Air Brakes #2 - Massachusetts Cdl

1 . A tank endorsement is:

Only required when transporting gases. Only required when transporting liquids. Used when transporting both liquids and gases. Optional when transporting hazardous materials. Click Here Full Cheat Sheet

2 . What does the air compressor governor do?

Controls when the air compressor pumps air into the air storage tanks. Controls how quickly air leaves the air storage tanks. Controls the temperature of the air entering the air storage tanks. Controls the temperature of the air leaving the air storage tanks. Take a FREE Practice Test Now

3 . Braking mechanisms are located ____ a brake drum.

Outside Inside Next to On top of Take a FREE Practice Test Now

4 . During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.

1 psi 2 psi 3 psi 4 psi Take a FREE Practice Test Now

5 . A low air pressure warning signal should activate:

When tank pressure falls below 120 psi. When tank pressure falls below 60 psi. When tank pressure falls below 10 psi. When tank pressure falls below 5 psi. Click Here Full Cheat Sheet

6 . The air pressure in a dual air brake system should build from 85 to 100 psi within:

Two minutes. 15 seconds. 10 minutes. 45 seconds. Take a FREE Practice Test Now

7 . Which type of brakes do most heavy-duty vehicles have?

Air brakes Solid brakes Liquid brakes Gravity brakes Take a FREE Practice Test Now

8 . Air tanks usually hold enough compressed air:

For one stop before needing to be refilled. For several stops before needing to be refilled. For a day’s worth of braking. For an unlimited number of stops. Take a FREE Practice Test Now

9 . When you need to stop in an emergency, you should:

Lock the wheels and skid to a stop. Stop in a way that keeps your vehicle in a straight line. Stop in a way that turns your vehicle. Expect your vehicle to slow down more quickly than usual. Click Here Full Cheat Sheet

10 . An air brake-equipped vehicle traveling at a speed of 55 mph under ideal driving conditions will need approximately ____ to come to a complete stop.

100 feet 250 feet 300 feet 450 feet Take a FREE Practice Test Now

11 . All air tanks must include:

A drain valve. A lock. A trap door. A warning sticker. Take a FREE Practice Test Now

12 . If the brake pads rub against the brake drums and create too much heat:

The brakes will stick. The brakes will become extra sensitive. The brakes may stop working. The air compressor will kick on to cool the brakes. Take a FREE Practice Test Now

13 . Brake fading is caused when:

Brakes are not used often enough. Brakes overheat. Brakes are too cold. Brakes are wet. Click Here Full Cheat Sheet

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14 . Air tank drains:

Should not be used in cold weather. Are helpful to remove water and oil from the air tanks. Are used to move air to the brakes. Clean the air in the passenger compartment. Take a FREE Practice Test Now

15 . When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:

Slack adjuster. Axle. Brake drum. Alcohol evaporator. Take a FREE Practice Test Now

16 . Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS). Bluetooth. GPS. A rear back-up camera. Take a FREE Practice Test Now

17 . You should not use the parking brake:

If your vehicle is stopped on a level surface. If your vehicle is stopped on a slight incline. If your vehicle's brakes are very hot. If your vehicle's other braking systems seem to be working adequately. Click Here Full Cheat Sheet

18 . The parking brake should be:

Used whenever you park your vehicle. Used while driving. Set when driving in bad weather. Removed. Take a FREE Practice Test Now

19 . Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when:

Air pressure falls below 45 psi. Air pressure falls below 20 psi. Driving downhill. Driving uphill. Take a FREE Practice Test Now

20 . Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.

25 psi 50 psi 75 psi 100 psi Take a FREE Practice Test Now

21 . Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.

10 psi 25 psi 50 psi 100 psi Click Here Full Cheat Sheet

22 . Test the low pressure warning signal:

Once a month. Once a week. Twice a week. Before every trip. Take a FREE Practice Test Now

23 . Why do large vehicles use air brakes?

Other brake systems squeak too loudly. Air braking systems are very effective. Air brakes are complicated. Air is free. Take a FREE Practice Test Now

24 . The ____ tells a driver how much pressure is in the air tanks.

Application pressure gauge Air compressor governor Supply pressure gauge Drum brake Take a FREE Practice Test Now

25 . Air tank drains:

Allow rain water to enter the tanks. Are used to drain water and oil from the air tanks. Should never be opened. Must remain open while driving. Click Here Full Cheat Sheet