Question 1

Which of the following parts is LEAST-Likely included in the driveline?
A) Driveshaft
B) Axles and axle bearings
C) Locking hub
D) Differential

Accepted Answer

The locking hub is part of the wheel-end or hub assembly on four-wheel-drive and some all-wheel-drive vehicles, not a central component of the driveline. The driveline typically includes the driveshaft, axles, axle bearings, and differential, which transmit power from the transmission to the wheels.

Question 2

The most popular universal joint design is called a ____.
A) ball and trunnion
B) pumpkin
C) cross and yoke
D) swing axle

Accepted Answer

The most popular universal joint design is called a "cross and yoke." This design allows for the transmission of rotary motion between two shafts that are not in direct line with each other, commonly used in the drivelines of vehicles.

Question 3

While having a discussion, Technician A says that the purpose of a differential is to transfer power from the driveline to the wheels. Technician B says that it increases engine torque by providing a final drive gear reduction, usually of about 2.5 to 3.5 to 1. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Both Technician A and Technician B are correct. The differential does transfer power from the driveline to the wheels, allowing them to rotate at different speeds when necessary, such as during turning. It also provides a final drive gear reduction, which increases the torque available to the wheels, typically in the range mentioned by Technician B.

Question 4

On rear-wheel-drive vehicles, ____________________ is a term that describes the parts that transfer power from the transmission to the rear wheels.

Accepted Answer

The answer of On rear-wheel-drive vehicles, ____________________ is a term...

Question 5

While having a discussion, Technician A says that automatic hubs always disengage when four-wheel drive is shut off. Technician B says that they only work in reverse. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

Automatic hubs do not always disengage when four-wheel drive is shut off; they typically disengage when the vehicle is put into reverse or when a certain action is performed, depending on the design. They do not work only in reverse; this is a misunderstanding of their function.

Question 6

The pinion gear drives the ring gear.

Accepted Answer

The pinion gear, which is connected to the vehicle's driveshaft, engages and drives the larger ring gear to transmit power to the wheels.

Question 7

With a(n) ____________________, one pinion tooth will contact two or three different ring gear teeth during one revolution and two or three different teeth the next revolution. At the third revolution it will be back to the same teeth on the ring gear.

Accepted Answer

The answer of With a(n) ____________________, one pinion tooth will...

Question 8

In a planetary gearset, the pinion gear is lower than the centerline of the ring gear.

Accepted Answer

In a planetary gearset, the pinion gears (also known as planet gears) revolve around the central sun gear and are aligned with the centerline of the ring gear, not below it.

Question 9

All of the following statements are true EXCEPT:
A) a standard differential allows one wheel to rotate if it begins to slip.
B) a limited slip differential locks the spider gears when one wheel starts to lose traction.
C) if there are 10 teeth on the pinion gear and 33 teeth on the ring gear, the ratio is 5.30:1.
D) when torque is applied to the clutch pack, the side gear locks to the case, causing the wheel on that side to be driven.

Accepted Answer

The correct gear ratio for a pinion gear with 10 teeth and a ring gear with 33 teeth is calculated by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear, which is 33/10 = 3.30:1, not 5.30:1 as stated.

Question 10

The vibration caused by the speeding up and slowing down of the driveshaft can be canceled by putting two Cardan U-joints next to each other.

Accepted Answer

When two Cardan U-joints are placed in series with their axes carefully aligned, the angular velocity variations introduced by the first U-joint can be canceled out by the second, reducing vibration.

Question 11

Replacement joints usually have a zerk fitting for lubrication after installation and during service.

Accepted Answer

The answer of Replacement joints usually have a zerk fitting...

Question 12

The side gears and differential pinions are called ____________________.

Accepted Answer

The answer of The side gears and differential pinions are...

Question 13

Most passenger cars have a single driveshaft, but a vehicle with a longer wheel base will MOST-Likely have a:
A) two-piece drive shaft
B) three-piece drive shaft
C) four-piece drive shaft
D) five-piece drive shaft

Accepted Answer

Vehicles with longer wheelbases often use a two-piece driveshaft to accommodate the greater distance between the transmission and the rear axle, providing better balance and reducing vibration.

