310T Evaluation and Testing Process 2

Question 1

During a road test evaluation of a Class 8 truck, the technician notices the vehicle pulls to the right when braking. What is the MOST likely cause?

Accepted Answer

A seized or dragging brake on the left front axle

Answer

A dragging or seized brake on the opposite side of the pull causes unequal braking force, pulling the vehicle toward the stuck brake.

Question 2

A coach technician is performing a pre-inspection before road testing a bus with a reported rough idle. What should be done FIRST?

Accepted Answer

Connect a scan tool to retrieve active fault codes

Answer

Retrieving active fault codes first gives direction and prevents overlooking stored diagnostic information before starting other tests.

Question 3

When using an oscilloscope to evaluate a crankshaft position sensor signal on a diesel engine, a good waveform should show:

Accepted Answer

A sine or digital pattern with a missing tooth gap at TDC reference

Answer

The crankshaft position sensor produces a pattern with a deliberate missing tooth gap that the ECM uses as a TDC reference point.

Question 4

A technician is evaluating a hydraulic power steering system on a truck. Steering effort is high at low speeds but normal at highway speeds. The MOST likely cause is:

Accepted Answer

A clogged power steering filter or low fluid level

Answer

A clogged filter or low fluid restricts flow and pressure, reducing assist most noticeably at low speeds when demand is highest.

Question 5

During evaluation of a truck's air brake system, the governor cut-in pressure is found to be 95 psi and cut-out is 130 psi. This indicates:

Accepted Answer

A governor with an excessively wide pressure band that should be replaced

Answer

FMCSA regulations require the pressure differential between cut-in and cut-out to not exceed 25 psi; a 35 psi spread indicates a faulty governor.

(310t) Truck and Coach Technician Certification Practice Test

(310t) Truck and Coach Technician Certification Practice Test

310T Evaluation and Testing Process 2