310T Practical Skills and Training 5

Question 1

During a DOT annual vehicle inspection, a technician finds a cracked windshield with a star break of 3/4 inch in the driver's critical viewing area. This vehicle should be:

Accepted Answer

Failed and placed out of service until repaired

Answer

Passed with a notation for repair within 30 days

Answer

Passed because the break is under 1 inch

Answer

Passed if the driver can see around the crack

Question 2

When performing a cooling system pressure test on a heavy-duty diesel engine, the system should be pressurized to:

Accepted Answer

The pressure rating stamped on the radiator cap

Answer

20 psi above the radiator cap rating

Answer

10 psi below system operating pressure

Answer

50 psi regardless of cap rating

Question 3

A coach technician is replacing fuel filters on a common rail diesel. After installation, the correct bleeding procedure is to:

Accepted Answer

Use a hand primer pump to fill the filters before cranking

Answer

Crank the engine for 30 seconds without starting to prime the system

Answer

Start the engine immediately and allow the high-pressure pump to self-prime

Answer

Apply shop air at 30 psi to the fuel tank vent to push fuel forward

Question 4

When using a chassis dynamometer to verify a road-speed-governor setting on a coach, the technician must ensure:

Accepted Answer

Only the rear drive axle is on rollers and the parking brake is released

Answer

All drive axles are on the rollers and AWD mode is disabled

Answer

The vehicle is tested with a 50% fuel load for accurate reading

Answer

The transmission is in second gear to limit roller speed

Question 5

A technician is torquing cylinder head bolts on a diesel engine that specifies angle torque. After reaching the initial torque value, the angle torque step requires:

Accepted Answer

Rotating each bolt a specified number of degrees using an angle meter or template

Answer

Applying additional torque using a torque wrench set to the angle equivalent

Answer

Loosening each bolt 90 degrees and re-torquing to initial spec

Answer

Applying final torque in the reverse order from the initial sequence

Question 6

When inspecting a coach for proper emergency exit door operation, federal standards require that each emergency door:

Accepted Answer

Opens from both inside and outside without special tools or knowledge

Answer

Opens from the inside only using a key-actuated mechanism

Answer

Can be locked from the inside during transit for passenger security

Answer

Requires 80 lbs of force to open from either side

Question 7

During a scheduled PM, a technician measures fan hub bearing play and finds axial movement of 0.025 inch. The correct action is to:

Accepted Answer

Replace the fan hub assembly

Answer

Note it in the inspection report and recheck at next PM

Answer

Adjust the bearing preload to eliminate the play

Answer

Lubricate the bearing and re-measure after 10 minutes