310T Cheat Sheet 2026

The 30 highest-yield 310T facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is a core component of practical training for technicians? → Preventive maintenance techniques
2. What document is essential to prove eligibility for certification? → Proof of apprenticeship completion
3. When renewing a 310T credential in a province that requires renewal, which of the following is most commonly required? → Completing approved continuing education credits
4. When recovering refrigerant from a 310T-compliant truck A/C system, the technician must: → Use EPA-certified recovery equipment and store refrigerant in approved containers
5. What type of valve modulates air pressure to each wheel independently during ABS activation? → Modulator valve (ABS solenoid valve)
6. What does the 'torque multiplication ratio' of a torque converter represent? → The ratio of output torque to input torque at stall condition
7. When mounting dual tires on a truck rear axle, what is the MOST important matching requirement between the two tires on the same axle end? → Both tires must have matching overall circumference (rolling radius)
8. During a brake application, the left front wheel locks up while the right front remains normal. This symptom MOST likely indicates: → A stuck open ABS modulator valve on the left front
9. On a combination vehicle, which valve automatically closes to protect the tractor air supply if trailer air pressure drops rapidly? → Tractor protection valve
10. Which condition found during a battery inspection indicates the battery must be replaced? → Case swelling, a cracked housing, or capacity below 80% on a load test
11. A truck technician interested in government employment should explore opportunities with which type of agency? → State and municipal transit authorities, school districts, and military vehicle depots
12. A truck cab blower motor runs only on high speed. Which component is most likely faulty? → Blower motor resistor or speed control module
13. Which components are inspected to confirm the air dryer is functioning correctly during PM? → Purge valve operation and desiccant cartridge condition
14. A truck's air dryer purge valve is constantly exhausting air. What is the MOST likely cause? → Excessive compressor oil carry-over clogging the desiccant
15. During evaluation of a coach's door system, pneumatically operated doors open slowly but close at normal speed. The MOST likely cause is: → A restricted or maladjusted opening-direction flow control valve
16. A coach technician is replacing fuel filters on a common rail diesel. After installation, the correct bleeding procedure is to: → Use a hand primer pump to fill the filters before cranking
17. How is engine coolant freeze protection most accurately tested during preventive maintenance? → With a refractometer or hydrometer to measure specific gravity or freeze point
18. The parking brake dash control valve pops out (applies) immediately after it is pushed in. What is the MOST likely cause? → System reservoir pressure is below hold-in threshold
19. When evaluating exhaust back pressure on a diesel engine, a reading of 3.5 inches Hg at rated RPM indicates: → Normal back pressure within acceptable limits
20. What does it indicate when a brake chamber push rod stroke exceeds the maximum allowable limit? → The brakes are under-adjusted or excessively worn, reducing braking effectiveness
21. A truck's cab heater produces warm air only at idle but blows cool air at highway speeds. What is the most likely cause? → Low coolant level causing air pockets at higher RPM
22. What happens to the spring brakes when the parking brake control valve is pushed IN on a truck? → Spring brakes release
23. In a tandem drive axle arrangement, the purpose of the inter-axle differential (power divider) is to: → Distribute torque equally between the front and rear drive axles
24. A Class 8 truck repeatedly trips the low air pressure warning at 60 psi within minutes of starting the engine. What should be checked FIRST? → Compressor belt tension and condition
25. A vehicle equipped with an automatic transmission exhibits abnormal noise only in Park and Neutral but not in Drive or Reverse. The MOST likely cause is: → Worn or damaged torque converter pilot hub or front pump bushing
26. Which test is used to verify the compressor governor cut-in and cut-out pressures? → Governor pressure test using a calibrated gauge at the wet tank
27. An Allison automatic transmission control module (TCM) stores a code for 'transmission range inhibit.' What does this indicate? → The gear selector position sensor disagrees with the actual range selected
28. A technician hears air leaking from the exhaust port of the brake application valve when brakes are fully released. This indicates: → A leaking primary or secondary inlet valve seat
29. What is the correct source for wheel-end fastener torque values when reinstalling hubs or wheels during PM? → The vehicle or axle manufacturer's torque specification
30. Which of the following symptoms is most commonly associated with a clogged fuel filter in a heavy-duty truck? → Loss of power, especially during acceleration or when climbing grades