Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

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?

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

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?

Accepted Answer

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

Question 8

Which of the following statements is correct concerning modulator pressure?

Accepted Answer

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

Question 9

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

Accepted Answer

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

Question 10

Which of the following are types of integral retarders?

Accepted Answer

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

Question 11

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?

Accepted Answer

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

Question 12

When should governor pressure be at its highest?

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

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?

Accepted Answer

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

Question 15

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?

Accepted Answer

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

Question 16

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

Accepted Answer

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

Question 17

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?

Accepted Answer

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

Question 18

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

Accepted Answer

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

Question 19

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?

Accepted Answer

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

Question 20

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?

Accepted Answer

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

Exam 18: Automatic Transmissions

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

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

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

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?

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

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

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?

Which of the following statements is correct concerning modulator pressure?

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

Which of the following are types of integral retarders?

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?

When should governor pressure be at its highest?

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

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?

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

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?

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

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?

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?

Introduction to Servicing Heavy-Duty Trucks

Shop Safety and Operations

Tools and Fasteners

Preventive Maintenance Program

Fundamentals of Electricity

Fundamentals of Electronics and Computers

Batteries

Charging Systems

Cranking Systems

Chassis Electrical Circuits

Diagnosis and Repair of Electronic Circuits

Multiplexing

Hydraulics

Clutches

Standard Transmissions

Standard Transmission Servicing

Torque Converters

Automatic Transmission Maintenance

Electronically Automated Standard Transmissions

Electronically Controlled Automatic Transmissions Ecats

Driveshaft Assemblies

Heavy-Duty Truck Axles

Heavy-Duty Truck Axle Service and Repair

Steering and Alignment

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Heavy-Duty Heating, ventilation, and Air Conditioning Systems

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