270202k - Automatic Transmission Internal Operations Practice Exam

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Which gear set is used as the basic means of multiplying the twisting force (torque) from the engine to the driving wheels in the majority of modern automatic transmissions?

Helical gear sets Hypoid gear sets Planetary gear sets Worm gear sets

To achieve Direct Drive (1:1 ratio) in a simple planetary gear set, which of the following is required according to the laws of operation?

The sun gear must be held stationary by a band. The planetary carrier must be used as the input member. Two members must be locked together or driven at the same speed. The ring gear must be freewheeling (overrunning).

To transmit torque through any planetary gear system, regardless of its design, which three operational members must be present?

Sun gear, internal/ring gear, and planetary pinions. Drive member, held member, and freewheeling member. One input (drive) member, one output (driven) member, and one reaction (held) member. Planetary carrier, reaction plate, and output shaft.

A gear set arrangement that uses two simple planetary gear sets mounted on a common sun gear is known as the:

Tandem set. Planetary reduction unit. Simpson gear set. Overrunning clutch assembly.

In a simple planetary gear set, if the Planetary Carrier is held, and the Sun Gear is used as the input member, what is the resulting output combination?

Forward Reduction Reverse Overdrive Reverse Reduction Forward Overdrive

If a simple planetary gear set is configured for Forward Deep Reduction, which member is held stationary?

Sun Gear Planet Carrier Internal/Ring Gear Input Shaft

To achieve Forward Long Overdrive in a simple planetary gear set, the Internal/Ring Gear is held stationary. Which member must serve as the input member?

Sun Gear Planet Carrier Input Shaft Output Shaft

In a simple planetary gear set, if the Sun Gear is held stationary and the Internal/Ring Gear is used as the input member, which member serves as the output, providing Forward Reduction?

Sun Gear Shaft Rear Internal Gear Planet Carrier Output Shaft

What is the resulting operational condition in a simple planetary gear set if there is no held member and no drive member?

Direct Drive Forward Deep Reduction Neutral Reverse Reduction

If the Planet Carrier is held stationary and the Ring Gear is used as the input, what member provides the output for Reverse Overdrive?

Planetary Pinions Sun Gear Output Shaft Input Shaft

Planetary gear sets are designed to handle large torque loads for their size primarily because of what characteristic?

They use spur gears to reduce end thrust. The torque load is distributed over several planet pinion gears, providing more teeth in contact. They utilize a double-acting servo to apply the clutch. They operate exclusively in a locked 1:1 ratio.

The gears in a planetary set are considered to be in constant mesh. What primary benefit does this provide?

Enables the use of external tooth gears only. Allows for instantaneous servo application. Helps eliminate gear damage from gear clash when shifting gears. Permits the use of the clutch relief check valve.

The internal/ring gear is meshed with the planetary pinions. When the external tooth planetary pinions rotate inside the internal tooth ring gear, how do they rotate relative to each other?

In opposite directions. Only during deep reduction. In the same direction. They do not rotate; they are locked together.

What operational state is achieved in a simple planetary gear set when the Sun Gear is held stationary, and the Planet Carrier is the input member?

Reverse Reduction Forward Overdrive Forward Deep Reduction Direct Drive

What are the two types of clutches used to control planetary gear train assemblies in an automatic transmission?

Clutch brake and centrifugal clutch. Multiple-disc mechanical and overrunning mechanical. Overrunning (one-way) clutches and multiple-disc hydraulic clutches. Single-wrap and double-wrap clutch bands.

Which type of clutch is referred to as a wet-type clutch because it operates in automatic transmission fluid?

Overrunning clutch Sprag clutch Multiple-disc hydraulic clutch assembly Mechanical clutch brake

Which statement accurately describes the operation of overrunning (one-way) clutches?

They require continuous hydraulic controls for holding and freewheeling. They require periodic adjustment to maintain holding capacity. They are mechanically applied and released, which requires no hydraulic controls for their operation. They are used exclusively as a driving member to supply torque input.

