Combination Test

Question 1 of 72

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Glad hands are used to connect the:

Select one of the following:

  • Electric lines from the truck to the trailer

  • Kingpin from the tractor to the locking jaws on the glide plate

  • Service and emergency air lines from the truck to the trailer

Question 2 of 72

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. The trailer air supply control (or tractor protection valve control) should automatically close when the air pressure falls to between____ psi

Select one of the following:

  • 20 and 45

  • 60 and 85

  • 100 and 125

Question 3 of 72

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If you cannot make a tum without entering another traffic lane, you should:

Select one of the following:

  • Turn wide before you start your turn

  • Turn wide as you complete your turn

  • Not make that turn

Question 4 of 72

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If the spring brakes dont release when you push the trailer air supply control, you should:

Select one of the following:

  • Check the air Iines connections

  • Cross the air Ines

  • Check the electriIcal service cable

Question 5 of 72

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The front trailer supports are up and the trailer is resting on the tractor. Make sure:

Select one of the following:

  • There Is enough clearance between the upper and lower fifth wheel

  • The safety latch is in the unlocked posltlon .

  • There Is enough clearance between the tractor frame and landing gear

  • There is enough clearance between the tops of the tractor tires and the nose of the trailer

  • A and B are correct,

Question 6 of 72

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You supply air to the trailer tanks by

Select one of the following:

  • Pushing In the trailer air upply valve

  • Pulling out the trailer air suppIy valve

  • Connecting the service line gland

Question 7 of 72

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A driver crosses the air lines when hooking up to an trailer with no spring brakes. What will happen?

Select one of the following:

  • The hand valve will apply the tractor brake not the trailer brakes

  • The brake pedal will work the trailer spring brakes not the air brakes

  • The driver could drive away with no trailer brakes

Question 8 of 72

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Which part of the kingpin should the locking' jaws close around?

Select one of the following:

  • The shank

  • the head

  • the base

Question 9 of 72

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When coupling, the proper position of the fifth wheel is:

Select one of the following:

  • Level with the ground

  • Tilted up towards the end of the tractor

  • Tilted down towards the end of the tractor

Question 10 of 72

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To unlock the fifth wheel, pull the relead handle to the position.

Select one of the following:

  • open

  • neutral

  • closed

Question 11 of 72

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Before you back under a truck trailer, make iure the:

Select one of the following:

  • Trailer brakes are locked

  • Air supple know is in

  • Air brakes are off

Question 12 of 72

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After you connect the air Iines, but before you back under the trailer, you should:

Select one of the following:

  • Make sure the traile rakes are off

  • Walk around the rig to be sure it is clear

  • Supply air to the trailer system, then pull out the air supply knob

Question 13 of 72

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

Select one of the following:

  • Forward 50 feet, turning right, and left

  • The tractor ahead sharply to release the trailer brakes

  • The tractor ahead gently with the trailer brakes locked

Question 14 of 72

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When should you use the hand valve park a combination vehicle

Select one or more of the following:

  • To park at loading docks

  • To park on a grade

  • Never

Question 15 of 72

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The best way to tell if your trailer has started to skid to:

Select one of the following:

  • Hear the wheels skidding

  • See It In your mIrrors

  • Feel for "pulling" in the cab

Question 16 of 72

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You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should:

Select one of the following:

  • Back up gently to ease pressure on the fifth wheel locking jaws

  • Begin to lower the trailer landing gear

  • Immediately put on your tractor parking brakes

Question 17 of 72

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Why should you be sure that the fifth whee plate Is greased as required?

