2413: Chapters 6-8, 10

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

true

Technician A says a transfer case is an extra gear box on the back of a transmission. Technician B says a transfer case is mounted between the engine and the transmission. Who is correct?

A

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?

A

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

MR Fluid

The _____ has the role of recommending specifications and practices for the automotive industry.

Society of Automotive Engineers (SAE)

Many automotive components, such as alternators, ignition coils, starter solenoids, and magnetic pulse generators operate using principles of _____.

electromagnetism

A double Cardan Universal joint is comprised of three Cardan joints joined together by a yoke. (T/F)

false

A drive shaft rotates at six to eight times the speed of the car's tires. (T/F)

false

A locking hub is a type of clutch that engages the outer ends of the axle shafts from the wheel hub. (T/F)

false

All-wheel-drive systems give the driver the option of 2WD or 4WD. (T/F)

false

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

false

Common causes of driveline vibration are bad CV joints. (T/F)

false

In a ring gear and pinion gear set, the pinion is the larger drive gear and the ring gear is the smaller driven gear. (T/F)

false

Most automobile circuits work on AC, whereas the current in homes and buildings is DC. (T/F)

false

One ampere is equivalent to 10 billion electrons flowing past a given point in one second. (T/F)

false

Part-time four-wheel drive systems are automatically controlled systems. (T/F)

false

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. (T/F)

false

The Society of Automotive Engineers (SAE) provides standard definitions applicable to AWD and 4WD systems which is used consistently by manufacturers to provide clarity. (T/F)

false

The most common drive shaft arrangement is called the torque tube design. (T/F)

false

The overhung-mounted pinion has three bearings supporting the pinion. (T/F)

false

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

final drive

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

gear ratios

What part is used to prevent the lubricant from leaking out of the housing of a straight roller axle bearing?

grease seal

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 _____.

half shafts

The resistance to current flow produces _____, which can be measured to determine the amount of resistance.

heat

Part-time four-wheel drive _____.

is usually disconnected when driving on pavement

A viscous clutch, cone clutch, or a multiple-plate clutch are three types of clutches that may be used in a(n) _____ differential.

limited-slip center

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

limited-slip differential

Although the principles of operation are similar for all 4WD units, the components, location, and controls of the various systems differ primarily according to _____.

manufacturer and application

_____ is an in-vehicle networking system used to transfer data between electronic modules through a serial data bus.

multiplexing

Technician A says rheostats have three connections, one at each end of the resistance and one connection to a sliding contact with the resistor. Technician B says potentiometers have two connections, one at the power end of the resistance and one connected to a sliding contact with the resistor. Who is correct?

neither

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.

nonhunting

A 4WD vehicle may be shifted into four-wheel drive _____.

only according to the owner's manual instructions

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.

partial nonhunting

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

rebound

A(n) _____ is an electric switch which allows a small amount of current to control a much larger one.

relay

All vehicles sold in the United States after 1971 are required to have _____.

reverse lights

The Spicer style, mechanic's style (aka Detroit/Saginaw style), and the Cleveland style are styles of _____.

single universal joints

What is the central gear in a planetary gearset around which the rest of the gears rotate?

sun gear

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

true

A drive shaft must smoothly transfer torque while rotating, changing length, and moving up and down. (T/F)

true

A semiconductor can function as either a conductor or an insulator. (T/F)

true

A two-piece drive shaft is also referred to as a split drive shaft. (T/F)

true

Backlash is the clearance or play between two gears in a mesh. (T/F)

true

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

true

Four-wheel drive vehicles use two drive shafts, one to drive the front wheels and the other to drive the rear wheels. (T/F)

true

Four-wheel-drive is most useful when a vehicle is traveling off the road or on any slippery surface. (T/F)

true

Lapping is the process of using a grinding paste to produce a fine finish on the teeth of the two gears that will be in full contact with each other. (T/F)

true

Most transfer cases use drive chains. (T/F)

true

Most transfer cases, with low range available, use planetary gearsets. (T/F)

true

Some limited-slip differentials are gear-based (no internal clutches) units that transfer torque from a slipping wheel to the wheel with more traction. (T/F)

true

Some vehicles may be shifted into four-wheel drive at any time. (T/F)

true

The clutch safety switch insures that the vehicle will not start in gear. (T/F)

true

The drive shaft has a natural vibration frequency. (T/F)

true

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

true

The outer case of the transfer case is made of magnesium, aluminum, or cast iron and is filled with lubricant. (T/F)

true

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

true

Full-time four-wheel drive _____.