Question 14

The part that is MOST-Likely a type of constant velocity universal joint is the:
A) halfshaft
B) driveline
C) tripod tulip
D) gearset

Accepted Answer

The tripod tulip is a part of a constant velocity (CV) joint, which allows a drive shaft to transmit power through a variable angle, at constant rotational speed, without an appreciable increase in friction or play.

Question 15

In ____, power flows through the locked planetary gearset to the mainshaft and to the rear differential.
A) two-wheel-drive high range (2H)
B) two-wheel-drive low range (2L)
C) four-wheel-drive high range (4H)
D) four-wheel-drive low range (4L)

Accepted Answer

The answer of In ____, power flows through the locked...

Question 16

All of the following statements are true EXCEPT:
A) drive axles usually support the weight of the vehicle.
B) it is important that tires be the same size on all limited slip differentials.
C) a bearing retainer is installed on the axle before the bearing is pressed on to provide a means of bolting the assembly to the brake backing plate.
D) semi-floating bearings are found on trucks.

Accepted Answer

The answer of All of the following statements are true...

Question 17

Front-wheel-drive vehicles have a transaxle with two ____________________ that deliver power to the front wheels.

Accepted Answer

The answer of Front-wheel-drive vehicles have a transaxle with two...

Question 18

With a hunting gearset, one tooth on the pinion gear meshes with the same tooth on the ring gear again and again, rather than "hunting" for all of the rest of the gear teeth.

Accepted Answer

In a hunting gearset, each tooth on the pinion will eventually mesh with every tooth on the ring gear, preventing the same teeth from meshing together repeatedly and promoting even wear across all teeth.

Question 19

With a(n) ____________________ gearset, one pinion gear tooth will move around the ring gear until it has contacted each one of its teeth.

Accepted Answer

The answer of With a(n) ____________________ gearset, one pinion gear...

Question 20

Which of the following is LEAST-Likely a component of a differential assembly?
A) Ring gear
B) Axle
C) Drive pinion
D) Thinwall

Accepted Answer

Thinwall is not typically a component of a differential assembly. Differential assemblies mainly consist of gears and shafts like the ring gear, axle, and drive pinion, which are integral for transmitting power from the driveshaft to the wheels. Thinwall does not fit into this category as it is not a standard term or component associated with differentials.

Quiz 75: Driveline Operation

Which of the following parts is LEAST-Likely included in the driveline?

The most popular universal joint design is called a ____.

While having a discussion, Technician A says that the purpose of a differential is to transfer power from the driveline to the wheels. Technician B says that it increases engine torque by providing a final drive gear reduction, usually of about 2.5 to 3.5 to 1. Who is correct?

On rear-wheel-drive vehicles, ____________________ is a term that describes the parts that transfer power from the transmission to the rear wheels.

While having a discussion, Technician A says that automatic hubs always disengage when four-wheel drive is shut off. Technician B says that they only work in reverse. Who is correct?

The pinion gear drives the ring gear.

With a(n) ____________________, one pinion tooth will contact two or three different ring gear teeth during one revolution and two or three different teeth the next revolution. At the third revolution it will be back to the same teeth on the ring gear.

In a planetary gearset, the pinion gear is lower than the centerline of the ring gear.

All of the following statements are true EXCEPT:

The vibration caused by the speeding up and slowing down of the driveshaft can be canceled by putting two Cardan U-joints next to each other.

Replacement joints usually have a zerk fitting for lubrication after installation and during service.

The side gears and differential pinions are called ____________________.

Most passenger cars have a single driveshaft, but a vehicle with a longer wheel base will MOST-Likely have a:

The part that is MOST-Likely a type of constant velocity universal joint is the:

In ____, power flows through the locked planetary gearset to the mainshaft and to the rear differential.

All of the following statements are true EXCEPT:

Front-wheel-drive vehicles have a transaxle with two ____________________ that deliver power to the front wheels.

With a hunting gearset, one tooth on the pinion gear meshes with the same tooth on the ring gear again and again, rather than "hunting" for all of the rest of the gear teeth.

With a(n) ____________________ gearset, one pinion gear tooth will move around the ring gear until it has contacted each one of its teeth.

Which of the following is LEAST-Likely a component of a differential assembly?