Wyoming Doubles/Triples CDL Practice Test

This is a free 20-question practice test for the Doubles/Triples portion of the Wyoming Commercial Driver's License knowledge exam. Questions are pulled from a pool of 50 drawn from the AAMVA CDL Manual, which is the source document the Wyoming Department of Transportation Driver Services uses to write its actual exam.

How it works: Click an answer. The correct choice highlights in green, and you'll see a short explanation. Aim for 85% or better before you sit for the real test in Wyoming.

Question 1 of 20

The "T" endorsement is required to:

Drive any commercial vehicle
Pull two or more trailers
Drive a bus
Haul hazmat

Correct. The T endorsement is required to pull more than one trailer (doubles or triples).

Question 2 of 20

Drivers should always couple the heaviest trailer:

Behind the tractor (in the front position)
At the rear
In the middle
It does not matter

Correct. Heaviest trailer goes directly behind the tractor; lightest goes at the rear. This minimizes rearward amplification and rollover risk.

Question 3 of 20

When uncoupling the converter dolly from the lead trailer:

Lower trailer landing gear (if applicable), disconnect air and electrical, remove safety chains, then release pintle hook
Just unhook the chains and pull away
Drive forward fast
Use only the trailer brake

Correct. Standard sequence: support the trailer (landing gear if it is a semi-trailer), disconnect lines, remove chains, release pintle hook.

Question 4 of 20

On a steep downgrade with doubles, you should:

Select a lower gear before starting down and use intermittent firm braking
Coast in neutral
Use only trailer brake
Stay in high gear

Correct. Same rule as any combination vehicle, but plan extra margin: doubles take longer to stop and the rear trailer may push.

Question 5 of 20

A "doubles" combination uses a tractor plus:

Two trailers connected by a dolly
One trailer
Three trailers
No trailers

Correct. Doubles = tractor + lead semi-trailer + converter dolly + second semi-trailer (which becomes a full trailer once on the dolly).

Question 6 of 20

Before connecting a converter dolly, you should:

Inspect tires, brakes, fifth-wheel jaws, and overall condition
Skip inspection
Only check the tires
Only check the lights

Correct. Pre-trip the dolly: tires, brake adjustment, fifth-wheel jaws (open and clean), pintle hook, electrical receptacle, lights.

Question 7 of 20

When inspecting a doubles or triples rig, you should additionally check:

Each pintle hook, each set of safety chains, each converter dolly, each trailer's lights, brake chamber connections, glad-hands, and shut-off valves
Only the lead trailer
Only the tractor
Only the cargo

Correct. Every connection point and every trailer needs inspection — pintle hooks, chains, dollies, lights, brake lines, glad-hands, and air-supply valves.

Question 8 of 20

A pintle hook is:

The hitch on the rear of a trailer used to tow another trailer or dolly
The kingpin
The fifth wheel
A type of placard

Correct. The pintle hook is the strong rear-mounted hitch that grips the dolly's lunette eye, allowing one trailer to tow another behind it.

Question 9 of 20

When pulling triples, you should:

Make abrupt lane changes
Drive in the right lane and avoid abrupt steering
Drive in the left lane
Drive at top speed

Correct. Stay right, plan lane changes well in advance, signal early, and avoid abrupt steering. Triples crack-the-whip violently.

Question 10 of 20

When adjusting the order of trailers in a multi-trailer rig:

Place the heaviest immediately behind the tractor and progressively lighter to the rear
Place the heaviest at the rear
Order does not matter
Order is alphabetical

Correct. Heaviest first, lightest last. This minimizes rearward amplification and rollover risk in the rear trailers.

Question 11 of 20

A "set of doubles" typically refers to:

A tractor pulling two trailers
One tractor with one long trailer
Two tractors and a trailer
Two tractors and two trailers

Correct. A "set of doubles" is one tractor pulling two trailers (typically two pups, each about 28 feet long, in LTL operations).

Question 12 of 20

Inspecting safety chains on a converter dolly:

Verify they are correctly crossed and have no broken links, deformations, or wear
Skip the chains
Replace them daily
Verify color only

Correct. Safety chains should be intact, no broken links or excessive wear, and properly crossed under the pintle for support.

Question 13 of 20

A doubles rig is more likely to roll over than a single because:

The center of gravity is higher
The crack-the-whip effect amplifies steering input at the rear, where rollover threshold is lower
It is heavier
It is shorter

Correct. Multi-trailer rollover comes from rearward amplification — even modest steering input at the tractor becomes a violent swing at the rear trailer.

Question 14 of 20

The driver of a doubles rig should:

Make slow, gradual steering and braking inputs
Drive aggressively
Use only the trailer brake
Honk frequently

Correct. Smooth, gradual inputs are critical. Avoid abrupt steering and abrupt braking.

Question 15 of 20

When parking a doubles rig:

Park where you can pull straight out — back-out is impractical
Back into any spot
Park in the entrance
Block the lane

Correct. Choose pull-through parking. Multi-trailer rigs cannot back any meaningful distance safely.

Question 16 of 20

When you uncouple a converter dolly, you should:

Disconnect air and electrical, secure or remove safety chains, then release the pintle hook
Just yank it off
Drive forward fast
Use only the trailer brake

Correct. Park level, disconnect air and electric, lower trailer landing gear if applicable, remove safety chains, then release the pintle hook to free the dolly.

Question 17 of 20

A converter-dolly fifth wheel must be:

Properly lubricated and have correctly functioning locking jaws
Painted
Wide
Empty

Correct. Inspect for proper lubrication, no excessive wear, and confirm the locking jaws operate correctly. The dolly fifth wheel is just as critical as the tractor's.

Question 18 of 20

A converter dolly is:

A small hand truck
A set of axles with a fifth wheel that converts a semi-trailer into a full trailer for use in doubles/triples
A trailer-loading device
A type of brake

Correct. A converter dolly has a small frame, axle(s), and a fifth wheel mounted on top — it transforms a semi-trailer into a full trailer behind another trailer.

Question 19 of 20

Triples are restricted in many states. You should:

Drive triples anywhere
Verify state-by-state legality before crossing into a state
Use a special placard
Avoid driving in cities

Correct. Many states restrict triples to specific routes (turnpikes, designated corridors). Verify legality and route before crossing into a state.

Question 20 of 20

When pulling a heavy lead trailer and a light second trailer, the rig:

Will be more stable than the reverse
Is more likely to roll the rear trailer
Is illegal
Drives the same as either order

Correct. Heaviest in front, lightest in rear. Heavy at the rear amplifies crack-the-whip and rollover risk.

About the Wyoming Doubles/Triples exam

Most states administer 20 Doubles/Triples questions and require 80% to pass. The exam emphasizes coupling and uncoupling the converter dolly, rearward amplification (the "crack-the-whip" effect), and the unique inspection and handling demands of multi-trailer rigs.

The Wyoming Department of Transportation Driver Services follows the federal CDL standards established by FMCSA. To earn the Doubles/Triples credential, you must answer at least 80% of the questions correctly. Many candidates score lower the first time because the test pulls from a large pool — refreshing this page will give you a different mix of questions, drawn from the same authoritative source.

Want more practice? Try the full Doubles/Triples question bank or browse all Wyoming CDL practice tests.