Question 1

Which of the following best describes how differential action takes place during cornering?

Accepted Answer

A)   outside wheel rotates faster than the inside wheel
B)   outside wheel rotates slower than the inside wheel
C)   inside wheel is accelerated to the speed of the outside wheel
D)   outside wheel is braked to the speed of the inside wheelE) B) and C)
F) B) and D)

Question 2

Which ONE of the following statements is TRUE?

Accepted Answer

A)   all two-speed axles use double-reduction
B)   double-reduction axles are always two-speed axles
C)   all tandem drive axles are double-reduction
D)   single-reduction axles are seldom used in trucksE) A) and B)
F) A) and C)

Question 3

When the differential lock of a single-reduction axle is engaged,which of the following components must rotate at the same speed?

Accepted Answer

A)   differential case and both axle shafts
B)   both axle shafts and the drive pinion
C)   drive pinion and crown gear
D)   drive pinion and both axle shaftsE) A) and D)
F) None of the above

Question 4

Where would a tag axle usually be located on a highway truck?

Accepted Answer

A)   in front of the steering axle
B)   immediately behind a steering axle
C)   in front of a rear drive axle
D)   immediately behind a rear drive axleE) None of the above
F) C) and D)

Question 5

Which of the following is an advantage of an air-lift axle?

Accepted Answer

A)   increases load carrying ability of the truck
B)   can be raised to avoid tire scuffing in turns
C)   can be proportioned to balance weight distribution through the chassis
D)   all of the aboveE) A) and B)
F) C) and D)

Question 6

When a differential carrier is described as single reduction,where does the gear reduction actually take place?

Accepted Answer

A)   differential gearing
B)   planetary carrier
C)   propeller shaft and pinion
D)   pinion and crown gearsetE) A) and B)
F) B) and C)

Question 7

Which part of a truck differential carrier assembly contains a spider and four pinions?

Accepted Answer

A)   differential
B)   crown gear
C)   pinion
D)   ring gearE) C) and D)
F) All of the above

Question 8

In a typical interaxle differential,what do the differential pinions rotate on?

Accepted Answer

A)   spider
B)   crown gear
C)   axle shafts
D)   propeller shaftE) B) and C)
F) A) and D)

Question 9

When a differential carrier is equipped with a lube pump,where is pressurized lubricant delivered to?

Accepted Answer

A)   interaxle differential and front bearings
B)   ring and pinion gearset
C)   all of the gears and bearings in the axle
D)   drilled passages to the planetary gearsE) B) and D)
F) B) and C)

Question 10

Which of the following describes amboid gearing?

Accepted Answer

A)   axis of the drive pinion is above the centerline of the ring gear
B)   axis of the drive pinion is below the centerline of the ring gear
C)   drive pinion meshes the ring gear at its centerline
D)   none of the aboveE) A) and C)
F) A) and B) A

Question 11

What component is used to connect the steering knuckles on a steer axle so they move together when turning effort is applied?

Accepted Answer

A)   steering control arm
B)   Pitman arm
C)   tie rod
D)   drag linkE) B) and C)
F) All of the above

Question 12

Which of the following truck drive axle configurations uses two gearsets to provide both an additional gear reduction and greater torque at the drive wheels?

Accepted Answer

A)   single-reduction axle
B)   tandem drive axles
C)   power divider
D)   double-reduction axleE) A) and D)
F) A) and C)

Question 13

Where would a pusher axle usually be located on a highway truck?

Accepted Answer

A)   in front of the steering axle
B)   immediately behind a steering axle
C)   in front of a rear drive axle
D)   immediately behind a rear drive axleE) A) and B)
F) B) and D)

Question 14

Technician A says that when a full-floating axle shaft is used,the axle shaft supports the weight of the truck on the wheel end.Technician B says that full-floating axle shafts can be removed from a truck without removing the wheel.Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor BE) A) and B)
F) All of the above B

Question 15

What components are directly responsible for changing the direction of powerflow by 90 degrees in a drive axle carrier?

