Question 1

What effects clutch control in a Caterpillar CX transmission?

Accepted Answer

A)  non-latching solenoids 
B)  latching solenoids 
C)  PWM actuated ECPCs 
D)  V-Ref 
A)  non-latching solenoids 
B)  latching solenoids 
C)  PWM actuated ECPCs 
D)  V-Ref C

Question 2

Which of the following are advantages of using secondary submodulation of solenoids?

Accepted Answer

A)  heat in the solenoid coil is minimized 
B)  solenoid performance is more consistent during operating variables 
C)  both A and B 
D)  neither A nor B 
A)  heat in the solenoid coil is minimized 
B)  solenoid performance is more consistent during operating variables 
C)  both A and B 
D)  neither A nor B C

Question 3

How many forward ratios are there in an Allison TC10?

Accepted Answer

A)  Five 
B)  Ten 
C)  Twelve 
D)  Twenty 
A)  Five 
B)  Ten 
C)  Twelve 
D)  Twenty B

Question 4

Which of the following best describes the function of the Allison WT serial communications interface (SCI)?

Accepted Answer

A)  enables one-way J1939 bus communications 
B)  enables two-way J1939 bus communications 
C)  connects WT ECU directly to digital display (D
D)  
D)  connects WT ECU directly to a digital diagnostic reader (DDR) 
A)  enables one-way J1939 bus communications 
B)  enables two-way J1939 bus communications 
C)  connects WT ECU directly to digital display (D
D)  
D)  connects WT ECU directly to a digital diagnostic reader (DDR)

Question 5

Technician A says that the WT mainshaft is splined to the rotating clutch module.Technician B says that the mainshaft connects all three planetary gearsets in a WT transmission.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 6

Which of the folowing is a full-authority ECAT?

Accepted Answer

A)  Allison WT 
B)  Allison TC 
C)  Caterpillar CX 
D)  All of the above 
A)  Allison WT 
B)  Allison TC 
C)  Caterpillar CX 
D)  All of the above

Question 7

What lubricant do Caterpillar recommend for use in their CX family of onhighway transmissions?

Accepted Answer

A)  synthetic E-500 
B)  Dexron II 
C)  Dexron III 
D)  synthetic AT-1 
A)  synthetic E-500 
B)  Dexron II 
C)  Dexron III 
D)  synthetic AT-1

Question 8

What is used to manage main pressure in an ECAT?

Accepted Answer

A)  main pressure regualator 
B)  modulator valve 
C)  governor valve 
D)  backfill valve 
A)  main pressure regualator 
B)  modulator valve 
C)  governor valve 
D)  backfill valve

Question 9

How many forward ratios are there in a Caterpillar CX35 vocational transmission?

Accepted Answer

A)  four 
B)  five 
C)  six 
D)  eight 
A)  four 
B)  five 
C)  six 
D)  eight

Question 10

Which of these clutches puts an Allison WT drop-box into extra-low range?

Accepted Answer

A)  C4 
B)  C5 
C)  C6 
D)  C7 
A)  C4 
B)  C5 
C)  C6 
D)  C7

Question 11

Which of the following true statements is true regarding solenoid operation in an Allison ECATs?

Accepted Answer

A)  non-latching solenoids permit hydraulic flow only when electrically energized 
B)  latching solenoids can be switched with either straight or reversed polarity 
C)  latching solenoids replace the shift signal valves used in non-electronic transmissions 
D)  all of the above 
A)  non-latching solenoids permit hydraulic flow only when electrically energized 
B)  latching solenoids can be switched with either straight or reversed polarity 
C)  latching solenoids replace the shift signal valves used in non-electronic transmissions 
D)  all of the above

Question 12

Which of the following should be true of a powershift transmission?

Accepted Answer

A)  shifts under full acceleration without breaking driveline torque 
B)  zero slip loss during ratio upshifts 
C)  lower skill level required of driver 
D)  all of the above 
A)  shifts under full acceleration without breaking driveline torque 
B)  zero slip loss during ratio upshifts 
C)  lower skill level required of driver 
D)  all of the above

Question 13

What is indicated when the WT Digital Display is showing a flashing 3?

Accepted Answer

A)  transmission is about to shift into range 3 
B)  transmission is in range 3 awaiting either an upshift or downshift 
C)  trouble code 3 has been set in the ECU fault log 
D)  shift will occur in 3 seconds 
A)  transmission is about to shift into range 3 
B)  transmission is in range 3 awaiting either an upshift or downshift 
C)  trouble code 3 has been set in the ECU fault log 
D)  shift will occur in 3 seconds

Question 14

Which of the following descriptions best describes the older Allison CEC family of electronically-managed transmissions?

