Question 1

What is the torque required for wheel installation in a ConMet unitized hub system?

Accepted Answer

A)  none used 
B)  150 lb-ft (203 N.m) 
C)  300 lb-ft (407 N.m) 
D)  450 lb-ft (610 N.m) 
A)  none used 
B)  150 lb-ft (203 N.m) 
C)  300 lb-ft (407 N.m) 
D)  450 lb-ft (610 N.m) C

Question 2

Technician A says that in a cast spoke wheel,the wheel hub is integral with wheel.Technician B says that in disc wheels,the wheel hub and wheel are a single unit.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 A

Question 3

Which of the following are advantages of hub-piloted truck disc wheels when compared with cast spoke wheels?

Accepted Answer

A)  fewer alignment problems 
B)  lighter weight 
C)  extended tire life 
D)  all of the above 
A)  fewer alignment problems 
B)  lighter weight 
C)  extended tire life 
D)  all of the above D

Question 4

Which of the following statements about truck wheel ends is true?

Accepted Answer

A)  a tire is mounted to a rim,and the rim is mounted to a wheel 
B)  a tire is mounted to a wheel,which is supported by the rim 
C)  a wheel is mounted to a rim,and the brakes are mounted to a spindle 
D)  a wheel is mounted to a spider,and the brakes are mounted to a rim 
A)  a tire is mounted to a rim,and the rim is mounted to a wheel 
B)  a tire is mounted to a wheel,which is supported by the rim 
C)  a wheel is mounted to a rim,and the brakes are mounted to a spindle 
D)  a wheel is mounted to a spider,and the brakes are mounted to a rim

Question 5

Technician A says that modern tires are engineered to be retreaded just once during their service life.Technician B says that the cost of retreading a typical truck tire is approximately 50% of the cost of a new tire.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

Technician A says that you cannot mix bias ply and radial tires on a steering axle.Technician B says that it is OK to mix bias ply and radial on a truck drive axle providing you do not mismatch the dual pairs.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 7

When a tire is over-inflated,where is accelerated wear going to take place?

Accepted Answer

A)  center of treads 
B)  side of treads 
C)  sidewall 
D)  bead 
A)  center of treads 
B)  side of treads 
C)  sidewall 
D)  bead

Question 8

Technician A says that the wheel bearing on a unitized hub system should not require adjustment during the life of the hub.Technician B says that periodic topping up of oil in wheel hubs is eliminated in some types of unitized axle.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 9

Technician A says that disc wheels nuts and studs on the left side of a truck often use a right hand thread.Technician B says that disc wheels often use fasteners that unscrew in the reverse of their direction of forward rotation.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 10

Which of the following is a major advantage of a cast spoke wheel when compared with a stud-piloted disc wheel?

Accepted Answer

A)  lighter weight 
B)  fewer wheel-off incidents 
C)  fewer runout problems 
D)  all of the above 
A)  lighter weight 
B)  fewer wheel-off incidents 
C)  fewer runout problems 
D)  all of the above

Question 11

Technician A says that to deflate a truck tire,the Schrader valve plunger should be depressed until all of the air pressure is relieved.Technician B says that a Shrader valve is the only common component in vehicles ranging from a bicycle through automobiles and highway trucks.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 12

According to Federal Motor Carrier safety regulations,at what thread depth should front axle steering tires be replaced?

Accepted Answer

A)  2/32" (1.5 mm) 
B)  3/32" (2 mm) 
C)  4/32" (3 mm) 
D)  when the wear indicators show 
A)  2/32" (1.5 mm) 
B)  3/32" (2 mm) 
C)  4/32" (3 mm) 
D)  when the wear indicators show

Question 13

Which of the following tire sizes would you expect to find on a Class 8 highway truck?

Accepted Answer

A)  18- or 20-inch (45 or 50 cm) 
B)  22.5- or 24.5-inch (57 or 62 cm) 
C)  23- or 25-inch (58 or 64 cm) 
D)  26.5- or 28.5-inch (67 or 72 cm) 
A)  18- or 20-inch (45 or 50 cm) 
B)  22.5- or 24.5-inch (57 or 62 cm) 
C)  23- or 25-inch (58 or 64 cm) 
D)  26.5- or 28.5-inch (67 or 72 cm)

Question 14

When torquing the rim lug (clamp)nuts on a truck cast spoke wheel,which of the following should be true about the method,torque sequence,and position you torque each nut?

Accepted Answer

A)  wheel down,circular torque sequence,torque each nut at 12 o'clock 
B)  wheel down,criss-cross torque sequence,torque each nut at 6 o'clock 
C)  wheel up,criss-cross torque sequence,torque each nut at 12 o'clock 
D)  wheel up,circular torque sequence,torque each nut at 6 o'clock 
A)  wheel down,circular torque sequence,torque each nut at 12 o'clock 
B)  wheel down,criss-cross torque sequence,torque each nut at 6 o'clock 
C)  wheel up,criss-cross torque sequence,torque each nut at 12 o'clock 
D)  wheel up,circular torque sequence,torque each nut at 6 o'clock

Question 15

A tire used on a truck rear axle has premature wear at both wall sides of the treads.What is the most likely cause?

