HEAVY TRUCK BRAKES MICHIGAN
MECHANIC FINAL EXAM STUDY GUIDE
2026 COMPLETE QUESTIONS AND
SOLUTIONS GRADED A+
⩥ 2. While greasing a U-Joint cross, grease exits from only 3 of the four
trunnion seals. what should you do first?
A. Leave it, grease will circulate in the cross.
B. Replace the U-joint assembly.
C. Pound on the bearing cap with a large hammer.
D. Loosen the journal cap over the affected trunnion and try again..
Answer: D. Loosen the journal cap over the affected trunnion and try
again.
⩥ 3. Which of the following trailer chassis systems usually represents
the highest maintenance costs?
A. Doors
B. Suspensions
C. Tires
D. Brakes. Answer: C. Tires
⩥ 4. On which of the following maintenance documents does the driver
have input to?
,A. Schedule A report
B. Schedule B report
C. Technician inspection report
D. Driver inspection report. Answer: D. Driver inspection report
⩥ 5. Which of the following gear lube classifications would be
appropriate for use in the most current truck differential carriers?
A. API GL-4
B. API GL-5
C. API GL-6
D. API GL-7. Answer: B. API GL-5
⩥ 6. Which type of antifreeze mixture should never be diluted with
water?
A. Ethylene-glycol
B. Propylene-glycol
C. Extended Life Coolant
D. It is acceptable to dilute any antifreeze with water. Answer: C.
Extended Life Coolant
⩥ 7. What happens when Ethylene-glycol (EG) is mixed with water at a
ratio exceeding 68:32?
A. Freeze point increases
,B. Freeze point decreases
C. Freeze point does not change
D. It changes to gel. Answer: A. Freeze point increases
⩥ 8. When you test antifreeze with litmus paper, what are you
measuring?
A. Freeze point
B. Nitrate protection level
C. Contamination
D. Acidity. Answer: D. Acidity
⩥ 9. Which of the following lubricants is recommended for cab door
hinges?
A. Chassis grease
B. Engine oil
C. Dry graphite
D. Penetrating oil. Answer: C. Dry graphite
⩥ 10. If you see evidence of welding on a trailer pintle hook while
inspecting a trailer, what should you do?
A. OOS deadline the vehicle
B. Grind the weld profile smooth
C. Test the pintle hook with a hammer
, D. Despatch the vehicle. Answer: A. OOS deadline the vehicle
⩥ 11. Which theory of electrical current flow states that current flows
from a negative location to a positive location in an electrical circuit?
A. Kilowatt law
B. Electron theory
C. Conventional theory
D. Ohm's law. Answer: B. Electron theory
⩥ 12. What type of signal is produced by an Inductive pulse generator?
A. Saw-tooth
B. Square-wave
C. AC Sine Wave
D. Rippled DC. Answer: C. AC Sine Wave
⩥ 13. Vehicle wiring schematics use which theory of current flow almost
exclusively?
A. Conventional theory
B. Electron theory
C. Gilbert theory
D. Faraday theory. Answer: A. Conventional theory
MECHANIC FINAL EXAM STUDY GUIDE
2026 COMPLETE QUESTIONS AND
SOLUTIONS GRADED A+
⩥ 2. While greasing a U-Joint cross, grease exits from only 3 of the four
trunnion seals. what should you do first?
A. Leave it, grease will circulate in the cross.
B. Replace the U-joint assembly.
C. Pound on the bearing cap with a large hammer.
D. Loosen the journal cap over the affected trunnion and try again..
Answer: D. Loosen the journal cap over the affected trunnion and try
again.
⩥ 3. Which of the following trailer chassis systems usually represents
the highest maintenance costs?
A. Doors
B. Suspensions
C. Tires
D. Brakes. Answer: C. Tires
⩥ 4. On which of the following maintenance documents does the driver
have input to?
,A. Schedule A report
B. Schedule B report
C. Technician inspection report
D. Driver inspection report. Answer: D. Driver inspection report
⩥ 5. Which of the following gear lube classifications would be
appropriate for use in the most current truck differential carriers?
A. API GL-4
B. API GL-5
C. API GL-6
D. API GL-7. Answer: B. API GL-5
⩥ 6. Which type of antifreeze mixture should never be diluted with
water?
A. Ethylene-glycol
B. Propylene-glycol
C. Extended Life Coolant
D. It is acceptable to dilute any antifreeze with water. Answer: C.
Extended Life Coolant
⩥ 7. What happens when Ethylene-glycol (EG) is mixed with water at a
ratio exceeding 68:32?
A. Freeze point increases
,B. Freeze point decreases
C. Freeze point does not change
D. It changes to gel. Answer: A. Freeze point increases
⩥ 8. When you test antifreeze with litmus paper, what are you
measuring?
A. Freeze point
B. Nitrate protection level
C. Contamination
D. Acidity. Answer: D. Acidity
⩥ 9. Which of the following lubricants is recommended for cab door
hinges?
A. Chassis grease
B. Engine oil
C. Dry graphite
D. Penetrating oil. Answer: C. Dry graphite
⩥ 10. If you see evidence of welding on a trailer pintle hook while
inspecting a trailer, what should you do?
A. OOS deadline the vehicle
B. Grind the weld profile smooth
C. Test the pintle hook with a hammer
, D. Despatch the vehicle. Answer: A. OOS deadline the vehicle
⩥ 11. Which theory of electrical current flow states that current flows
from a negative location to a positive location in an electrical circuit?
A. Kilowatt law
B. Electron theory
C. Conventional theory
D. Ohm's law. Answer: B. Electron theory
⩥ 12. What type of signal is produced by an Inductive pulse generator?
A. Saw-tooth
B. Square-wave
C. AC Sine Wave
D. Rippled DC. Answer: C. AC Sine Wave
⩥ 13. Vehicle wiring schematics use which theory of current flow almost
exclusively?
A. Conventional theory
B. Electron theory
C. Gilbert theory
D. Faraday theory. Answer: A. Conventional theory
