Question 1

A differential is needed between any two drive wheels, whether in a RWD, FWD, all-wheel drive (AWD), pr four-wheel drive (4WD).

Accepted Answer

A differential is necessary to allow the wheels to rotate at different speeds when turning or when encountering different traction conditions. This applies to any vehicle with multiple drive wheels, including RWD, FWD, AWD, and 4WD.

Question 2

Preload in bearings eliminates _____.
A) torque
B) pressure
C) breakage
D) looseness

Accepted Answer

Preload in bearings eliminates looseness by applying a small amount of force to the bearings, which ensures that they are always in contact with each other and eliminate any clearance or play. This improves the precision and accuracy of the bearing operation. It does not eliminate torque, pressure, or breakage.

Question 3

At least four bearings are found in all differentials: one over the drive pinion shaft with the other three supporting the differential case.

Accepted Answer

Typically, a differential will have two bearings supporting the drive pinion shaft and two bearings supporting the differential case, making a total of four bearings, not the three for the case and one for the pinion as stated.

Question 4

A _____ gearset is one in which any one pinion tooth comes into contact with only some of the ring gear teeth. One revolution of the ring gear is required to achieve all possible gear tooth contact combinations.
A) hunting
B) nonhunting
C) partial nonhunting
D) hypoid

Accepted Answer

The answer of A _____ gearset is one in which...

Question 5

The main types of _____ are torque sensitive, speed sensitive, or mechanically locked.
A) limited-slip differentials
B) locked differentials
C) gear sets
D) clutch packs

Accepted Answer

Limited-slip differentials can either be torque sensitive, speed sensitive or mechanically locked, depending on their design. Locked differentials are always mechanically locked, while gear sets and clutch packs do not have different types.

Question 6

Backlash is the clearance or play between two gears in a mesh.

Accepted Answer

Backlash is indeed the clearance or play between two gears in a mesh.

Question 7

A _____ gearset is one in which any one pinion tooth comes into contact with only some of the ring gear teeth, but more that one revolution of the ring gear is required to achieve all possible gear tooth contact combinations.
A) hunting
B) nonhunting
C) partial nonhunting
D) hypoid

Accepted Answer

This scenario describes a partial nonhunting gearset. Hunting gearsets have all possible gear tooth contact combinations achieved within one revolution of the ring gear, while nonhunting gearsets have no repeated gear tooth contact combinations. Partial nonhunting gearsets fall in between. Hypoid gearsets have offset axes and do not fit this description.

Question 8

When engines are placed longitudinally in the car, they are said to have "north/south" placement.

Accepted Answer

This is true. Longitudinal engine placement means that the engine is mounted with the crankshaft running from front to back of the vehicle, which is also referred to as a "north/south" configuration.

Question 9

The overhung-mounted pinion has three bearings supporting the pinion.

Accepted Answer

An overhung-mounted pinion typically has two bearings supporting it, with the pinion extending beyond the bearings, hence the term "overhung."

Question 10

_____ express the number of turns the drive gear makes compared to one turn of the driven gear it mates with.
A) Rotations
B) Gear ratios
C) Circulations
D) Combinations

Accepted Answer

Gear ratios express the ratio of the number of turns the drive gear makes to one turn of the driven gear it mates with. This is important in determining the speed, torque, and power of a gear system. Rotations, circulations, and combinations are not specific terms used to describe the relationship between gears.

Question 11

The differential case is mounted on _____ so that it is able to rotate independently of the drive axles.
A) shafts
B) gears
C) bearings
D) pinions

Accepted Answer

The differential case is mounted on bearings which allow it to rotate independently of the drive axles. The shafts, gears, and pinions are all components of the differential, but they do not provide the necessary rotational movement.

Question 12

The bearing of a _____ is located on the outside of the housing which places all of the vehicle's weight on the axle housing with no weight on the axle.
A) full-floating rear axle
B) three-quarter floating rear axle
C) semifloating rear axle
D) dead axle

Accepted Answer

A full-floating rear axle places all of the vehicle's weight on the axle housing, while the axle itself is only responsible for transmitting torque from the differential to the wheels. This design allows for better weight distribution and handling, as well as easier servicing of the axle components. The other options (B, C, and D) all have some amount of weight placed on the axle itself.

Question 13

RWD final drives normally use a hypoid ring and pinion gearset that turns the power-flow 45 degrees from the drive shaft to the drive axles.

Accepted Answer

RWD final drives typically use a hypoid gearset that turns the power-flow approximately 90 degrees from the driveshaft to the drive axles, not 45 degrees.

