Trailer Systems and Components

Question 1

I. The main advantage of using a deck trailer to carry cargo is _

Answer 1

The main advantage of using a deck trailer to carry cargo is easy access for loading
and unloading.

Question 2

2. A highboy trailer has the deck located:
   a) above the trailer wheels and suspension components.
   b) below the trailer wheels and suspension components.
   c) above the tractor/trailer wheels and suspension components.
   d) below the tractor/trailer wheels and suspension components.

Answer 2

. c) above the tractor/trailer wheels and suspension components.

Question 3

3. Two (2) advantages of a lowboy deck trailer are:
   a)
   b)

Answer 3

a) higher loads can be carried

b) the centre of gravity of the load is lower, increasing stability.

Question 4

4. Trailers that protect the load from environmental conditions are called:
   a) deck trailers.
   b) van trailers.
   c) dump trailers.
   d) extendable trailers.

Answer 4

b) van trailers

Question 5

5. Temperature-controlled trailers:
   a) expose the cargo to environmental conditions.
   b) keep the cargo warm.
   c) keep the cargo cool.
   d) keep the cargo at a constant temperature.

Answer 5

d) keep the cargo at a constant temperature.

Question 6

6. Tank type trailers are designed to carry liquid cargo only. ·
   a) true
   b) false

Answer 6

b) false; Tank type trailers can also carry granular/dry type materials

Question 7

7. Trailers that can be lengthened or shortened to accommodate loads of varying length
   are called

Answer 7

Trailers that can be lengthened or shortened to accommodate loads of varying length
are called extendable.

Question 8

8. Vehicle ground pressure is a measure of:

Answer 8

The amount of force created by the combined weight of the vehicle and its load
divided by the area of contact between the vehicle’s tires and the road surface.

Question 9

9. What type of coupling device is used to connect a pony trailer to a body loaded
   truck?

Answer 9

a pintle hook

Question 10

10. How many points of articulation are there on a body loaded truck and pony trailer?
    a) 1
    b) 2
    c) 3
    d) 4

Answer 10

a. 1

Question 11

11. A tractor and single semi-trailer are connected using a ________ __
    coupling and has ______ point of articulation.

Answer 11

A tractor and single semi-trailer are connected using a fifth wheel coupling and has
one point of articulation.

Question 12

12. The unit that takes some of the weight off of the tractor when oversized loads are
being hauled is called a:
a) converter dolly.
b) booster.
c) jeep.
d) C train.

Answer 12

c. jeep

Question 13

13. On an A train combination with two semi-trailers, the following semi-trailer is
connected to the lead trailer by a:
a) converter dolly.
b) booster.
c) jeep.
d) C train dolly.

Answer 13

a. converter dolly

Question 14

14. B train combinations are more stable during operation than A trains because

Answer 14

B train combinations are more stable during operation than A trains because the
following semi-trailer is connected to the lead trailer by a fifth wheel and kingpin
connection that provides only one point of articulation.

Question 15

15. The device that connects the following trailer to the lead trailer by two or more pin tie
    hooks, couplers, and drawbars is called a:
    a) fifth wheel.
    b) booster.
    c) Jeep.
    d) C train dolly.

Answer 15

d) C train dolly.

Question 16

16. An axle that causes the wheels to track parallel to the trailer frame rails at all times is
    called a

Answer 16

An axle that causes the wheels to track parallel to the trailer frame rails at all times is
called a fixed axle.

Question 17

17. Steering axles are used on some trailer units to

Answer 17

Steering axles are used on some trailer units to prevent tire scuffing when the
tractor/trailer combination negotiates a tight tum.