Chapter 35 Four wheel drive/All wheel drive
Tech A says that mechanical shifting controls can wear out over time. Tech B says that vacuum control rubber diaphragms can deteriorate over time. Who is correct? A. Tech A B. Tech B C. Both Tech A and Tech B D. neither
C. Both Tech A and Tech B
In a 4 wheel drive vehicle, final drives are found : A. in the front of the vehicle B. in the rear of the vehicle C. Both in the front and the rear of the vehicle D. in neither
C. Both in the front and the rear of the vehicle
In a part-time four-wheel drive vehicle, when two-wheel drive is selected, power is transferred to: A. All four wheels B. Only the front wheels C. Only the rear wheels D. None of the above
C. Only the rear wheels
Each four-wheel drive type of driveshaft has a U-joint at each end to transmit the drive through varying angles. Select one: True False
True
If the voltage reading across a circuit is not correct, then the voltage drop on each side of the affected circuit must be measured to determine which side has the voltage drop. Select one: True False
True
The differential gears allow the rear wheels to rotate at different speeds when the vehicle is turning, while continuing to transmit an equal turning effort to each wheel. Select one: True False
True
______ transmits power to the front and rear drive axles at normal drive speed. Select one: a. Four-wheel drive low range b. Two-wheel drive c. Four-wheel drive high range d. Neutral
a. Four-wheel drive low range
Wheel bearings and hubs are subject to wheel rim offsets that throw off the wheel's scrub _____ and cause premature failure of the bearings and hubs. Select one: a. Radius b. Circumference c. Diameter d. Hypotenuse
a. Radius
Tech A says that part-time four-wheel drive does not use a transfer case. Tech B says that constant-velocity joints are used on some four-wheel drive vehicles. Who is correct? Select one: a. Tech A b. Tech B c. Both A and B d. Neither A nor B
b. Tech B
Tech A says that part-time four-wheel drive does not use a transfer case. Tech B says that constant-velocity joints are used on some four-wheel drive vehicles. Who is correct? Select one: a. Tech A b. Tech B c. Both A and B d. Neither A nor B
b. Tech B
Technician A says that in all-wheel-drive vehicles, locked differentials are used to ensure ease in driving around curves. Technician B says that a third set of differential gears is used to allow turning and driving into curves. Who is correct? Select one: a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B
b. Technician B
Using ______ drive prevents excessive tire wear and possible damage to the drivelines or other drivetrain components. Select one: a. Four-wheel b. Two-wheel c. All-wheel d. Rear-wheel
b. Two-wheel
All-wheel drive transfer cases on front-wheel-drive vehicles are bolted to the: Select one: a. output of the engine. b. output of the transaxle. c. back of the engine. d. driveshaft.
b. output of the transaxle.
While in four-wheel drive, binding of the drive train is caused by: Select one: a. loose binding straps on the transfer case. b. the fact that the front wheels travel farther than the rear wheels. c. the fact that the rear wheels travel farther than the front wheels. d. incorrect drive shaft spacing.
b. the fact that the front wheels travel farther than the rear wheels.
While in low range in a vehicle with all-wheel drive, the output speed ratio can be about: Select one: a. (1:1) b. (4.20:1) c. (2.48:1) d. (3.0:1)
c. (2.48:1)
The transfer case is a device designed to split the power from the transmission to the ______ when four-wheel drive is selected. Select one: a. Front-drive axles b. Rear-drive axles c. Both A and B d. Neither A nor B
c. Both A and B
_______ can put stress on the transfer case. Select one: a. Snowplowing b. Off-roading c. Both A and B d. Neither A nor B
c. Both A and B
______ transmits power to the front and rear drive axles at normal drive speed. Select one: a. Four-wheel drive low range b. Two-wheel drive c. Four-wheel drive high range d. Neutral
c. Four-wheel drive high range
In a part-time four-wheel drive vehicle, when two-wheel drive is selected, power is transferred to: Select one: a. all four wheels. b. only the front wheels. c. only the rear wheels. d. none of the wheels.
c. only the rear wheels.