Accepted Answer

A)  full-authority,electronically-managed 
B)  partial-authority,electronically managed 
C)  full-authority,hydromechanically-controlled 
D)  partial-authority electronics using an all-new modular gearset platform 
A)  full-authority,electronically-managed 
B)  partial-authority,electronically managed 
C)  full-authority,hydromechanically-controlled 
D)  partial-authority electronics using an all-new modular gearset platform

Question 15

Technician A says that when the WT digital display (DD)is blank,the reason could be a problem in the electrical circuit to the shift selector.Technician B says that when the WT DD is blank,the data link may have failed.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 pressure values would be within specification for main pressure in a Caterpillar CX transmission?

Accepted Answer

A)  125 psi 
B)  250 psi 
C)  350 psi 
D)  700 psi 
A)  125 psi 
B)  250 psi 
C)  350 psi 
D)  700 psi

Question 17

Where is the main pressure tap located on a Caterpillar CX transmission?

Accepted Answer

A)  filter pad housing 
B)  ECPC valve housing 
C)  shift tower 
D)  ECU heat sink 
A)  filter pad housing 
B)  ECPC valve housing 
C)  shift tower 
D)  ECU heat sink

Question 18

Which of the following Allison WT clutches are designed to transmit rotating torque to the planetary gears?

Accepted Answer

A)  C1 and C2 
B)  C2 and C3 
C)  C3 and C4 
D)  C6 and C7 
A)  C1 and C2 
B)  C2 and C3 
C)  C3 and C4 
D)  C6 and C7

Question 19

What type of fluid level sensor is used to signal sump level on a Caterpillar CX transmission?

Accepted Answer

A)  rheostat variable resistor float 
B)  potentiometer 
C)  optical 
D)  Hall-effect 
A)  rheostat variable resistor float 
B)  potentiometer 
C)  optical 
D)  Hall-effect

Question 20

Which of the following are serial communications interface (SCI)outputs from the WT ECU?

Accepted Answer

A)  cruise control status 
B)  road speed limit status 
C)  kickdown signal 
D)  transmission output speed 
A)  cruise control status 
B)  road speed limit status 
C)  kickdown signal 
D)  transmission output speed

Exam 21: Electronically Controlled Automatic Transmissions Ecats

What effects clutch control in a Caterpillar CX transmission?

Which of the following are advantages of using secondary submodulation of solenoids?

How many forward ratios are there in an Allison TC10?

Which of the following best describes the function of the Allison WT serial communications interface (SCI)?

Technician A says that the WT mainshaft is splined to the rotating clutch module.Technician B says that the mainshaft connects all three planetary gearsets in a WT transmission.Who is correct?

Which of the folowing is a full-authority ECAT?

What lubricant do Caterpillar recommend for use in their CX family of onhighway transmissions?

What is used to manage main pressure in an ECAT?

How many forward ratios are there in a Caterpillar CX35 vocational transmission?

Which of these clutches puts an Allison WT drop-box into extra-low range?

Which of the following true statements is true regarding solenoid operation in an Allison ECATs?

Which of the following should be true of a powershift transmission?

What is indicated when the WT Digital Display is showing a flashing 3?

Which of the following descriptions best describes the older Allison CEC family of electronically-managed transmissions?

Technician A says that when the WT digital display (DD)is blank,the reason could be a problem in the electrical circuit to the shift selector.Technician B says that when the WT DD is blank,the data link may have failed.Who is correct?

Which of the following pressure values would be within specification for main pressure in a Caterpillar CX transmission?

Where is the main pressure tap located on a Caterpillar CX transmission?

Which of the following Allison WT clutches are designed to transmit rotating torque to the planetary gears?

What type of fluid level sensor is used to signal sump level on a Caterpillar CX transmission?

Which of the following are serial communications interface (SCI)outputs from the WT ECU?

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 Transmissions

Automatic Transmission Maintenance

Electronically Automated Standard Transmissions

Driveshaft Assemblies

Heavy-Duty Truck Axles

Heavy-Duty Truck Axle Service and Repair

Steering and Alignment

Suspension Systems

Wheels and Tires

Truck Brake Systems

Hydraulic Brakes and Air-Over-Hydraulic Brake Systems

Abs and Ebs

Air Brake Servicing

Vehicle Chassis Frame

Heavy-Duty Truck Trailers

Fifth Wheels and Coupling Systems

Heavy-Duty Heating, ventilation, and Air Conditioning Systems

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