CDL Practice Test Quiz Latest Updated
with Complete Solutions
A railroad crossing is ahead of you and you are hauling hazardous material. When you stop for the
crossing, you can stop as far away as ____ feet from the
...
CDL Practice Test Quiz Latest Updated
with Complete Solutions
A railroad crossing is ahead of you and you are hauling hazardous material. When you stop for the
crossing, you can stop as far away as ____ feet from the nearest rail. Correct Answer-50
Who is responsible for safely transporting a hazardous material shipment without delay and keeping the
shipping papers in the right place? Correct Answer-the driver
You find an overheated tire during an enroute inspection. If you are hauling hazardous materials, you
must: Correct Answer-Remove the tire and place it a safe distance from the vehicle.
The intent of hazardous materials regulations is to ensure safety, to contain the material, and: Correct
Answer-to communicate the risk
The total transport index of all radioactive material packages in a single vehicle must not exceed ____.
Correct Answer-50
You are going to be hauling hazardous materials over a route you do not know well. When should you
check the route and get the permits needed for the trip: Correct Answer-before starting the trip
Which three hazard classes should not be loaded into a trailer that has a heater / air conditioner unit.
Correct Answer-flammable liquids
flammable gas
explosives
What is the only exception to certification by a shipper? Correct Answer-Correct When the shipper is a
private carrier of his own product.
A truck carrying explosives has crashed with another vehicle. You should not pull them apart until.
Correct Answer-correct The explosives have been placed at least 200 feet away from the vehicles and
occupied buildings.When handling packages of explosives, you must: Correct Answer-Correct Never use hooks or other
metal tools
When driving with more than one trailer, which trailer should be the first one behind the tractor?
Correct Answer-correct Answer: The heaviest trailer
You are driving a 100 foot twin trailer combination at 50 mph. The road is dry and the visibility is good.
You should keep at least ____ seconds of space ahead of you. Correct Answer-Correct Answer: 11
With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of
the rig. When you do this, you should hear: Correct Answer-Correct Answer: Air escape from the open
valve
You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking
you should: Correct Answer-Correct Answer: Use controlled or stab braking
Converter dollies: Correct Answer-Correct Answer: Often do not have spring brakes
The crack the whip effect that troubles trucks with trailers. Which is most likely to tip over: Correct
Answer-Correct Answer: The rear trailer of a triple
You are doing a walk around inspection of a double or triple trailer rig. You should be sure the converter
dolly air tank drain valves are ____ and the pintle hook is ____. Correct Answer-closed, latched
When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig
straight? Correct Answer-Correct Answer: Never
If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably
happen? Correct Answer-Correct Answer: The dolly tow bar may fly up
You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking
you should: Correct Answer-: Use controlled or stab brakingYou are visually checking the coupling of a converter dolly to the rear trailer. How much space should be
between the upper and lower fifth wheel? Correct Answer-none
When should you check your mirrors while making a lane change? Correct Answer-...a. After signaling
the change
b. Right after starting the lane change
after completing lane change
Which of these statements about managing space to the sides is true? Correct Answer-...Correct
Answer: You should avoid traveling next to others when possible
Which of these statements about handling of doubles and triples is true? Correct Answer-...Correct
Answer: A sudden movement with the steering wheel can result in a tipped over rear trailer
How can you be sure you supplied air to a second trailer? Correct Answer-...Correct Answer: Go to the
rear of the second trailer and open the emergency line shut off
You should check the height of the trailer before connecting a converter dolly to a second or third
trailer. The trailer height is right when: Correct Answer-...a. The trailer will be raised slightly when the
converter dolly is backed under it.
You want to hook your combination to a second trailer that has no spring brakes. To do this without
wheel chocks you should: Correct Answer-...Correct Answer: Supply air to the trailer air system with the
tractor and then disconnect the emergency line
Which of these will result in the best control on curves? Correct Answer-d. Slowing to a safe speed
before entering the curve, then accelerate slightly during the curve
Before you can supply air to the air tanks of a second trailer you need to: Correct Answer-c. Open the
shut off valves at the rear of both trailersYou 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? Correct Answer-Correct Answer: The emergency and service air lines.
You have coupled with a semi trailer. In what position should you put the front trailer supports before
driving away? Correct Answer-Correct Answer: Fully raised with the crank handle secured in its bracket.
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The
emergency line is ____; the service line is ____. Correct Answer-Correct Answer: Red, blue
Which of these statements is true? Correct Answer-Correct Answer: "bobtail" tractors can take longer to
stop than a combination vehicle loaded to the maximum gross weight.
You are coupling a tractor and semi trailer and have connected the air lines. Before backing under the
trailer, you should: Correct Answer-Correct Answer: Supply air to the trailer system, then pull out the air
supply knob to lock the trailer brakes.
The hand valve should be used: Correct Answer-Correct Answer: To test the trailer brakes.
The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than ____ psi
per minute. Correct Answer-Correct Answer: 3
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:
Correct Answer-Correct Answer: The coupling is not right and should be fixed before driving the vehicle.
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: Correct Answer-Correct Answer: The tractor protection
valve to close.
Semi trailers made before 1975 that are equipped with air brakes: Correct Answer-Correct Answer:
Often do not have spring brakes.
[Show More]
