Question 1

Torque converter

Accepted Answer

A fluid coupling that transmits power from the engine to the transmission.

Question 2

Transmission retarder

Accepted Answer

A device that helps slow down the vehicle by using engine compression to create resistance.

Question 3

Clutch

Accepted Answer

A device that engages and disengages power transmission between the engine and the transmission.

Question 4

Synchronizer

Accepted Answer

A mechanism that matches the rotational speeds of gears for smooth shifting.

Question 5

Planetary gear set

Accepted Answer

A gear system that consists of sun gears, planet gears, and a ring gear, enabling different gear ratios.

Question 6

Shift fork

Accepted Answer

A device used to engage and disengage gears in a manual transmission.

Question 7

Shift rail

Accepted Answer

A component that controls the movement of shift forks in a manual transmission.

Question 8

Shift solenoid

Accepted Answer

An electrical device that controls the engagement of gears in an automatic transmission.

Question 9

Shift valve

Accepted Answer

A hydraulic valve that directs fluid flow to engage different gears in an automatic transmission.

Question 10

PTO (Power Take-Off)

Accepted Answer

A device that transfers engine power to auxiliary equipment, such as hydraulic pumps.

Question 11

Differential

Accepted Answer

A device that allows the wheels to rotate at different speeds while receiving power from the driveshaft.

Question 12

Ring and pinion

Accepted Answer

A gear set that transfers power from the driveshaft to the differential.

Question 13

Driveshaft

Accepted Answer

A rotating shaft that transfers power from the transmission to the differential.

Question 14

Universal joint

Accepted Answer

A flexible joint used in the driveshaft to accommodate the movement of the suspension.

Question 15

Axle shaft

Accepted Answer

A shaft that connects the differential to the wheels, transmitting power to the wheels.

Question 16

Constant velocity joint (CV joint)

Accepted Answer

A joint that allows the axle shaft to transmit power while accommodating the wheel's movement.

Question 17

Final drive ratio

Accepted Answer

The gear ratio between the ring and pinion gears in the differential.

Question 18

Gear ratio

Accepted Answer

The ratio between the number of teeth on two meshing gears, determining the speed and torque.

Question 19

Overdrive

Accepted Answer

A gear ratio that allows the output shaft of the transmission to rotate faster than the engine speed.

Question 20

Underdrive

Accepted Answer

A gear ratio that allows the output shaft of the transmission to rotate slower than the engine speed.

Question 21

Synchromesh

Accepted Answer

A type of manual transmission that uses synchronizers to match gear speeds during shifting.

Question 22

Fluid coupling

Accepted Answer

A type of torque converter that uses hydraulic fluid to transmit power.

Question 23

Governor

Accepted Answer

A device that controls the transmission shift points based on vehicle speed.

Question 24

Kickdown

Accepted Answer

A feature in automatic transmissions that allows downshifting for increased acceleration.

Question 25

Neutral safety switch

Accepted Answer

A safety device that prevents the vehicle from starting in gear.

Question 26

Input shaft

Accepted Answer

The shaft that receives power from the engine and transfers it to the transmission.

Question 27

Output shaft

Accepted Answer

The shaft that transfers power from the transmission to the driveshaft.

Question 28

Transmission control module (TCM)

Accepted Answer

An electronic control unit that manages the operation of an automatic transmission.

Question 29

Clutch disc

Accepted Answer

The component that engages with the flywheel to transmit power in a manual transmission.

Question 30

Throwout bearing

Accepted Answer

A bearing that applies pressure to the clutch disc to disengage the engine from the transmission.

Question 31

Flexplate

Accepted Answer

A component that connects the engine to the torque converter in an automatic transmission.

Question 32

Friction material

Accepted Answer

The material used on clutches and brake bands to create friction and transfer power.

Question 33

Reverse idler gear

Accepted Answer

A gear used to change the direction of rotation in the transmission for reverse gear.

Question 34

Transmission cooler

Accepted Answer

A device that cools the transmission fluid to prevent overheating.

Question 35

Shift indicator

Accepted Answer

A display or indicator that shows the selected gear or gear range.

Question 36

Upshift

Accepted Answer

The process of shifting to a higher gear for increased speed.

Question 37

Downshift

Accepted Answer

The process of shifting to a lower gear for increased torque or deceleration.

Question 38

Shift linkage

Accepted Answer

The mechanical connection between the gear shifter and the transmission.

Question 39

Transmission filter

Accepted Answer

A filter that removes contaminants from the transmission fluid.

Question 40

Transmission fluid pump

Accepted Answer

A device that circulates transmission fluid through the transmission.

Question 41

Gear lever

Accepted Answer

The control lever used to select different gears in a manual transmission.

Question 42

Transmission mount

Accepted Answer

A support component that holds the transmission in place.

Question 43

Gear engagement

Accepted Answer

The process of gears meshing together to transmit power.

Question 44

Drive belt

Accepted Answer

A belt that transfers power from the engine to auxiliary components, such as the alternator or air conditioner.

Question 45

Input sensor

Accepted Answer

A sensor that detects the rotational speed of the input shaft in the transmission.

Question 46

Output sensor

Accepted Answer

A sensor that detects the rotational speed of the output shaft in the transmission.

Question 47

Drive axle

Accepted Answer

An axle that transmits power from the differential to the wheels.

Question 48

Limited-slip differential

Accepted Answer

A differential that can vary torque distribution between the wheels for improved traction.

Question 49

Axle ratio

Accepted Answer

The ratio of the number of teeth on the ring gear to the number of teeth on the pinion gear in the differential.

Question 50

Transaxle

Accepted Answer

A combination of a transmission and differential in one integrated unit.

Question 51

Gear pump

Accepted Answer

A type of hydraulic pump used in some transmissions to circulate fluid.

Question 52

Transmission cooler lines

Accepted Answer

The lines that carry transmission fluid to and from the transmission cooler.

Question 53

Centrifugal clutch

Accepted Answer

A type of clutch that uses centrifugal force to engage and disengage power transmission.

Question 54

Double clutching

Accepted Answer

A technique used in manual transmissions that involves disengaging the clutch twice during shifting.

Question 55

Dual-range transmission

Accepted Answer

A transmission that provides two sets of gear ratios for high and low speed ranges.

Question 56

Reverse gear lockout

Accepted Answer

A mechanism that prevents accidentally shifting into reverse while moving forward.

Question 57

Shift interlock

Accepted Answer

A safety feature that prevents shifting out of park without depressing the brake pedal.

Question 58

Gear selector valve

Accepted Answer

A hydraulic valve that directs fluid flow to engage different gears in an automatic transmission.

Question 59

Transmission computer

Accepted Answer

An electronic control unit that manages the operation of an automatic transmission.

Question 60

Input speed sensor

Accepted Answer

A sensor that detects the rotational speed of the input shaft in an automatic transmission.

Question 61

Output speed sensor

Accepted Answer

A sensor that detects the rotational speed of the output shaft in an automatic transmission.

Question 62

Transfer case

Accepted Answer

A device that distributes power between the front and rear axles in a four-wheel drive vehicle.

Question 63

Torsional damper

Accepted Answer

A device that absorbs and dampens engine vibrations in the drivetrain.

Question 64

Flywheel

Accepted Answer

A rotating disk that connects to the engine crankshaft and provides a mounting surface for the clutch.

ASE Transit Bus Certification Flashcards - H3 Drive Train