CDL Air Brakes Practice Test 1

Question 1

What type of air do air brakes use?

Accepted Answer

Compressed air

Answer

Decompressed air

Answer

Warm air

Answer

Heated air

Question 2

What are the three types of brake systems used in a commercial vehicle air brake system?

Accepted Answer

Service brake, parking brake, emergency brake

Answer

Hand brake, parking brake, emergency brake

Answer

Anti-lock brake, service brake, emergency brake

Answer

Service brake, hand brake, emergency brake

Question 3

What is the name of the device that pumps air into the air storage tanks?

Accepted Answer

Air compressor

Answer

Governor

Answer

Evaporator

Answer

Safety valve

Question 4

What is the alcohol evaporator's primary purpose?

Accepted Answer

Put alcohol into the air system

Answer

Remove water and oil from the air brake system

Answer

Remove alcohol from the air brake system

Answer

To heat the air tank

Question 5

What psi level is the safety relief valve set to open at?

Accepted Answer

150 psi

Answer

125 psi

Answer

60 psi

Answer

100 psi

Question 6

Which of the following is the most common type of foundation brake?

Accepted Answer

S-cam drum brake

Answer

Wedge brake

Answer

Disc brake

Answer

Anti-lock brake

Question 7

Which of the following statements is true regarding front wheel braking?

Accepted Answer

Front wheel braking is good under all conditions

Answer

Front wheel braking will cause skids on ice

Answer

You should put a front brake limiting valve (if equipped) on the slippery position in adverse conditions

Answer

Front wheel braking is ineffective in slippery conditions

Question 8

At what air pressure must the low air pressure warning signal come on?

Accepted Answer

60 psi

Answer

150 psi

Answer

50 psi

Answer

45 psi

Question 9

Which of the following statements regarding spring brakes is true?

Accepted Answer

Spring brakes are held by mechanical force

Answer

Spring brakes will come on at 60 psi

Answer

Spring brakes use air pressure to stop a vehicle

Answer

Spring brakes will not function if the system loses air pressure

Question 10

Which of the following devices indicates how much pressure you have in your air tanks?

Accepted Answer

Supply pressure gauge

Answer

Application pressure gauge

Answer

Low air pressure warning signal

Answer

Ammeter