Deck 18: Automatic Transmissions

Question 1

What will result in a simple planetary gearset whenever the carrier is the output member?

A) torque increase
B) torque decrease
C) reverse rotation
D) speed increase

Answer 1

A

Question 2

How is the power take-off gear in an Allison hydromechanical transmission driven?

A) turbine in the torque converter
B) front planetary ring gear
C) rear planetary carrier
D) output shaft

Answer 2

A

Question 3

What will be the output result in a planetary gearset whenever the carrier is the input member?

A) speed decrease
B) torque increase
C) reverse
D) speed increase

Answer 3

D

Question 4

In which gear selector position on an Allison hydromechanical transmission should main pressure be at its highest?

A) N
B) D
C) R
D) D3

Question 5

What drives the oil pump in a typical Allison hydromechanical transmission?

A) torque converter rear hub
B) transmission input shaft
C) transmission output shaft
D) torque converter front hub

Question 6

When the sun gear of a simple planetary gearset is the input member and the ring gear is held stationary,which of the following best describes the output?

A) slow overdrive
B) maximum forward reduction
C) maximum overdrive
D) minimum forward reduction

Question 7

When both the ring gear and the sun gear of a simple planetary gearset are driven in the same direction at the same speed,at what speed is the carrier turning?

A) a little slower
B) faster
C) same speed
D) much slower

Question 8

Technician A says that the number of planetary pinions in a carrier depends upon the torque load that the gearset is expected to carry.Technician B says that the planetary carrier assembly is capable of exerting the most leverage on the axis of a planetary gearset.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 9

How are multiple disc clutches used in truck automatic transmissions?

A) braking devices
B) power transfer
C) both A and B
D) neither A nor B

Question 10

Which of the following is an advantage of a planetary gearset?

A) gear loads are divided equally
B) reverse capability
C) multiple ratios
D) all of the above

Question 11

Which of the following statements is correct concerning modulator pressure?

A) affects both upshifts and downshifts
B) directly related to accelerator position
C) sourced from main pressure
D) all of the above

Question 12

Which of the following factors determines the transmission governor pressure?

A) output shaft speed
B) forward range ratio selected
C) torque output of the transmission
D) engine RPM

Question 13

In a typical truck Allison transmission,when a low planetary gearset is used,where is it located?

A) directly behind the torque converter
B) in front of the first planetary gearset
C) as the center planetary gearset
D) at the rear of the transmission

Question 14

When the carrier in a simple planetary gearset is held and the sun gear is the input member,at what speed and direction is the ring gear turning?

A) reverse direction,slower speed
B) reverse direction,faster speed
C) same direction,slower speed
D) same direction,faster speed

Question 15

Which of the following can influence upshifts in an Allison hydromechanical transmission?

A) road speed
B) throttle position
C) both A and B
D) neither A nor B

Question 16

Where does the converter/cooler/lubrication oil circuit originate?

A) pressure regulator valve
B) selector valve
C) governor
D) modulator

Question 17

Which of the following is NOT a reason for grooving automatic transmission friction discs?

A) assist in cooling
B) act as a wear indicator
C) provide channels to drain fluid
D) retain some fluid to lubricate the discs

Question 18

What does the number of clutch plates and friction discs used in a clutch pack depend on?

A) transmission size and rating
B) transmission application
C) both A and B
D) neither A nor B

Question 19

Which of the following statements is true of an Allison hydromechanical transmission?

A) in the forward ranges,they always start in first or low gear
B) some models are designed to start in second gear
C) an inhibitor valve prevents upshifting until a higher road speed is achieved
D) trimmer valves are used to prevent overspeed conditions

Question 20

How many planetary gearsets are used in a four-speed,Allison hydromechanical automatic transmission?

A) 2
B) 3
C) 4
D) 5

Question 21

When should governor pressure be at its highest?