What is the explicit functional purpose of the freewheeling action of a one-way clutch?

To hold a member of the planetary gear set to the case. To improve shift quality by eliminating a timing problem during band-to-band or band-to-clutch shifts. To provide a high degree of frictional drag in the overrun mode. To force the clutch relief check ball onto its seat.

In a multiple-disc clutch assembly, the steel plates are generally splined to which component?

The center hub The clutch piston The clutch drum or the transmission case The return spring retainer

What determines the torque capacity or torque-holding capacity of a multiple-disc clutch pack assembly?

The pressure of the return spring. The number of contacting surfaces (clutch plates and friction discs). The amount of residual oil in the drum. The amount of applied hydraulic mainline pressure.

What component is stacked alternately with steel plates to make up a clutch pack?

Waved snap rings Composition-faced (friction) plates Reaction plates Belleville springs

When a multiple-disc clutch is applied, what component compresses the plates, providing a drive between the drum and hub?

The wave plate The return spring The apply piston The snap ring

Some clutches use a waved steel plate in the clutch pack. What is the specific function of this plate?

To secure the friction plates to the hub. To act as a cushioning device. To lock the clutch drum to the case. To transfer power from the clutch drum to the input shaft.

The friction material used on clutch plates is made of which types of materials?

Sintered bronze or aluminum alloy. Semi-metallic or paper cellulose material. Cast iron or Teflon. High-quality forged steel.

The clutch friction plates are typically splined on the inner circumference to mesh with splines on which component?

The clutch drum or housing. The servo piston. The center hub of the member to which they are attached. The clutch return spring.

Most hydraulic clutches are applied by pressurized fluid and released by what component?

An accumulator A spring or springs A pressure regulator valve A shift rail

What component prevents oil leakage between the stationary clutch support and a rotating clutch drum when hydraulic pressure is applied?

Clutch apply piston Cast iron or Teflon seal rings Friction plates The clutch relief check valve

Seal rings provide efficient sealing primarily due to a built-in tension or expansion force that ensures what initial condition?

The fluid is restricted by the restrictive orifice. Initial contact with the bore. The fluid pressure is equalized on both sides of the clutch. The stator support is locked to the transmission case.

A Scarf Cut refers to which characteristic of a Teflon seal ring?

A coarse finish on the edge left from manufacturing. The ends are cut on an angle. A square-cut end on a cast iron seal. A one-piece rubber seal design.

Cast iron seal rings are distinguished by always having an opening, which may be secured by which two types of ends?

One-piece or lathe-cut. Square-cut (butt joint) or interlocking hooks. Round O-ring or D-cut O-ring. Rubber or neoprene.

Lathe-cut seals are always one-piece seals made of neoprene or Viton. What unique feature of their edge aids in providing a tight seal?

The interlocking hooked ends. The ability to freewheel in the overrun mode. A coarse finish left over from the manufacturing process. A special spring retainer that compresses the rubber.

The clutch drum, which houses the complete clutch assembly, may be made of which three materials?

Steel plate, neoprene, or Teflon. Cast iron, aluminum, or lightweight stamped steel. Brass, bronze, or copper. Steel strap, Belleville spring steel, or cast iron band material.

How are clutch pistons applied and released?

Applied by spring force and released by centrifugal force. Applied by mainline oil pressure and released by a spring or springs. Applied by an accumulator and released by a servo piston. Applied by centrifugal force and released by the brake switch.

A single Belleville type return spring provides an additional purpose besides returning the piston. What is this purpose?

To accommodate the short stroking distance required to apply the clutch. To eliminate the need for a pressure plate. It provides a mechanical advantage lever system for applying the clutch. It acts as a stationary anchor point for the clutch drum.

What is the function of the small steel ball-type check valve found in some clutch pistons or drums?