Select one of the following:

  • To ensure good electrical connections

  • To prevent steering problems

  • To reduce heat and noise

Question 18 of 72

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For a coupling to be complete, the safety catch for the fifth wheel locking lever must be:

Select one of the following:

  • Straight up

  • Through the locking lever

  • Over the locking lever

Question 19 of 72

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What will happen if the air lines are crossed when you hook up to an old trailer with no spring brakes

Select one of the following:

  • the hand vlave applles the tractor brakes instead of the trailer brakes

  • you could drive away with not trailer brakes

  • the brakes lights will not come on when you press the brake pedal

Question 20 of 72

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One the things a driver can do to prevent a rollover is to keep:

Select one or more of the following:

  • Both hands firmly on the steering wheel

  • the cargo has closed to the ground as possible

  • The fifth wheel free play as small as possible

Question 21 of 72

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To stop a trailer skid, you should:

Select one of the following:

  • Use the trailer hand brake

  • Release the service brakes

  • Countersteer

Question 22 of 72

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You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:

Select one of the following:

  • Empty

  • At normal pressure

  • Between 60 and 80 psi

Question 23 of 72

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When you get ready to back under under a trailer you should line up:

Select one of the following:

  • The left rear outside dual wheel with the kingpin

  • The kingpin with the edge of the drivers side locking jaw

  • Directly in front of the trailer.

Question 24 of 72

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A trailer is most likely to jackknife when it is

Select one of the following:

  • Loaded to full capaclty

  • over loaded

  • empty

Question 25 of 72

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You have a major leak in the service line and you put on the brakes. Service air pressure will escape and cause the:

Select one of the following:

  • Trailer emergency brakes to come on

  • Trailer tank pressure to be lost

  • Tractor spring brakes to lock on

Question 26 of 72

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The air leakage rate for a combination of two vehicles (engine off, brakes off) should not be greater than_______psi per minute.

Select one of the following:

  • 2

  • 3

  • 4

Question 27 of 72

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loss of air pressure in the emergency line causes:

Select one of the following:

  • the relay valves to close

  • An increase in air pressure to the service line

  • the trailer´s emergency brakes to come on

Question 28 of 72

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To prevent a jackknife in normal driving, some drivers use the hand valve before stepping on the brake pedal. Which of these statements is true?

Select one of the following:

  • It should not be done

  • It results in less skidding than using the brake pedal alone

  • it is the best way to brake and keep the truck in a straight line

Question 29 of 72

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A tractor with a(n)________trailer requires the shortest stopping distance

Select one of the following:

  • Empty

  • Lightly loaded

  • Fully Loaded

Question 30 of 72

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In general, the higher your truck´s center of gravity, ''the:

Select one of the following:

  • Easler it is to turn around comers

  • More stable it is when turning

  • Easier it is to turn over

Question 31 of 72

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Which of these statements is true?

Select one of the following:

  • The brake and suspension system of combination vehicles work best with a light load

  • Light vehicles need more braking power to stop than heavy ones.

  • "bobtail" tractors can take longer to stop than a combination vehicle

Question 32 of 72

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When should you use chocks to park a trairles not equipped with spring brakes?

Select one of the following:

  • Never

  • Always

  • Only when it will be parked on an incline

Question 33 of 72

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After you supply air to the trailer, make sure the air lines are not crossed and The trailer brakes are working. This is done by:

Select one of the following:

  • Turning on the parking brakes from the cab

  • Watching your mirrors to see if the trailer lights come on

  • Applying and releasing the trailer brakes and listening for brake sounds.

Question 34 of 72

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You are coupling a tractor to a semi trailer. You have backed up but are not under it. What should you hook up before backing under the semitrailer?

Select one of the following:

  • The emergency and service air lines.

  • The electrical service cable.

  • Nothing, back up and lock the fifth wheel.

Question 35 of 72

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You have uncoupled a trailer and you want to inspect the landing gear. the tractor should be positioned:

Select one of the following:

  • With the tractor frame under the trailer

  • Completely clear of the trailer

  • With the fifth wheel directly beneath the kingpin

Question 36 of 72

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When you are uncoupling a loaded trailer, lower the landing gear until it:

Select one of the following:

  • Makes firm contact with the ground

  • Makes contact with the groudn and lifts the trailer off of the fift wheel

  • Just reaches the ground

Question 37 of 72

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Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for avery_____feet of your vehicles length

Select one of the following:

  • 10

  • 20

  • 30

Question 38 of 72

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You are coupling a tractor to a semi trailer to your tractor but have not yet backed under it. The trailer is at the right height when:

Select one of the following:

  • The kingpin is about 1 1/4 inches above the fifth wheel

  • The end of the kingpin is even with the top of the fifth wheel

  • It will be raised slightly when the tractor is backed under it.

