Air Brake Test Air Pressure Regulation & Control 2

Question 1

What is the typical 'cut-out' pressure for an air brake compressor governor?

Accepted Answer

125 psi

Answer

60 psi

Answer

90 psi

Answer

150 psi

Question 2

What happens when air pressure drops below the governor 'cut-in' pressure?

Accepted Answer

The compressor begins pumping air back into the system

Answer

The spring brakes automatically apply

Answer

The low air pressure warning activates immediately

Answer

The foot brake becomes inoperable

Question 3

What is the purpose of the safety relief valve in an air brake system?

Accepted Answer

To release excess air if the governor fails and pressure becomes dangerously high

Answer

To drain moisture from the air tanks

Answer

To maintain constant pressure in the brake lines

Answer

To regulate air flow to individual wheel cylinders

Question 4

Which component in the air brake system separates oil and moisture from the compressed air before it enters the tanks?

Accepted Answer

The air dryer

Answer

The governor

Answer

The one-way check valve

Answer

The quick release valve

Question 5

What does it indicate if the air pressure does not rise from 50 to 90 psi within 3 minutes at engine idle?

Accepted Answer

There is a problem with the air compressor or a significant air leak in the system

Answer

The governor needs adjustment

Answer

The air tanks are full and do not need to charge

Answer

Normal operation for cold weather conditions

Question 6

What is the function of the one-way check valve located between the wet and dry tanks?

Accepted Answer

It prevents air from flowing back from the dry tank to the wet tank if pressure drops

Answer

It drains oil from the wet tank automatically

Answer

It balances pressure between the primary and secondary circuits

Answer

It opens to release air when the driver applies the parking brake