transmission oil cooler in a
heavy emergency vehicle?
A. To increase engine coolant temperature
B. To maintain transmission fluid within an acceptable operating-
temperature range
C. To increase transmission fluid viscosity indefinitely
D. To eliminate the need for transmission fluid changes
B. To maintain transmission fluid within an acceptable operating-
temperature range
The cooler removes heat generated by the transmission and helps
maintain fluid properties and component temperatures within
acceptable limits.
7. In an electronically controlled Allison transmission, what is the
principal role of the transmission control module?
Transmissions Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf.
1. In an emergency vehicle equipped with an Allison automatic
transmission, what is the primary function of the torque converter
during initial vehicle movement from a standstill?
A. To mechanically lock the engine crankshaft directly to the transmission
input shaft at all times
B. To provide hydraulic coupling between the engine and transmission
while allowing torque multiplication during acceleration
C. To regulate electrical voltage supplied to the transmission control
module
D. To prevent the transmission from selecting first gear under heavy loads
B. To provide hydraulic coupling between the engine and transmission
while allowing torque multiplication during acceleration
,The torque converter transfers engine power hydraulically and can
multiply torque during initial acceleration, which is particularly valuable
for heavy emergency vehicles starting under substantial load.
2. Which Allison automatic transmission component is primarily
responsible for changing the effective gear ratio by engaging
different combinations of clutches and rotating members?
A. Hydraulic retarder
B. Torque converter housing
C. Planetary gear train
D. Output flange
C. Planetary gear train
Planetary gear sets provide the various forward and reverse ratios by
controlling different members of the gear train through selectively
applied clutches and brakes.
3. During routine inspection of an Allison automatic transmission in a
fire apparatus, which condition should be treated as a significant
indication of a possible transmission problem?
A. Transmission fluid within the specified operating range and normal
color
B. A clean electrical connector with secure terminals
C. Repeated fluid leakage around the transmission housing
D. Normal engagement of all selected ranges
,C. Repeated fluid leakage around the transmission housing
Persistent leakage can reduce fluid level and pressure, potentially
causing lubrication, cooling, hydraulic-control, and clutch-application
problems that can lead to major transmission damage.
4. Why is maintaining the correct transmission fluid level particularly
important in an Allison automatic transmission?
A. The fluid is used only to lubricate the parking brake cable
B. The fluid performs hydraulic, lubricating, cooling, and friction-
management functions
C. The fluid determines the vehicle's tire pressure
D. The fluid provides fuel pressure to the engine
B. The fluid performs hydraulic, lubricating, cooling, and friction-
management functions
Automatic transmission fluid has multiple critical functions, including
transmitting hydraulic pressure, lubricating components, removing
heat, and providing the required friction characteristics for clutch
operation.
5. A technician discovers that an Allison transmission repeatedly
operates at an unusually high temperature during emergency
vehicle operation. Which investigation should receive priority?
A. Checking the windshield washer reservoir
B. Inspecting the transmission cooling system and fluid condition
, C. Replacing the vehicle's headlights
D. Adjusting the steering wheel position
B. Inspecting the transmission cooling system and fluid condition
Excessive transmission temperature can result from inadequate cooling,
incorrect or degraded fluid, excessive load, restricted airflow, or other
mechanical or control problems and should be investigated promptly.
6. What is the principal purpose of the transmission oil cooler in a
heavy emergency vehicle?
A. To increase engine coolant temperature
B. To maintain transmission fluid within an acceptable operating-
temperature range
C. To increase transmission fluid viscosity indefinitely
D. To eliminate the need for transmission fluid changes
B. To maintain transmission fluid within an acceptable operating-
temperature range
The cooler removes heat generated by the transmission and helps
maintain fluid properties and component temperatures within
acceptable limits.
7. In an electronically controlled Allison transmission, what is the
principal role of the transmission control module?
