FREE AND STUDY GAMES ABOUT COMBINATION EXAM

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FREE AND STUDY GAMES ABOUT COMBINATION EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -80 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Which part of the kingpin should the locking jaws close around?

Answer:

The shank.

Question 2: When should you use the hand valve to park a combination vehicle?

Answer:

Never Question 3: The maximum leakage rate for a combination vehicle with the engine off and brakes

on is:

Answer:

• psi per minute.

Question 4: What should you do just before the tractor is coupled?

Answer:

Connect the emergency and service air lines

Question 5: After you lock the kingpin into the fifth wheel, you should check the connection by:

Answer:

Pulling the- tractor ahead gently with the trailer brakes locked.Question 6: You have coupled with a semi-trailer. Where should you put the front trailer supports before driving away?

Answer:

Fully raised with the crank handle secured in its bracket.Question 7: You are driving a combination vehicle when the trailer breaks away, pulling apart

both air lines. You would expect the trailer brakes to come on and:

Answer:

The tractor protection valve to close.

Question 8: Why should you connect the air hose couplers together?

Answer:

To keep the dirt and water out of the lines.Question 9: The safety catch for the fifth wheel locking lever must be:

Answer:

Over the locking lever.Question 10: What happens when you cross the air lines of an older trailer without spring brakes?

Answer:

You could drive away, but have no trailer brakes.Question 11: You can prevent a roll over by keeping the cargo as close to the ground as

possible and:

Answer:

Going slow around curves.Question 12: The service air line:

Answer:

Carries air to the trailer brakes.

Question 13: There are two things that a driver can do to prevent a rollover. They are: Keep the

cargo as close to the ground as possible, and:

Answer:

Reduce speed before entering turns Question 14: You're hooking a tractor to a semi-trailer and have backed up but are not under it.What should you do before backing under the trailer?

Answer:

Hook up the emergency and service air lines Question 15: When you get ready to back under a semi-trailer, you should line up:

Answer:

Directly in front of the trailer.Question 16: After connecting the air lines but before braking under the trailer, you should:

Answer:

Walk around the rig to be sure that it is clear.Question 17: You are coupling a tractor to a semi-trailer and have backed up but are not under it. What should you hook up before backing under?

Answer:

The emergency and service air lines.Question 18: Offtracking is:

Answer:

When the rear wheels follow a different path than the front wheels.Question 19: If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?

Answer:

Nothing is likely to happen until you try to apply the brakes.Question 20: You're driving a combination vehicle when the trailer breaks away and pulls apart

the air lines. You should expect the trailer brakes to apply and:

Answer:

The tractor brakes to keep working properly

Question 21: If the service line disconnects while you're driving, what will happen right away?

Answer:

Nothing is likely to happen until you try the brakes Question 22: Air brake equipped trailers made before 1975:

Answer:

Usually do not have spring brakes

Question 23: Which of these statements is true?

Answer:

"Bobtail" tractors can take longer to stop than a combination vehicle loaded to maximum gross weight.Question 24: How much space should be between the upper and the lower fifth wheel plates?

Answer:

None Question 25: The tractor protection valve will close automatically when:

Answer:

The air pressure is low (20 to 45 psi).Question 26: You should use the trailer hand valve:

Answer:

To test the trailer brakes.Question 27: Here are two things that a driver can do to prevent a rollover. They are: (1) Go slow

around turns; and (2):

Answer:

Keep the cargo as close to the ground as possible.Question 28: Your emergency air line breaks or gets pulled apart while you are driving. The loss

of pressure will cause the:

Answer:

Emergency trailer brakes come on.