Question 14

In a ring gear and pinion gear set, the pinion is the larger drive gear and the ring gear is the smaller driven gear.

Accepted Answer

The pinion is the smaller drive gear and the ring gear is the larger driven gear.

Question 15

The _____ is the final set of reduction gears the engine's power passes through on its way to the drive wheels.
A) final fear
B) final drive
C) drive shaft
D) driveline

Accepted Answer

The final set of reduction gears is commonly referred to as the final drive. The other options listed are components of the drivetrain but are not specifically related to the final set of gears.

Question 16

Technician A says, upon heavy acceleration, the pinion attempts to climb up the ring gear due to an "equal and opposite" reaction. Technician B says this action attempts to raise the front of the differential housing. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Both technicians are correct. The pinion tries to climb up the ring gear due to an "equal and opposite" reaction, and this action also attempts to raise the front of the differential housing.

Question 17

Technician A says the hypoid gearset was designed to lower the body profile. Technician B says hypoid gears provide for smoother and quieter action. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

The hypoid gearset was indeed designed to lower the body profile of vehicles, allowing for a more streamlined design, which is what Technician A suggests. Additionally, hypoid gears are known for their smoother and quieter operation compared to other types of gears, supporting Technician B's statement. Therefore, both technicians are correct.

Question 18

To replace a ring and pinion gearset with one of the correct ratio, the ratio of the original set must be known.

Accepted Answer

Knowing the ratio of the original ring and pinion gearset is necessary in order to select the correct replacement gearset with the same ratio.

Question 19

Geared, torque-sensitive mechanical limited-slip differentials use _____ gears which react to an increase or decrease in torque at one of two shafts.
A) hypoid
B) limited-slip
C) helical
D) worm

Accepted Answer

The answer of Geared, torque-sensitive mechanical limited-slip differentials use _____...

Question 20

The teeth of a hypoid gear are _____, causing a wiping action when meshing.
A) circular
B) straight in a line
C) curved to follow a spiral
D) elliptical

Accepted Answer

The teeth of a hypoid gear are curved to follow a spiral, allowing them to have a wider contact area with their mating gear compared to a straight tooth gear. This also causes a wiping action when the gears mesh, helping to distribute lubricant and reduce wear.

Quiz 7: Differentials and Drive Axles Servicing Differentials and Drive Axles

A differential is needed between any two drive wheels, whether in a RWD, FWD, all-wheel drive (AWD), pr four-wheel drive (4WD).

Preload in bearings eliminates _____.

At least four bearings are found in all differentials: one over the drive pinion shaft with the other three supporting the differential case.

A _____ gearset is one in which any one pinion tooth comes into contact with only some of the ring gear teeth. One revolution of the ring gear is required to achieve all possible gear tooth contact combinations.

The main types of _____ are torque sensitive, speed sensitive, or mechanically locked.

Backlash is the clearance or play between two gears in a mesh.

A _____ gearset is one in which any one pinion tooth comes into contact with only some of the ring gear teeth, but more that one revolution of the ring gear is required to achieve all possible gear tooth contact combinations.

When engines are placed longitudinally in the car, they are said to have "north/south" placement.

The overhung-mounted pinion has three bearings supporting the pinion.

_____ express the number of turns the drive gear makes compared to one turn of the driven gear it mates with.

The differential case is mounted on _____ so that it is able to rotate independently of the drive axles.

The bearing of a _____ is located on the outside of the housing which places all of the vehicle's weight on the axle housing with no weight on the axle.

RWD final drives normally use a hypoid ring and pinion gearset that turns the power-flow 45 degrees from the drive shaft to the drive axles.

In a ring gear and pinion gear set, the pinion is the larger drive gear and the ring gear is the smaller driven gear.

The _____ is the final set of reduction gears the engine's power passes through on its way to the drive wheels.

Technician A says, upon heavy acceleration, the pinion attempts to climb up the ring gear due to an "equal and opposite" reaction. Technician B says this action attempts to raise the front of the differential housing. Who is correct?

Technician A says the hypoid gearset was designed to lower the body profile. Technician B says hypoid gears provide for smoother and quieter action. Who is correct?

To replace a ring and pinion gearset with one of the correct ratio, the ratio of the original set must be known.

Geared, torque-sensitive mechanical limited-slip differentials use _____ gears which react to an increase or decrease in torque at one of two shafts.

The teeth of a hypoid gear are _____, causing a wiping action when meshing.