is never disconnected

Both 4WD and AWD systems add cost and weight to a vehicle. (T/F)

true

Preload in bearings eliminates _____.

looseness

Technician A says the Universal joint has a center cross with machined arms. Technician B says it has bearing cups that contain a set of ball bearings. Who is correct?

A

_____ systems automatically react to normal or slippery road conditions and are not designed for off-road use; rather, they are designed to increase vehicle performance in poor traction situations.

AWD

Technician A says direct current (DC) flows in two directions. Technician B says alternating current (AC) flows in two directions. Who is correct?

B

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?

B

Technician A says power can be locked into all four wheels merely by turning the locking hubs into the locked position. Technician B says some transfer cases use an electric switch to engage 4WD. Who is correct?

B

Technician A says that there are three designs of axle shaft bearings: ball-type, straight roller, and C-type roller bearings. Technician B says that the three designs are: ball-type, straight roller, and tapered roller bearings.Who is correct?

B

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

CV joints instead of universal

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

The main source of electrical power for a vehicle is stored in the _____.

battery

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

bearings

Technician A says a diode allows current to flow in only one direction. Technician B says transistors are semiconductor switching devices. Who is correct?

both

Technician A says magnetism is a source of electrical energy in an automobile. Technician B says a chemical reaction is a source of electrical energy in an automobile. Who is correct?

both

Technician A says seals that are incorrectly installed can cause a leak in a transfer case. Technician B says noises in a transfer case or a differential can be caused by bad bearings. Who is correct?

both

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?

both

Technician A says the mechanic's style U- joint bearing cups are held in place by metal lock rings. Technician B says some U- joints are held in place by injected nylon locks. Who is correct?

both

Technician A says the purpose of a transfer case is to transfer power to an additional drive axle. Technician B says most transfer cases have two speeds which affect the overall gear ratio of the vehicle. Who is correct?

both

Technician A says there may be three drive shafts connected to a transfer case. Technician B says one drive shaft is connected to the transfer case, directly from the transmission, and the other two are for driving the front and rear axles. Who is correct?

both

Technician A says upshift and shift lamps are controlled by the PCM. Technician B says upshift and shift lamps help the driver maximize fuel economy. Who is correct?

both

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?

both

While discussing the behavior of electricity, Technician A says that the amount of current which flows in a circuit is determined by the resistance in the circuit. Technician B says that as resistance goes up, the current goes down. Who is correct?

both

_____ is a suspension alignment term used to define the amount of centerline of a wheel is tilted inward or outward from the true vertical plane of the wheel.

camber

_____ occur when opposing operating angles of two Universal joints cancel the oscillations developed by the individual Universal joint.

cancelling angles

The _____, often referred to as the interaxle differential, allows the front and rear wheels to turn at different speeds and with different amounts of torque.

center differential

The _____ prevents the engine starting unless the clutch pedal is fully depressed.

clutch safety switch

An electrical circuit is considered _____ when there is a path connecting the positive and negative terminals of the electrical power source.

complete

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

critical speed

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

curved to follow a spiral

A _____ consists of two individual U-joints connected by a centering socket yoke and a center yoke that functions like a ball and socket.

double Cardan Universal joint

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

drive angle between two parts of the drive train to change

_____ are often used to link the input and output shafts in a transfer case and serve as a link that does not influence gear ratios.

drive chains

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.

drive shaft

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

two universal joints

_____ are used in antilock brake systems to measure the speed of the wheels.

wheel speed sensors

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

worm