310T Preventive Maintenance and Inspection 3

Question 1

What is the correct procedure for disposing of used engine oil after completing a PM service?

Accepted Answer

Store it in an approved container and deliver it to a certified recycling facility

Answer

Pour it into a floor drain connected to a separator

Answer

Mix it with diesel fuel and burn it in the engine

Answer

Dispose of it in an approved solid waste landfill

Question 2

How is engine coolant freeze protection most accurately tested during preventive maintenance?

Accepted Answer

With a refractometer or hydrometer to measure specific gravity or freeze point

Answer

By checking coolant color against a chart

Answer

By smelling the coolant for glycol odor

Answer

By observing the coolant level in the sight glass

Question 3

Under FMCSA regulations, what defines an 'out-of-service' condition for a commercial motor vehicle?

Accepted Answer

A defect so severe that continued operation poses an imminent hazard to safety

Answer

Any defect identified during a roadside inspection

Answer

A vehicle carrying more than half its rated payload

Answer

A vehicle that has exceeded its PM interval by 500 miles

Question 4

What is checked during a slack adjuster inspection on an S-cam drum brake system?

Accepted Answer

Adjustment arm travel distance and proper manual or automatic adjustment function

Answer

Brake pedal travel height

Answer

Brake fluid reservoir level

Answer

Air compressor output pressure

Question 5

When performing PM on a truck's diesel particulate filter (DPF), what maintenance task is periodically required beyond normal passive regeneration?

Accepted Answer

Forced active regeneration or physical ash cleaning of the DPF

Answer

Replacing the EGR valve cooler

Answer

Cleaning or replacing fuel injectors

Answer

Replacing the engine air filter element

Question 6

What is the correct source for wheel-end fastener torque values when reinstalling hubs or wheels during PM?

Accepted Answer

The vehicle or axle manufacturer's torque specification

Answer

General industry torque reference charts

Answer

The technician's experience with similar vehicles

Answer

The lug nut manufacturer's packaging label

Question 7

Which condition found during a battery inspection indicates the battery must be replaced?

Accepted Answer

Case swelling, a cracked housing, or capacity below 80% on a load test

Answer

Light surface grime on the battery case

Answer

A resting open-circuit voltage of 12.4 volts

Answer

Minor terminal corrosion that can be cleaned with baking soda solution