ELDT - Entry Level Driver Training Vehicle Systems and Malfunctions Questions and Answers

Question 1

What is the primary function of the air compressor governor in a vehicle's air brake system?

Accepted Answer

To control the cut-in and cut-out pressures of the air compressor.

Answer

The air compressor governor's specific job is to monitor the air pressure in the reservoirs and signal the compressor when to start pumping air (cut-in) and when to stop (cut-out) to maintain pressure within the correct operating range.

Question 2

A driver is operating on a long, steep downgrade and notices they must press harder on the brake pedal to achieve the same stopping force. The pedal feels firm, but the truck is not slowing as it should. What is this dangerous condition called?

Accepted Answer

Brake fade

Answer

This scenario describes brake fade, which is a significant loss of stopping power that occurs when excessive heat from prolonged or hard braking reduces the friction between the brake shoes and drums.

Question 3

Which of the following is a common symptom of a failing water pump in the engine's cooling system?

Accepted Answer

A grinding or whining noise from the front of the engine that changes with RPMs.

Answer

A failing water pump often has a worn bearing, which can produce a distinct grinding, whining, or squealing noise from the front of the engine that typically increases in pitch or volume as the engine speed increases.

Question 4

While driving at night, a CMV driver notices the headlights are dimming and flickering, and the needle on the voltmeter is steadily dropping. These are primary indicators of a malfunction in which vehicle system?

Accepted Answer

The electrical system.

Answer

Dimming or flickering lights and a dropping voltmeter/ammeter are classic signs of a failing alternator, which is the component responsible for generating electricity and recharging the battery while the engine is running.

Question 5

During a pre-trip inspection, a driver notices it is very difficult to shift into gear and hears a grinding noise, even with the clutch pedal fully depressed. This most likely indicates a problem with the:

Accepted Answer

Clutch

Answer

Difficulty shifting and grinding noises are classic symptoms of a clutch that is failing to disengage properly. This prevents a clean separation of the engine from the transmission, making gear changes difficult and noisy.

Entry Level Driver Training (ELDT) Practice Test

Entry Level Driver Training (ELDT) Practice Test

ELDT - Entry Level Driver Training Vehicle Systems and Malfunctions Questions and Answers