A) in drive range at 10 mph
B) at the highest road speed
C) in drive range at full stall
D) in reverse

Question 22

Technician A says that an Allison output retarder functions independently from engine rpm during braking cycles.Technician B says that Allision output retarder efficiency is not influenced by the transmission ratio during a braking cycle.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 23

Technician A says that there are six separate clutches in an Allison four-speed transmission.Technician B says that there are six separate clutches in an Allision five-speed transmission.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 24

Technician A says that when the first and fourth clutches are applied in an Allison hydromechanical 4-speed transmission,the output will be reverse.Technician B says that when the first and fourth clutches are applied in an Allison 5-speed transmission,the output will be reverse.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 25

How many planetary gearsets are there in an Allison 5-speed hydromechanical transmission?

A) two
B) three
C) four
D) five

Question 26

Which of the following running conditions would produce the highest modulator pressure?

A) engine idling
B) downshift
C) maximum engine RPM
D) peak engine torque

Question 27

If only the first speed clutch is applied in an Allison hydromechanical transmission,what would the output ratio?

A) first gear
B) reverse
C) neutral
D) one to one ratio

Question 28

Technician A says that to produce fifth gear in an Allison hydromechanical 5-speed transmission the fourth and forward clutches must be applied.Technician B says that to produce fourth gear in the same transmission,the second and forward clutches must be applied.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 29

How many planetary gearsets are their in an Allison 4-speed hydromechanical transmission?

A) one
B) two
C) three
D) four

Question 30

What type of valve is used in an Allison hydromechanical transmission to ensure that the control system upstream from the valve,has sufficient pressure during shifts to execute its automatic functions?

A) inhibitor valve
B) priority valve
C) trimmer valve
D) modulator valve

Question 31

What is used to regulate main pressure in an Allison hydromechanical transmission?

A) pressure relief valve
B) main pressure regulator valve
C) forward regulator pressure valve
D) governor

Question 32

Which of the following are types of integral retarders?

A) input retarder
B) output retarder
C) both A and B
D) driveline retarder

Question 33

Which of the following types of chassis auxiliary braking devices can be integrated into an Allison automatic transmission?

A) BrakeSaver
B) input retarder
C) driveline retarder
D) parking pawl

Question 34

What is used to avoid shift shock in Allison hydromechanical transmissions?

A) modulator valve
B) governor
C) inhibitor
D) trimmer valve

Question 35

What regulates converter-in pressure in the torque converter used with an Allison hydromechanical transmission?

A) converter pressure regulator valve
B) main pressure regulator valve
C) safety pressure relief valve
D) diverter valve

Question 36

In an Allison 5-speed hydromechanical transmission,what prevents a downshift from 2nd gear into 1st when the road speed is too high?

A) modulator valve
B) trimmer valve
C) inhibitor valve
D) priority valve

Question 37

Which of the following can increase the retarding efficiency of an input retarder on an Allision hydromechanical automatic transmission during braking?

A) accelerating the engine
B) downshifting
C) upshifting
D) selecting neutral

Question 38

Technician A says that when the first and forward clutches are applied in an Allison hydromechanical 5-speed transmission,the output is first gear.Technician B says that to produce reverse in the same transmission,the reverse and first clutches must be applied.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 39

Technician A says that when a truck with an Allison hydromechanical transmission has to be towed,the driveline should be disconnected so that the transmission pump is not driven.Technician B says that an Allison hydromechanical transmission oil pump is driven at any time the transmission output shaft is turned.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 40

Technician A says that an Allison hydromechanical transmission can be operated in PTO mode when the engine is running and the transmission is in neutral.Technician B says that an Allison transmission PTO gear is driven by the torque converter turbine.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 41

Technician A says that the multiple components that make up a planetary carrier assembly count as a single gear.Technician B says that if there is to be output from a planetary gearset,the planetary pinions in the planetary carrier MUST be rotating on their own axes.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question 42

Technician A says that when comparing the three planetary members to standard gear sizes,the planetary ring gear can be considered the intermediate gear.Technician B says that the planetary sun gear should be considered the smallest gear member.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B