Ontario Air Brake Test - Quiz 04 (30)

Question 1

You should begin a test of the low air pressure warning device with the pressure above…?

Answer 1

621 kPa (90 psi)

Question 2

When applying a test to the spring brakes, the test is only passed if…?

Answer 2

The vehicle only rocks slightly

a. The wheels do not turn the more than three quarters of a revolution
b. The vehicle only rocks slightly
c. The wheels do not turn more than two revolutions
d. The vehicle does not travel forward more than 2 m

Question 3

A straight truck, tractor or bus must not lose air pressure with the brakes fully applied at a rate of more than…?

Answer 3

21 kPa (3 psi) per minute

a. 21 kPa (3 psi) per minute
b. 37 kPa (5.3 psi) per minute
c. 34 kPa (5 psi) per minute
d. 25 kPa (3.6 psi) per minute

Question 4

The amount of moisture discharged from tanks other than the supply tank should be…?

Answer 4

Less than that from the supply tank

a. Less than that from the supply tank
b. The same as that from the supply tank
c. Any of these
d. More than that from the supply tank

Question 5

The outer cover of an air line has been damaged, but there is no leak to the inner tube. What action should you take?

Answer 5

Have the line replaced

a. Make a note to monitor it
b. None
c. Have the line replaced
d. Wrap the damaged area with tape

Question 6

You should make sure that air tanks are securely attached to the vehicle by…?

Answer 6

Pulling on them

a. Looking at them
b. Any of these
c. Pulling on them
d. Tapping them

Question 7

When checking air brake chambers, you should be looking out for…?

Answer 7

All of these things

a. Non-manufactured holes
b. Mismatched slack adjuster lengths
c. Cracks

Question 8

If a vehicle has a foundation brake defect, the Ontario Highway Traffic Act specifies that it may not…?

Answer 8

Be operated on any road or highway

a. Be operated on any high speed road
b. Be operated on any road or highway
c. Be operated on the road except to be taken to be fixed
d. Be operated in urban areas

Question 9

The low air pressure warning device is defective if it fails to activate at a minimum level of…?

Answer 9

380 kPa (55 psi)

a. 380 kPa (55 psi)
b. 480 kPa (69 psi)
c. 180 kPa (26 psi)
d. 280 kPa (40 psi)

Question 10

If air brake chambers on different sides of an axle are different sizes, this may cause…?

Answer 10

Braking imbalances

a. Skidding
b. Braking imbalances
c. Tire wear
d. Reduced braking force

Question 11

When the air pressure has been reduced to below 552 kPa, it should then be able to rise from 587 kPa to 690 kPa within…?

Answer 11

Two minutes

Question 12

Brake lining is the friction material that is fastened to…?

Answer 12

The brake shoe

Question 13

The discovery of a small quantity of oil is only no cause for concern if it comes from…?

Answer 13

The supply tank

Question 14

Air compressors should always be inspected with…?

Answer 14

The engine off

Question 15

An air pressure buildup time test should be made with the engine idling between…?

Answer 15

600 - 900 RPM

Question 16

The amount of air loss from a system should be measured with the brake fully applied for how long?

Answer 16

One minute

Question 17

A tractor protection valve should be tested by disconnecting the trailer service line and then…?

Answer 17

Applying the brake pedal

Question 18

When checking a vehicle’s brake drums, you should be looking out for…?

Answer 18

Cracks

Question 19

Actual cut-out pressure must never be higher than…?

Answer 19

1000 kPa (145 psi)

Question 20

A tractor hauling two or more trailers must not lose air pressure with the brakes fully applied at a rate of more than…?

Answer 20

41 kPa per minute

Question 21

The minimum pressure for compressor cut-in is…?

Answer 21

552 kPa (80 psi)

Question 22

When testing the spring brakes on a towing vehicle and trailer, it is preferable to perform the test on…?

Answer 22

The towing vehicle

Question 23

You must never make an inspection of your brakes unless…?

Answer 23

All of these apply

a. All of these apply
b. Wheel chocks or blocks are in place
c. The spring brakes are applied
d. The vehicle is on level ground

Question 24

Brake lining can be contaminated by…?

Answer 24

Grease and Oil

Question 25

The maximum allowable air loss for a tractor and trailer when the brakes are applied is…?

Answer 25

28 kPa (4 psi) per minute

Question 26

The drive belt of an air compressor should give slightly under…?

Answer 26

Firm hand pressure

Question 27

Spring brakes should be tested by applying the brakes and…?

Answer 27

Gently applying engine power in a low gear

Question 28

Air brake chamber leaks must be inspected for with…?

Answer 28

Spring brakes released and service brakes applied

Question 29

The application of the automatic trailer spring brakes can be confirmed by…?

Answer 29

Gently applying engine power

Question 30

The recommended way to test a trailer’s automatic spring brakes is to…?

Answer 30

Pull out the trailer supply valve