MCQ Academy - English
Free Online MCQ Practice Tests in English
Popular Quiz Papers
Latest Quizzes
What is the proper way to test the air leakage rate?
Correct answer(s):
- Turn off the engine and release the parking brake
What is stab braking?
Correct answer(s):
- Applying your brakes until the wheels lock up, releasing, and then reapplying when the wheels start rolling
Why do air brakes take longer to stop than hydraulic brakes?
Correct answer(s):
- It takes longer for the air to flow through the lines
What will happen if your air compressor stops?
Correct answer(s):
- You'll still have air pressure left in the air tanks to stop
How should you check your air compressor governor “cut in” and “cut out” pressures?
Correct answer(s):
- Run the engine at a fast idle
- Step on and off the brake to reduce tank pressure
- Monitor the air pressure gauge
How fast should the air pressure build in a dual air system?
Correct answer(s):
- From 85 to 100 psi in 45 seconds
What are the typical air compressor governor cut-in and cut-out pressures?
Correct answer(s):
- Cut-in: 100 psi; Cut-out: 125 psi
What device will keep air in the tanks if the air compressor develops a leak?
Correct answer(s):
- The one way check valve
Which of the following devices indicates how much pressure you have in your air tanks?
Correct answer(s):
- Supply pressure gauge
Which of the following statements regarding spring brakes is true?
Correct answer(s):
- Spring brakes are held by mechanical force
At what air pressure must the low air pressure warning signal come on?
Correct answer(s):
- 60 psi
Which of the following statements is true regarding front wheel braking?
Correct answer(s):
- Front wheel braking is good under all conditions
Which of the following is the most common type of foundation brake?
Correct answer(s):
- S-cam drum brake
What psi level is the safety relief valve set to open at?
Correct answer(s):
- 150 psi
What is the alcohol evaporator’s primary purpose?
Correct answer(s):
- Put alcohol into the air system
What is the name of the device that pumps air into the air storage tanks?
Correct answer(s):
- Air compressor
What are the three types of brake systems used in a commercial vehicle air brake system?
Correct answer(s):
- Service brake, parking brake, emergency brake
What type of air do air brakes use?
Correct answer(s):
- Compressed air
Which device allows you to remove oil and water from the air brake systems?
Correct answer(s):
- Air tank drain
What does it mean when the safety valve opens and releases air?
Correct answer(s):
- The pressure has exceeded 150 psi
- Something is wrong, and a mechanic needs to check it