CDL General Knowledge Study Guide #3

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The total weight of the powered unit, the trailer, and the cargo is called: *

1 point

Gross vehicle weight

Gross combination weight

Gross axle weight

What is a "pull-up"? *

1 point

When pulling off the shoulder you pull up until the trailer is straight

A maneuver performed by a tow truck to pick up an overturned truck

Pulling forward while backing a trailer to reposition it

How can you avoid the effects that wet brakes can cause? *

1 point

Slow down and place the transmission in low gear

Gently put on the brakes and increase engine rpm, cross the water while keeping light pressure on the brakes

When out of water maintain light pressure on the brakes for a short distance

All of these answers are correct

Name some important steering system parts: *

1 point

Tie rod, spindle, and pitman arm

Leaf spring, vehicle frame, and torque rod

Main spring, axle, and spring shackle

What is the definition of "sleep debt"? *

1 point

The cumulative effect of not getting enough sleep

The money you owe hotels after resting there

The amount of sleep you get each day

What is the minimum tread depth for tires other than front tires? *

1 point

2/32 inch

3/32 inch

4/32 inch

Which of these is not a danger when an automatic transmission is forced into a lower gear at a high speed? *

1 point

Damage to the transmission

Loss of engine braking effect

Loss of steering control

The Commercial Driver's Handbook suggests several things to do when you pass a vehicle. Which of these is NOT one of them? *

1 point

Lightly tap your horn if needed

At night, turn on your high beams while you pass the vehicle

Assume the other driver does not see you

Which of these statements is true about vehicle fires? *

1 point

If the cargo or box trailer catches on fire, open the doors as soon as you can

If your engine is on fire, open the hood as soon as you can

A burning tire should be cooled with water

How long does it take a typical tractor-trailer to clear a single track? A double track? *

1 point

It takes 7 seconds to clear a single track, and more than 10 seconds to clear a double track

It takes 10 seconds to clear a single track, and more than 12 seconds to clear a double track

It takes 14 seconds to clear a single track, and more than 15 seconds to clear a double track

Name some suspension system defects: *

1 point

Broken leaves in leaf spring and cracked or broken spring hanger

Leaking shock absorbers

All of the answers are correct

You are driving a heavy vehicle and must exit a highway using an off-ramp that curves downhill. You should: *

1 point

Slow down to a safe speed before taking the curve

Slow down to the posted speed limit for the off ramp

Wait until you are in the curve before downshifting

Name two situations where legal maximum weights may not be safe to haul: *

1 point

During bad weather or in mountains

Through tunnels and over bridges

At night or during heavy traffic

The tendency for long commercial vehicles to swing wide on turns is called: *

1 point

Off-tracking

Hydroplaning

Fishtailing

Name some things you should check on the FRONT of your vehicle during your pre-trip inspection: *

1 point

Low beams, high beams, four way flashers, and turn signals

Windshield wipers, mirrors, and hood latches

Oil, transmission, air compressor, and radiator

Why should you be in the proper gear before starting down a hill? *

1 point

Because you need to be in the same gear at the bottom of the hill

You will not be able to shift into a lower gear once you are going down a hill

Because the clutch is made to be used on even surfaces

What is an advantage of going right instead of left around an obstacle? *

1 point

There is no advantage

It is much easier to turn a truck to the right

If you are blocked on both sides, a move to the right won't force anybody into an opposing traffic lane and a possible head-on collision

What is the minimum tread depth for front tires? *

1 point

1/32 inch

2/32 inch

4/32 inch

What is a hazardous materials placard? *

1 point

Signs put on the outside of a vehicle which identify the hazard class of the cargo

Signs put on the back of a vehicle which identify the hazard class of the cargo

Signs put on the outside of a vehicle which identify the hazard class and weight of the vehicle

Which of these statements is true about causes of vehicle fires? *

1 point

Under-inflated tires will NOT cause a vehicle fire

Carrying a properly charged fire extinguisher will help prevent fires

Poor trailer ventilation can cause flammable cargo to catch on fire

Which of these statements is true about brakes. *

1 point

Brakes absorb more heat when stopping heavier vehicles

Brake drums cool very quickly when the vehicle is moving very fast

Brake fade is not caused by heat

What is the minimum length for mud flaps? *

1 point

Within 6 inches of the surface of the road

Within 8 inches of the surface of the road

Within 10 inches of the surface of the road

What should you do if you get stuck on the railroad tracks? *

1 point

Scream for help

Get out of your vehicle and away from the tracks

Stay in your vehicle

Which of the following does not provide extra gears on some trucks? *

1 point

Automatic transmissions

Auxiliary transmissions

Multi-speed rear axles

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