310T Practical Skills and Training 2

Question 1

When performing a brake chamber stroke check on a service brake, the pushrod stroke must not exceed which limit to pass inspection?

Accepted Answer

The readjustment limit specified by FMCSA

Answer

The maximum stroke marked on the chamber

Answer

50% of the chamber's rated stroke

Answer

2 inches regardless of chamber size

Question 2

A technician notices the air dryer purge valve is leaking continuously. The MOST likely cause is:

Accepted Answer

Failed purge valve solenoid or seat

Answer

Contaminated desiccant cartridge

Answer

Low compressor output pressure

Answer

Cracked air dryer housing

Question 3

When adjusting automatic slack adjusters on S-cam brakes, if adjustment continues to back off after the wheels turn, what is indicated?

Accepted Answer

The S-cam bushings are worn

Answer

The adjuster is functioning correctly

Answer

The slack adjuster needs replacement

Answer

The brake shoes are worn beyond limit

Question 4

What is the correct procedure when bleeding air from hydraulic brake lines on a coach equipped with a hydroboost system?

Accepted Answer

Bleed with engine running to maintain hydraulic pressure

Answer

Bleed with engine off and hydraulic system depressurized

Answer

Use a vacuum bleeder only; pressure bleeders are prohibited

Answer

Gravity bleed from the master cylinder only

Question 5

During a pre-trip inspection, a driver reports the low air warning buzzer activates before the vehicle reaches operating pressure. Which component should be checked FIRST?

Accepted Answer

Low pressure warning switch calibration

Answer

Air compressor output

Answer

Governor cut-in and cut-out settings

Answer

Reservoir tank drain valves

Question 6

A coach air conditioning system shows adequate refrigerant charge but delivers poor cooling. The technician finds the condenser coil heavily clogged. What is the DIRECT result of this condition?

Accepted Answer

High head pressure and reduced refrigerant subcooling

Answer

Low suction pressure and high discharge pressure

Answer

High suction pressure and low discharge pressure

Answer

Low head pressure and excessive superheat

Question 7

When torquing steer axle wheel nuts in a two-piece flange nut design, the correct final step is:

Accepted Answer

Torque inner nut, install outer nut, torque outer nut to spec

Answer

Torque to spec, then back off 1/4 turn

Answer

Torque to spec and install cotter pin without further adjustment

Answer

Torque to spec, rotate wheel, re-torque if below minimum