Accepted Answer

A)  overinflation 
B)  underinflation 
C)  excess toe 
D)  excess caster 
A)  overinflation 
B)  underinflation 
C)  excess toe 
D)  excess caster

Question 16

Which of the following methods should be used to check wheel runout on a mounted tire?

Accepted Answer

A)  dial indicator 
B)  wood block and chalk 
C)  brake drum micrometer 
D)  computerized alignment deck 
A)  dial indicator 
B)  wood block and chalk 
C)  brake drum micrometer 
D)  computerized alignment deck

Question 17

Technician A says that radial tires deflect less than bias ply tires when operating under load and at highway speeds.Technician B says that radial tires have a constantly changing footprint in operation.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 18

Technician A says that tire pressures should always be checked when the tires are at operating temperature.Technician B says that the pressure rise that takes place from a cold tire to one at operating temperature is usually around 10% in a truck tire.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 19

What is the maximum permitted runout for a truck cast spoke wheel after adjustment?

Accepted Answer

A)  1/16" (1.5 mm) 
B)  1/8" (3 mm) 
C)  3/16" (4.5 mm) 
D)  1/4" (6 mm) 
A)  1/16" (1.5 mm) 
B)  1/8" (3 mm) 
C)  3/16" (4.5 mm) 
D)  1/4" (6 mm)

Question 20

Which of the following safety precautions should be adhered to when inflating truck tires?

Accepted Answer

A)  inflate tires in a safety cage 
B)  use a clip-on chuck with a remote in-line valve 
C)  stay out of the trajectory of any parts that could separate 
D)  all of the above 
A)  inflate tires in a safety cage 
B)  use a clip-on chuck with a remote in-line valve 
C)  stay out of the trajectory of any parts that could separate 
D)  all of the above

Exam 27: Wheels and Tires

What is the torque required for wheel installation in a ConMet unitized hub system?

Technician A says that in a cast spoke wheel,the wheel hub is integral with wheel.Technician B says that in disc wheels,the wheel hub and wheel are a single unit.Who is correct?

Which of the following are advantages of hub-piloted truck disc wheels when compared with cast spoke wheels?

Which of the following statements about truck wheel ends is true?

Technician A says that modern tires are engineered to be retreaded just once during their service life.Technician B says that the cost of retreading a typical truck tire is approximately 50% of the cost of a new tire.Who is correct?

Technician A says that you cannot mix bias ply and radial tires on a steering axle.Technician B says that it is OK to mix bias ply and radial on a truck drive axle providing you do not mismatch the dual pairs.Who is correct?

When a tire is over-inflated,where is accelerated wear going to take place?

Technician A says that the wheel bearing on a unitized hub system should not require adjustment during the life of the hub.Technician B says that periodic topping up of oil in wheel hubs is eliminated in some types of unitized axle.Who is correct?

Technician A says that disc wheels nuts and studs on the left side of a truck often use a right hand thread.Technician B says that disc wheels often use fasteners that unscrew in the reverse of their direction of forward rotation.Who is correct?

Which of the following is a major advantage of a cast spoke wheel when compared with a stud-piloted disc wheel?

Technician A says that to deflate a truck tire,the Schrader valve plunger should be depressed until all of the air pressure is relieved.Technician B says that a Shrader valve is the only common component in vehicles ranging from a bicycle through automobiles and highway trucks.Who is correct?

According to Federal Motor Carrier safety regulations,at what thread depth should front axle steering tires be replaced?

Which of the following tire sizes would you expect to find on a Class 8 highway truck?

When torquing the rim lug (clamp)nuts on a truck cast spoke wheel,which of the following should be true about the method,torque sequence,and position you torque each nut?

A tire used on a truck rear axle has premature wear at both wall sides of the treads.What is the most likely cause?

Which of the following methods should be used to check wheel runout on a mounted tire?

Technician A says that radial tires deflect less than bias ply tires when operating under load and at highway speeds.Technician B says that radial tires have a constantly changing footprint in operation.Who is correct?

Technician A says that tire pressures should always be checked when the tires are at operating temperature.Technician B says that the pressure rise that takes place from a cold tire to one at operating temperature is usually around 10% in a truck tire.Who is correct?

What is the maximum permitted runout for a truck cast spoke wheel after adjustment?

Which of the following safety precautions should be adhered to when inflating truck tires?

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

Electronically Controlled Automatic Transmissions Ecats

Driveshaft Assemblies

Heavy-Duty Truck Axles

Heavy-Duty Truck Axle Service and Repair

Steering and Alignment

Suspension Systems

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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