Transmission Fundamentals Part B

Question 1

In most twin countershaft transmissions, which of the following does the auxiliary section not provide?

a. reverse gearing
b. range gearing
c. splitter gearing
d. deep reduction gearing

Answer 1

a. reverse gearing

Question 2

The auxiliary section uses the synchronizer to aid in the:

a. reverse shift
b. range shift
c. splitter shift
d. deep reduction shift

Answer 2

b. range shift

Question 3

The output shaft:

a. Delivers torque to the driveline
b. Is supported on tapered roller bearings.
c. Is splined to the synchronizer sliding clutch.
d. All of the above.

Answer 3

D. All of the above.

Question 4

The three speed auxiliary section provides:

a. 15 usable gears
b. 18 usable gears
c. 13 usable gears
d. 12 usable gears

Answer 4

d. 12 usable gears

Question 5

Identify the two methods of lubrication used on multiple countershaft transmissions.

Answer 5

Splash

Pressure

Question 6

Transmissions that utilize splash lubrication generally filter their oil by means of:

Answer 6

Magnetic drain plugs or magnets on the bottom of the case.

Question 7

Which of the following best defines a hybrid drive vehicle?

a. any vehicle that has two or more drive axles
b. any vehicle that has two or more methods of propulsion.
c. any vehicle that has two or more electrical systems
d. any vehicle that is propelled using hydrualics.

Answer 7

b. any vehicle that has two or more methods of propulsion.

Question 8

Identify the three key components of a diesel parallel electric hybrid.

Answer 8

a. motor/generator
b. inverter
c. power electronics carrier

Question 9

Why are lithium ion batteries desirable for electric hybrid applications?

a. high discharge rates and low storage capacity
b. high discharge rates and high storage capacity
c. low discharge rates and high storage capacity
d. low discharge rates and low storage capacity

Answer 9

c. low discharge rates and high storage capacity

Question 10

What effect does coasting or braking have on the lithium ion batteries?

a. batteries are sulphated
b. batteries are ionized
c. batteries are discharged
d. batteries are charged.

Answer 10

d. batteries are charged.

Question 11

Explain the two functions of the hydraulic pump/motor.

Answer 11

a. During coast or regenerative braking it provides the oil flow into the accumulator to pressurize the system.
b. During the propel mode the flow of oil is reversed and the pump acts as a hydraulic motor to apply torque to the driveline.

Question 12

During propulsion, explain the function of the accumulator, hydraulic motor and transfer case.

Answer 12

Oil flows from the high pressure accumulator to the pump/motor. The oil causes the pump/motor to operate as a motor. The motor transfers the fluid energy to the transfer case which converts the fluid into mechanical energy. The transfer case applies torque to the drive line to assist with the propulsion of the vehicle.

Question 13

In a diesel hydraulic hybrid, what is the minimum amount of time to wait for the accumulator to drain after shut down.

a. 3 minutes
b. 5 minutes
c. 10 minutes
d. 12 minutes

Answer 13

b. 5 minutes

Question 14

The auxiliary drive gears torque from the auxiliary countershafts.
True
False

Answer 14

False

Question 15

The purpose of the range splitter and deep reduction cylinders is to:

a. transmit the gearshift lever actions to shift the auxiliary section sliding clutches.
b. use the air signal to shift the main section sliding clutches.
c. use the air signal to shift the auxiliary section sliding gears.
d. use the air signal to shift the auxiliary section sliding clutches.

Answer 15

d. use the air signal to shift the auxiliary section sliding clutches.

Question 16

The two speed auxiliary section provides:

a. reduction and direct.
b. reduction and overdrive.
c. direct and overdrive.
d. direct and neutral.

Answer 16

a. reduction and direct.

Question 17

Which position provides direct drive in the four speed auxiliary section?

a. low range, low splitter.
b. low range, high splitter.
c. high range, low splitter.
d. high range, high splitter.

Answer 17

d. high range, high splitter.

Question 18

When a spin-on type of oil filter is used on a transmission lubrication system, the filter is located between the oil cooler and the:

a. oil drain plug.
b. pump outlet port.
c. pump inlet port.
d. screen mesh.

Answer 18

b. pump outlet port.

Question 19

How should you check the oil level of the transmission?

Answer 19

Always check the transmission lubricant level with the vehicle on a level surface, front to rear and side to side. Clean the area around the filler plug and ensure the oil is level with the lower edge of the filler plug opening.

Question 20

Explain the difference between a series hybrid and a parallel hybrid.

Answer 20

In a series hybrid the engine never directly propels the vehicle. In a parallel hybrid an electric motor or a hydraulic motor between the engine and transmission assists with the propulsion of the vehicle.

Question 21

What are the 2 primary functions of the motor generator?

Answer 21

a. to propel the vehicle

b. to charge the battery pack

Question 22

During diesel electric propel mode, what does the electric assist that the motor provides have on the diesel engine?

a. lowers engine duty cycle.
b. increases engine duty cycle.
c. increases the engine’s fuel consumption.
d. lowers the engine RPM

Answer 22

a. lowers engine duty cycle

Question 23

In a diesel hydraulic hybrid assembly which component receives energy from the engine or rear axle?

a. hydraulic motor/pump
b. accumulator
c. transfer case
d. cooler

Answer 23

c. transfer case

Question 24

Explain the function of the accumulator in a diesel hydraulic hybrid vehicle.

Answer 24

Stores energy for the hydraulic launch system.

Question 25

In a diesel electric hybrid, what color are the high voltage cables?

a. orange
b. red
c. yellow
d. green

Answer 25

a. orange