Ch 15 Four Wheel and All Wheel Drive
Technician A says that the 4WD mode of many utility vehicles must be engaged when the vehicle is stopped. Technician B says that newer electronically operated 4WD systems can be activated "on the fly." Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
An AWD transfer case can also include a ________. Low-range gear set Shifter for the front output shaft Differential All of these
Differential
When a vehicle turns a corner, what is true about the four wheel travel? Each wheel travels a different distance. The two right side wheels turn the same distance. The two left side wheels turn the same distance. Both B and C are correct.
Each wheel travels a different distance.
At its outer ends, a 4WD front drive axle uses ________. Cardan U-joints CV joints Either A or B Neither A nor B
Either A or B
In 4X4, the first 4 refers to ________. Four wheels on the vehicle Four speed transmission Four-wheel drive Four speed transfer case
Four wheels on the vehicle
Which is NOT true about AWD vehicles? These vehicles provide excellent traction on wet or icy roads It is also called full-time 4WD They often contain a center differential It is also called part-time 4WD
It is also called part-time 4WD
To engage the four-wheel-drive system into four-wheel-drive high range on manual shift on-the-fly (MSOF) transfer case, the vehicle must be moving at about what speed? Less than 10 MPH (16 km/h) Completely stopped At any speed Low speed, usually under 50 MPH (80 km/h)
Low speed, usually under 50 MPH (80 km/h)
What type of four-wheel-drive system does NOT include a center (interaxle) differential? Part-time four-wheel drive All-wheel drive (AWD) Full-time four-wheel drive None of the above
Part-time four-wheel drive
A transfer case used with a transaxle is called a ________. Torque biasing device Coupler device Torque split unit Power transfer unit
Power transfer unit
What type of chain is commonly used in a transfer case? Double roller chain Roller chain Rocker pin Any of the above, depending on application
Rocker pin
Low range in many transfer cases ________. Sends power flow through a reduction gear set Is available only while in 2 wheel drive mode Both A and B Neither A nor B
Sends power flow through a reduction gear set
Technician A says that a center differential is used on AWD vehicles to prevent drive train binding. says that as a vehicle turns a corner, the inside wheels go faster than the outside wheels. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician A only
Two technicians are discussing electronic vacuum operated front hub systems. Technician A says that vacuum is used to engage the hub with the drive axle. Technician B says that vacuum is used to release the hub from the drive axle. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician A only
Technician A says that AWD transfer cases that deliver power to both driveshafts all the time are called electronically active. Technician B says that AWD transfer cases that deliver power to both driveshafts all the time are called mechanically active. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician B only
Technician A says that all 4WD utility vehicles use a solid front drive axle. Technician B says that some 4WD utility vehicles use a solid front drive axle with Cardan U-joints at the axle ends. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician B only
Low range in a transfer case is about what ratio? Correct! 2:1 to about 3:1 12:1 or higher 10:1 8:1
2:1 to about 3:1
How many ways can power flow through a gear driven transfer case? 2 3 1 4
3
What can occur if a part-time four-wheel-drive vehicle is driven on hard pavement in four-wheel drive? Driveline vibrations and damage to drive shafts, U-joints, and bearings Shake and shutter as engine torque is applied to the drive wheels Slip and hop over the pavement All of the above can occur.
All of the above can occur.
Which of the following is true about electronic transfer cases? Some utilize electronic sensors to detect wheel slippage. Some use a hydraulically applied internal clutch. They can automatically lock or drive both or either output shaft as needed to suit driving conditions. All of these are correct.
All of these are correct.
Most transfer cases are lubricated using ________. An external pump An internal oil pump Splash lubrication Any of the above, depending on the application
An internal oil pump
What type of unit is used as a center differential inside a transfer case? Viscous coupling Planetary gear set Bevel gear differential Any of the above
Any of the above
A four-wheel drive transfer case is used to ________. Control power flow to the second driveshaft Provide gear reduction for additional torque Both A and B Neither A nor B
Both A and B
Technician A says that AWD vehicles must use four equal diameter tires. Technician B says that unequal tire diameters on an AWD vehicle will cause the center differential to operate constantly. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
Technician A says that engine vacuum is used to connect the front wheel hubs on many electronically controlled 4WD systems. Technician B says that the integrated wheel end disconnect system automatically connects or disconnects the outboard CV joint with the wheel hub on many newer 4WD vehicles. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
Technician A says that some front 4WD hubs must be manually locked and unlocked. Technician B says that some front 4WD hubs can be automatically locked and unlocked. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