Accepted Answer

A)   differential gearing
B)   crown and pinion
C)   planetary reduction gearing
D)   axle shafts and side gearsE) All of the above
F) A) and D)

Question 16

What is the final drive component of a truck drive axle usually known as?

Accepted Answer

A)   rear transaxle
B)   differential carrier
C)   dead axle
D)   power dividerE) None of the above
F) A) and B)

Question 17

When a drive wheel spinout occurs,why is the interaxle differential more susceptible to damage than the differential carriers?

Accepted Answer

A)   turns at a higher speed
B)   no differential action occurs in either of the differential carriers
C)   it does not rotate
D)   differential carriers turn at a higher speedE) A) and D)
F) All of the above

Question 18

Technician A says that some trailers use hollow box-section beam axles.Technician B says that some trailers use hollow round-section beam axles.Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor BE) All of the above
F) A) and D)

Question 19

Technician A says that hypoid gears drive forward on the convex side of the crown gear teeth.Technician B says that hypoid gearsets require EP rated mineral base lubes only and synthetics are not yet approved.Who is correct?

Accepted Answer

A)   Technician A only
B)   Technician B only
C)   Both A and B
D)   Neither A nor BE) None of the above
F) B) and D) A

Question 20

Technician A says that lift and tag axles can both be classified as dead axles.Technician B says that all steering axles are dead axles.Who is correct?

Accepted Answer

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

Exam 23: Heavy-Duty Truck Axles

Which of the following best describes how differential action takes place during cornering?

Correct AnswerverifiedShow Answer

Which ONE of the following statements is TRUE?

Correct AnswerverifiedShow Answer

When the differential lock of a single-reduction axle is engaged,which of the following components must rotate at the same speed?

Correct AnswerverifiedShow Answer

Where would a tag axle usually be located on a highway truck?

Correct AnswerverifiedShow Answer

Which of the following is an advantage of an air-lift axle?

Correct AnswerverifiedShow Answer

When a differential carrier is described as single reduction,where does the gear reduction actually take place?

Correct AnswerverifiedShow Answer

Which part of a truck differential carrier assembly contains a spider and four pinions?

Correct AnswerverifiedShow Answer

In a typical interaxle differential,what do the differential pinions rotate on?

Correct AnswerverifiedShow Answer

When a differential carrier is equipped with a lube pump,where is pressurized lubricant delivered to?

Correct AnswerverifiedShow Answer

Which of the following describes amboid gearing?

Correct AnswerverifiedA

What component is used to connect the steering knuckles on a steer axle so they move together when turning effort is applied?

Correct AnswerverifiedShow Answer

Which of the following truck drive axle configurations uses two gearsets to provide both an additional gear reduction and greater torque at the drive wheels?

Correct AnswerverifiedShow Answer

Where would a pusher axle usually be located on a highway truck?

Correct AnswerverifiedShow Answer

Technician A says that when a full-floating axle shaft is used,the axle shaft supports the weight of the truck on the wheel end.Technician B says that full-floating axle shafts can be removed from a truck without removing the wheel.Who is correct?

Correct AnswerverifiedB

What components are directly responsible for changing the direction of powerflow by 90 degrees in a drive axle carrier?

Correct AnswerverifiedShow Answer

What is the final drive component of a truck drive axle usually known as?

Correct AnswerverifiedShow Answer

When a drive wheel spinout occurs,why is the interaxle differential more susceptible to damage than the differential carriers?

Correct AnswerverifiedShow Answer

Technician A says that some trailers use hollow box-section beam axles.Technician B says that some trailers use hollow round-section beam axles.Who is correct?

Correct AnswerverifiedShow Answer

Technician A says that hypoid gears drive forward on the convex side of the crown gear teeth.Technician B says that hypoid gearsets require EP rated mineral base lubes only and synthetics are not yet approved.Who is correct?

Correct AnswerverifiedA

Technician A says that lift and tag axles can both be classified as dead axles.Technician B says that all steering axles are dead axles.Who is correct?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified