Heavy Duty Truck Systems – Final Exam Part A – Practice Questions & Revision Material

Heavy Duty Truck Systems – Final Exam Part A – Practice Questions & Revision
Material


1. What is the maximum allowable stroke for a type 30, clamp type brake chamber?

A. 2"

B. 1 3/4"

C. 2 1/2"

D. 8 3/32" - correct answer ✔✔A. 2"



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. - correct 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 - correct 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 - correct 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 - correct 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 - correct 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 - correct 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 - correct 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 - correct 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 - correct 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 - correct 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 - correct 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 - correct answer ✔✔A. Conventional theory



14. Which of these terms mean the same thing as Voltage?

A. Charge differential

B. Electromotive force

C. Potential difference

D. All of the above - correct answer ✔✔d. All of the above



15. Which of the following devices does NOT rely upon the principles of electromagnetism to
function?

A.Solenoid

B. Headlight.

C.Relay

D.Ignition coil - correct answer ✔✔B. Headlight.



16. Which of the following circuits has only one path for current to flow?

A. Parallel

B. Series

C. Series-parallel

D. None of the above - correct answer ✔✔B. Series