310T Preventive Maintenance and Inspection

Question 1

What is the minimum tread depth required on front (steer axle) tires of a commercial vehicle per FMCSA regulations?

Accepted Answer

4/32 inch

Answer

2/32 inch

Answer

6/32 inch

Answer

8/32 inch

Question 2

Which fluids should be inspected as standard practice during a preventive maintenance service on a heavy-duty truck?

Accepted Answer

Engine oil, coolant, transmission fluid, power steering fluid, and brake fluid

Answer

Engine oil and fuel only

Answer

Engine oil and coolant only

Answer

Only fluids that are visibly low

Question 3

What is the primary function of an air filter restriction indicator on a diesel engine?

Accepted Answer

To warn when air filter restriction has reached its service limit

Answer

To measure fuel rail pressure

Answer

To detect exhaust backpressure leaks

Answer

To monitor turbocharger speed

Question 4

Under FMCSA 49 CFR Part 396.17, how often must a commercial motor vehicle undergo a periodic inspection?

Accepted Answer

At least once every 12 months

Answer

Every 6 months

Answer

Every 90 days

Answer

Every 2 years

Question 5

What does a PM-A service interval typically include on a heavy-duty commercial truck?

Accepted Answer

Oil and oil filter change plus a basic visual inspection

Answer

Engine overhaul and fuel injector cleaning

Answer

Full transmission rebuild

Answer

Coolant flush and tire replacement

Question 6

What is the correct procedure for verifying a fifth wheel is properly coupled during a pre-trip inspection?

Accepted Answer

Attempt to pull forward against the locked kingpin (tug test) to confirm the latch is secure

Answer

Visually inspect the locking jaws from the cab only

Answer

Apply trailer service brakes and listen for air leaks

Answer

Measure the kingpin diameter with calipers

Question 7

When should wheel bearing adjustment be verified during preventive maintenance?

Accepted Answer

Per the manufacturer's PM schedule and whenever wheel-end components are disassembled

Answer

Only after a tire blowout occurs

Answer

Only when an unusual noise is heard from the wheel end

Answer

Only during a brake re-lining job