DSL-204 Chap 39 Fifth Wheels and Hitching Devices:

Technician A says that a terminal tractor is built to move semi-trailers around a warehouse yard. Technician B says that a terminal tractor is built to move full trailers around a warehouse yard. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

Tires should apply no more than how many pounds per square inch of road contact patch?

• 10,000 lb

• 600 lb

• 300 lb

• 1000 lb

For tandem axles, the total weight limit is typically __________ for a vehicle with its full weight on two or more consecutive axles that are between 40" and 96".

• 34,000 lb

• 24,000 lb

• 44,000 lb

• 14,000 lb

Which of these refer to the maximum design weight of a vehicle including a full tank of fuel, fully loaded to its capacity, and with all passengers?

• Gross vehicle weight (GVW)

• Gross weight limits

• Gross combined weight

• Gross weight

Technician A says that couplers are hitching devices that look like pintle hooks except the towing horn pivots. Technician B says that couplers have a wider opening. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

__________ are used to connect two vehicles to a tractor or lead towing unit.

• Draw bars

• Pintle hooks

• Couplers

• Snubbers

The fifth wheel articulates against the upper coupler plate, attached to the trailer, and rotates around the upper coupler __________.

• Kingpin

• Fifth wheel

• Vertical load

• Draw bar

Which of the following is the steel plate, load-bearing surface on the underside of the front of a semi-trailer?

• Draw bar

• Upper coupler

• Fifth wheel

• Converter dolly

ConMet, Fontaine, and Jost are all manufacturers that offer fifth wheels with a locking-bar locking mechanism called a(n) ___________.

• No-slack coupler

• A-type lock jaw

• Secondary safety latch

• B-type lock

What are most fifth wheel top plates made from?

• Stamped or cast steel

• Teflon

• Tempered alloy steel

• Quenched alloy steel