Question 39 of 72

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The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the____brake line

Select one of the following:

  • Service

  • Parking

  • Emergency

Question 40 of 72

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You are driving a combination vehicle. If the service air line comes apart but the emergency line stays together, what will happen right away?

Select one of the following:

  • The trailers air tank will exhaust through the open line

  • The emergency traller brakes will come on

  • Nothing is likely to happen until you try to apply the brakes

Question 41 of 72

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After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in the________position.

Select one or more of the following:

  • Down

  • Up

  • Normal

Question 42 of 72

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You should not back a tractor under a trailer until the whole air system is:

Select one of the following:

  • Empty

  • At normal pressure

  • Between 60 and 80 psi

Question 43 of 72

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When checking the trailer's emergency brakes, the tractor protection control valve should be placed in the ____ position.

Select one of the following:

  • Normal

  • Neutral

  • Emergency

Question 44 of 72

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You are driving a combination vehicle. The trailer breaks away and pulls apart both air lines. You would expect the trailer brakes to come on and the:

Select one of the following:

  • Tractot to lose all air pressure

  • Trailer supply valve to stay open

  • tractor protection valve to close

Question 45 of 72

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You want to inspect the trailer supports. You should place the tractor transmission in wich gear afet you have uncoupled the trailer?

Select one of the following:

  • Low reverse

  • Neutral

  • High reverse

Question 46 of 72

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Why should you lock the tractor glad hands (or dummy couplers) to each other when you are not towing a trailer?

Select one of the following:

  • The connected brake circuit becomes a back up air tank

  • It will keep water out of the lines

  • If you do not, you could never build system pressure

Question 47 of 72

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When backing under a tractor under a trailer you should expect:

Select one of the following:

  • Trailer will be lifted slightly when the tractor backs under it.

  • always approach the trailer at a slight angle

  • do it quickly to ensure that the kingpin is locked into the fifth wheel

Question 48 of 72

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after you have coupled the trailer, you should begin raising the landing gear by using the ___gear

Select one of the following:

  • Low

  • Mid-level

  • High

Question 49 of 72

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There are two things that can prevent a rollover, they are 1) keep the cargo as close to the ground as possible, and 2)

Select one of the following:

  • make sure the brakes are properly adjusted

  • Keep both hands firmly on the steering wheel

  • Go slow around turns

Question 50 of 72

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which of these vehicles off track the most

Select one of the following:

  • 5 axle tractor towing a 52 foot trailer

  • 5 axle tractor towing a 45 foot trailer

  • 5 axle tractor towing a 42 foot trailer

Question 51 of 72

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if you have coupled with a semitrailer, where should the front trailer supports be driving away

Select one of the following:

  • Raised 1/2 way with the crank handle secured in its bracket

  • Raised 3/4 way with the crank handle removed

  • Fully raised with the crank handle secured in its bracket

Question 52 of 72

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The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:

Select one of the following:

  • The trailer will not swivel on the fifth wheel

  • The parking lot is off and may drive away

  • The coupling is not right and should be fixed before driving the vehicle.

Question 53 of 72

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compared to a straight truck or bus there are ____things to inspect on a combination vehicle

Select one of the following:

  • fewer

  • he same amount

  • more

Question 54 of 72

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How much space should be between the upper and lower fifth wheel after coupling?

Select one of the following:

  • about 1/4 inch

  • just enough to see light through it

  • none

Question 55 of 72

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Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency line is ____; the service line is ____.

Select one of the following:

  • Red, blue

  • Blue, red

  • Black, yellow

  • Depends on the type of trailer

Question 56 of 72

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How should you test the tractor semi trailer connection for security?

Select one of the following:

  • Pull gently forward in low gear against the locked trailer brakes, then look at it carefully.

  • Put the tractor in gear and pull ahead with a sharp jerk.

