Air Brake Supply Circuit

What is the primary component of the air supply circuit in an air brake system?

• Air compressor

• Governor

• Air dryer

• Supply reservoir

What powers the air compressor in an air brake system?

• The vehicle's electrical system

• The vehicle's engine

• An external power source

• The vehicle's hydraulic system

What is the purpose of the governor in an air brake system?

• To store compressed air

• To compress air

• To dry the air

• To regulate air pressure in the supply reservoir

At what pressure does the governor typically cut out, stopping the compressor?

• 120 psi

• 90 psi

• 150 psi

• 100 psi

What is the function of the air dryer in an air brake system?

• To cool the air

• To remove contaminants and water vapor from the air

• To store compressed air

• To compress air

What happens when the supply reservoir pressure drops to the cut-in pressure of the governor?

• The compressor stops compressing air

• The air dryer starts the purge cycle

• The compressor resumes compressing air

• The safety valve opens

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

• To control the compressor

• To prevent over-pressurization

• To regulate air pressure

• To remove water from the air

What component ensures air flows in one direction only from the supply reservoir to the service reservoirs?

• Governor

• Air dryer

• Single check valve

• Purge valve

What triggers the air dryer's purge cycle?

• When the vehicle's engine is turned off

• When the air pressure reaches the governor cut out setting

• When the air pressure drops to 100 psi

• When the compressor stops compressing air

How is the air compressor lubricated?

• By pressurized engine oil

• By manual lubrication

• It is self-lubricating

• By a separate oil pump