To restrict fluid flow to the clutch plates. To lock the clutch drum to the transmission case. To allow residual oil to escape when the clutch is released and turning at high RPM. To force the apply piston back into its shallow bore.

Without the clutch relief check valve, why might the clutch become partially applied during high RPM rotation when released?

The accumulator would fail to cushion the shift. Residual oil would be forced outward by the centrifugal force of the rotating clutch. The mainline oil pressure would override the return spring force. The servo piston would be forced into the released position.

Which of the following is NOT listed as a device used to smooth the engagement (cushion the shock) of clutch assemblies?

Waved snap rings Rubber cushion ring Accumulator Torsional dampeners

How does a waved snap ring help eliminate some of the harshness of a clutch apply?

It acts as a pressure regulator to reduce mainline pressure. Its straightening or flattening action is compressed flat, allowing full pressure to build within the clutch. It allows for the controlled escape of oil and vapour during engagement. It forces the clutch drum to align with the center hub.

An accumulator functions in the clutch apply circuit to control harshness or aggressiveness. How is the accumulator specifically classified relative to the clutch assembly?

As a type of clutch piston. As a type of Belleville spring. It is not an integral part of the clutch assembly. As a clutch cushioning device that uses centrifugal force.

How does a piston type accumulator cushion the application of a clutch?

By restricting the flow of oil through a filter mesh. By instantly reversing the oil flow. It absorbs fluid as the piston strokes, making pressure buildup more gradual and clutch engagement smooth. By applying hydraulic pressure directly against the return spring.

What is the fundamental role of a transmission band?

To provide driving torque to the planetary gear set. To act as a flexible contracting brake assembly that is always used as a holding (reaction) member. To provide a permanent 1:1 ratio once the coupling point is reached. To equalize the speed difference between two planetary members.

What characteristics of a transmission band primarily determine its holding ability?

The diameter of the drum it surrounds and the coefficient of friction. The length and width of the band and the amount of force applied against the band's anchored end. The thickness of the band and the frequency of adjustment. The material of the clutch drum (cast iron or aluminum).

Which design feature allows the transmission band to be applied with less hydraulic pressure?

The use of a double-wrap design only. The self-disengagement characteristic. The apply servo is mounted so that force is applied in the same direction as the drum rotation. The reliance on helical gearing to reduce end thrust.

Which type of band design provides greater holding ability due to the self-energizing or wrap-around action of its connecting segments?

Single-wrap band Steel strap band Double-wrap band Cast iron band

The friction lining of a transmission band is either semi-metallic or organic. In most applications, when the band is used to hold a stationary drum (Manual Low (L1) or Reverse (R)), which friction material is used?

Organic (paper pulp or cellulose). Semi-metallic material (can withstand high unit pressures). Rubber cushion ring. Teflon or Vitton.

What component is a hydraulically operated piston used to convert hydraulic pressure into mechanical force to apply a band within a transmission?

An accumulator A check valve A servo assembly A detent pin

Single-acting servos (simple servo design) are generally used for which applications?

Those that involve a timed band release during upshifts. Those that require a very large mechanical advantage. Applications that do not involve automatic upshifts or timed band releases, such as Manual Low (ML) or Reverse (R). Applications requiring the servo to also act as an accumulator.

A Double-Acting Servo (Compound Servo Design) releases the band when hydraulic pressure is sent to the release side (spring side) of the piston. What is the state of the apply pressure during this release?

Apply pressure is shut off completely. Apply pressure remains on the apply side of the servo piston. Release pressure is less than the apply pressure. The servo coil spring forces the piston to stroke forward.

What is the classification of clutch plates listed as a common replacement component when a clutch assembly fails?

Waved steel plates Clutch plates Thrust bearings Planetary gear set

When a band fails, which component is listed as a related sales item?

Clutch plates Seals Transmission filter Planetary gear set

Module 270202k — Automatic Transmission Internal Operations