Question 1

Common causes of driveline vibration are bad CV joints.

Accepted Answer

False

Question 2

The drive shaft has a natural vibration frequency.

Accepted Answer

The drive shaft, like any other rotating component, has a natural vibration frequency due to the way it oscillates or bends when it rotates. This frequency can cause vibrations that can be felt and potentially lead to issues such as wear and tear or even failure over time. It is important to balance and maintain the drive shaft to minimize these vibrations.

Question 3

The typical front-engine, front-wheel drive system has _____ joint(s).

Accepted Answer

Front-wheel drive systems typically use Constant Velocity (CV) joints instead of Universal joints. This allows for smoother power transfer from the engine to the wheels, as well as improved handling and fuel efficiency. Therefore, the best choice is D.

Question 4

Most drive shafts in a front-engine, rear-wheel drive car have at least _____.

Accepted Answer

Most drive shafts in a front-engine, rear-wheel drive car have at least two universal joints for flexibility and to accommodate the movement of the rear axle.

Question 5

A double Cardan Universal joint is comprised of three Cardan joints joined together by a yoke.

Accepted Answer

A double Cardan joint is comprised of two Cardan joints connected by an intermediate shaft, not three Cardan joints joined by a yoke.

Question 6

A drive shaft rotates at six to eight times the speed of the car's tires.

Accepted Answer

The drive shaft's rotational speed is directly proportional to the vehicle's speed and gear ratio, not necessarily six to eight times faster than the tires. It varies depending on the gear the vehicle is in and the design of the vehicle's drivetrain.

Question 7

The basic purpose of the universal joint is to allow the _____.

Accepted Answer

The universal joint allows for the drive angle between two parts of the drive train to change, which is important for maintaining a constant speed and torque transfer despite changes in the angle of the drive shaft. It does not affect the length of the drive shaft, support it at the middle, or make it easier to remove or install.

Question 8

Technician A says that balance pads should be checked when checking U-joints because they are sometimes missing. Technician B says that this is not necessary because the balance pads are firmly adhered. Who is correct?

Accepted Answer

Balance pads should be checked when checking U-joints as they can sometimes be missing or worn out, which can lead to vibration and damage to the driveshaft. Therefore, Technician A is correct while Technician B is incorrect.

Question 9

In normal automotive terms, suspension spring compression is called jounce, while the expansion of the suspension spring is called _____.

Accepted Answer

"Expansion of the suspension spring" is referred to as rebound in normal automotive terms. Bounce refers to the upward movement of the vehicle after hitting a bump or obstacle. Slippage and rotation are not related to the movement of the suspension spring.

Question 10

The short drive shafts or axles used on front-wheel drive (FWD), four-wheel drive (4WD), and rear-wheel drive (RWD) with independent rear suspension are called _____.

Accepted Answer

The correct term for the short drive shafts or axles used on FWD, 4WD, and RWD with independent rear suspension is half shafts.

Question 11

Four-wheel drive vehicles use two drive shafts, one to drive the front wheels and the other to drive the rear wheels.

Accepted Answer

Four-wheel drive vehicles typically use two drive shafts, with one connecting the front wheels to the transmission and another connecting the rear wheels to the transmission.

Question 12

_____ is a synthetic oil with magnetic particles, such as iron, suspended in it.

Accepted Answer

MR fluid (Magnetorheological fluid) is a synthetic oil with magnetic particles suspended in it. This fluid can change its viscosity and flow characteristics when exposed to a magnetic field, which allows it to be used in various applications such as shock absorbers and dampers in automobiles and aerospace engineering. Hydraulic fluid, transmission fluid, and 10W-50 motor oil do not generally contain magnetic particles.

Question 13

Drive shafts have a slip joint at one end of the drive shaft which permits the effective length of the drive shaft to change.

Accepted Answer

The slip joint allows for the drive shaft to change in length, typically to accommodate for the movement of the suspension system.

Question 14

The drive shaft is normally made of seamless steel or aluminum tubing with universal joint yokes at each end.

Accepted Answer

The statement is correct. Drive shafts are commonly made of seamless steel or aluminum tubing, and they have universal joint yokes at each end.

Question 15

Technician A says most drive shafts have a slip yoke and three universal joints. Technician B says a drive shaft may vibrate if the balance pads are missing off of the tube. Who is correct?

Accepted Answer

The answer of Technician A says most drive shafts have...

Question 16

A two-piece drive shaft is also referred to as a split drive shaft.

Accepted Answer

A two-piece drive shaft is indeed referred to as a split drive shaft.

Question 17

A drive shaft must smoothly transfer torque while rotating, changing length, and moving up and down.

Accepted Answer

A drive shaft is designed to smoothly transfer torque while accommodating changes in length and movement up and down, allowing for the smooth transfer of power from the engine to the wheels.

Question 18

The _____ is an assembly of one or two Universal joints connected to a shaft or tube used to transmit power from the transmission to the differential.

Accepted Answer

The description provided in the question clearly matches the definition of a driveshaft, also known as a propeller shaft. The other options, such as crankshaft and slip yoke, are components found within the drivetrain but do not match the definition given in the question. Driveline is a broader term that can encompass multiple components in the drivetrain, but it is not specific enough for the answer.

Question 19

What term describes the rotational speed at which an object begins to vibrate as it turns?

Accepted Answer

The term that describes the rotational speed at which an object begins to vibrate as it turns is critical speed.

Question 20

The most common drive shaft arrangement is called the torque tube design.

Accepted Answer

The most common drive shaft arrangement is called the Hotchkiss drive, which uses a simple setup with a drive shaft, universal joints, and rear differential, unlike the torque tube design that encases the drive shaft within a rigid tube.

Quiz 6: Drive Shafts and Universal Joints Servicing Drive Shafts and Universal Joints