Signal circuits should have less than a ___-volt drop. Select one: a. 0.4 b. 0.3 c. 0.2 d. 0.1
d. 0.1
Generally, each side of a control circuit should have less than a ___-volt drop. Select one: a. 0.2 b. 0.3 c. 0.4 d. 0.5
d. 0.5
A viscous coupler uses ____ sets of clutch plates that are alternated front to back. Select one: a. Five b. Four c. Three d. Two
d. Two
When the transfer case of an all-wheel-drive vehicle is in high range the wheels: Select one: a. are allowed to rotate at different speeds. b. rotate at the same speed. c. gain more traction on loose road surfaces. d. are locked and cannot turn.
d. are locked and cannot turn.
When the fluid in a viscous coupling becomes heated, the fluid will: Select one: a. thin out to lubricate better. b. overheat and have to be changed. c. not be affected by heat. d. thicken to help coupling.
d. thicken to help coupling.
A mechanical differential lock may use a(an)_______ to engage and disengage the locking mechanism A. Electric or vacuum motor B. Coil spring C. Vicious coupling D. Sliding pin
B. Coil spring
A transfer case is most often used in a(an): A. Front wheel drive (FWD) vehicle B. Four wheel drive (AWD) C. Rear wheel drive (RWD)
B. Four wheel drive (AWD)
In _______ drive, power comes into the transfer case by the input shaft, through the idler gear to the output shaft, and to the rear driveshaft. Select one: a. Four-wheel b. Two-wheel c. All-wheel d. Rear-wheel
b. Two-wheel
Technician A says that mechanical shifting controls can wear out over time. Technician B says that vacuum control rubber diaphragms can deteriorate over time. Who is correct? Select one: a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor B
c. Both Technician A and Technician B
Which of these manages line pressures, shift functions, and driver preferences in an electronically controlled transmission? Select one: a. Electronic brake control module (EBCM) b. Engine control module (ECM) c. Transmission control module (TCM) d. Body control module (BCM)
c. Transmission control module (TCM)
When reassembling a locking hub mechanism, it is a good idea to replace the: Select one: a. retaining plate. b. all snap rings. c. bearing seal. d. axle shafts.
c. bearing seal.
In a 4-wheel drive vehicle, final drives are found: Select one: a. in the front of the vehicle. b. in the rear of the vehicle. c. both in the front and rear of the vehicle. d. in neither the front or rear of the vehicle.
c. both in the front and rear of the vehicle.
All of the following are used for shift controls for engaging transfer cases EXCEPT: Select one: a. mechanical. b. vacuum. c. hydraulic d. electrically motorized.
c. hydraulic
Before the transfer case has been removed, inspect the outer casing for any cracks, oil leaks, or other signs of damage, as this will dictate the proper overhaul procedure. Select one: True False
False
In all-wheel drive vehicles, only two of the wheels are normally powered, typically the rear wheels. Select one: True False
False
Transfer cases and PTOs perform the same task, splitting power between the front and rear axles. Select one: True False
True
Using the traction control system to apply the brake unit at the wheel that is slipping increases the amount of torque to the other wheels that have more traction. Select one: True False
True
ulse-width modulated shift patterns are used to save transmission component wear. Select one: True False
True
Which of the following is NOT a possible power transfer option for a driver to select in a vehicle equipped with a transfer case? A. Four-Wheel drive high range B. Rear-Wheel drive mid range C. Two-wheel drive D. Neutral
B. Rear-Wheel drive mid range
If a newer all wheel drive vehicle slips on a slippery surface_____is/are used to control the slippery wheels. A. ring and pinion gears B. Traction control C. Manually locking hubs D. Drive pinions
B. Traction control
When testing a four wheel drive electronic component, the tech will use a scan tool to pull codes and then a ____ to diagnose any codes found: A. Test light B. Noid light C. Oil pressure gauge D. DVOM
D. DVOM
Two wheel drive should be chosen for firm road surfaces for all of these reasons except A. To prevent excessive tire wear B. To prevent damage to the drive train C. To increase fuel economy D. To provide increased traction on slippery surfaces
D. To provide increased traction on slippery surfaces
Two-wheel drive should be chosen for firm road surfaces for all of these reasons except Select one: a. to prevent excessive tire wear. b. to prevent damage to the drive train. c. to increase fuel economy. d. to provide increased traction on slippery surfaces.
d. to provide increased traction on slippery surfaces.