  • Rock the trailer back and forth with the trailer brakes locked.

  • Don't worry. The connection should be fine.

Question 57 of 72

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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?

Select one of the following:

  • Nothing is likely to happen until you try to apply the brakes.

  • The trailer's air tank will exhaust through the open line.

  • The emergency tractor brakes will come on.

Question 58 of 72

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In normal driving, some drivers use the hand valve before applying the brake pedal to prevent a jackknife. Which of these statements is true?

Select one of the following:

  • It results in less skidding than using the brake pedal alone.

  • It should not be done.

  • It is the best way to brake and keep the truck in a straight line.

Question 59 of 72

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The safety catch for the fifth wheel locking lever must be ____ for a coupling to be complete.

Select one of the following:

  • Under the locking lever

  • Over the locking lever

  • Through the locking lever

Question 60 of 72

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Semi trailers made before 1975 that are equipped with air brakes:

Select one of the following:

  • Often do not have spring brakes.

  • Usually need a glad hand converter.

  • Are easier to brake because they are heavier

Question 61 of 72

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You are coupling a tractor and semi trailer and have connected the air lines. Before backing under the trailer, you should:

Select one of the following:

  • Make sure that the trailer brakes are off.

  • Supply air to the trailer system, then pull out the air supply knob to lock the trailer brakes.

  • Apply the brakes twice to alert others.

Question 62 of 72

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Which of these statements about stopping distance and speed is true?

Select one of the following:

  • You need about two times as much stopping distance at 40 mph as at 20 mph

  • Wet roads can double stopping distance at any speed

  • Att 55 mph, it will take about 10 seconds to stop your vehicle

Question 63 of 72

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Before loading, unloading, or driving a tanker, the first thing you should do is

Select one of the following:

  • Properly secure all of the bafles

  • Inspect the vehicle

  • Make sure the tanker is properly placarded

Question 64 of 72

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The best way to drive through a curve is to slow to a safe speed before entering the curve and then______ as you go through it.

Select one of the following:

  • Accelerate slightly

  • Coast

  • Brake lightly

Question 65 of 72

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Wich of these statements is true about emergency steering?

Select one of the following:

  • A move to your right may be best, if a oncoming driver drifts into your lane

  • You can always stop more quickly tan you can steer to avold a hazard

  • You can steer more quickly and safely with one hand tan with two

Question 66 of 72

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The hand valve should be used:

Select one of the following:

  • Only with a foot brake.

  • To test the trailer brakes

  • As a parking brake.

Question 67 of 72

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When driving a set of doubles it is necessary to close which shut-off valve in the last trailer

Select one of the following:

  • Front.

  • Middle section

  • Back.

Question 68 of 72

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You are about to back your tractor under a semitrailer. The trailer is at the right height when the:

Select one of the following:

  • Kingpin is about 1 1/4 inches above the fifth wheel.

  • End of the kingpin is even with the top of the fifth wheel

  • Trailer will be lifted slightly when the tractor backs under it.

Question 69 of 72

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When connecting the glad hands press the two seals with the coupler together at what decree to each other?

Select one of the following:

  • 45 degree

  • 190 degree.

  • 180 degrees.

Question 70 of 72

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Off-tracking or cheating causes of which of these to follow the wider pass while making a turn?

Select one of the following:

  • Tractor towing a 45-feet trailer

  • Tractor with two 27-feet trailers

  • 53-feet bobtail.

Question 71 of 72

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The iron trailer supports are up and the trailer is resting on the tractor. Make sure:

Select one of the following:

  • There is enough clearance between the upper and lower fifth wheels

  • The safety latch is in unlocked position.

  • There is enough clearance between the tractor frame and the landing gear

Question 72 of 72

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Air and electrical lines from the tractor to the trailer should be:

Select one of the following:

  • Fully tight but away a little looped.

  • Secured but with enough loop to turn.

  • Resting on the frame of the tractor

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Combination Test

Brenda Martinez9284
Quiz by , created over 1 year ago

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Brenda Martinez9284
Created by Brenda Martinez9284 over 1 year ago
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