Doubles and Triples Endorsement Test 2024

What is a coupling device of 1 or 2 axles and a fifth wheel by which a semi- trailer can be coupled to the rear of a tractor-trailer combination forming a double bottom rig?

The shut off valves at the rear of the front trailers should be

When inspecting the lower fifth wheel, check that locking jaws are around the head of the kingpin, not the shank.

How many methods are there to secure a second trailer before coupling?

How do you check to make sure that trailer height is correct before coupling?

When inspecting the converter dolly, if a spare tire is carried, make sure it is secure. Make sure the pintle-eye of the dolly is in place in the pintle hook of the trailers.

To check that air flows to all the trailers, you open the emergency line shut-off valve at the rear of the last trailer; you should hear air escaping. Open the service line valve to check that service pressure goes through all the trailers.

You should pull a dolly out from under a trailer after you disconnect it from the trailer in front.

For safest handling on the road, the more heavily loaded semi-trailer should be in the first position behind the tractor.

To check whether or not convert dollies are equipped with ABS, check for a yellow lamp