190102 A

Question 1

List the 3 functions of a vehicle frame.

Answer 1

1. Support the load the vehicle is carrying
2. Resist shock and torsional loads while vehicle in operation
3. provide a platform where motor components are attached

Question 2

Define maximum bending moment

Answer 2

The pont at whiuch the aximium force is concentarted on a frame

Question 3

Which 2 components make up a ladder type frame?

Answer 3

1. Parallel frame rails
2. Cross members

Question 4

What is the function of the frame crossmembers?

Answer 4

to reinforce the frame assembly

Question 5

Which one of the following is not a common frame rail shape?
a) trapezoid
b) channel
c) box
d) I-beam

Answer 5

Trapezoid

Question 6

What is the surface between the flanges of an I-beam frame rail called?

Answer 6

Web

Question 7

What is the function of a gusset that is attached to a frame crossmember?

Answer 7

Provide resistance to frame weaving

Question 8

The _________ and _________of frame components affect the strength of the frame.

Answer 8

size and strength

Question 9

Define the term yield strength as it applies to the strength of frame materials.

Answer 9

Refers to the amount of stress that the material can withstand without becoming deformed

Question 10

Which of the following frame materials would have the highest yield strength?
a) mild steel
b) high strength, low alloy steel
c) heat-treated alloy steel
d) copper-aluminum alloy

Answer 10

c) heat-treated alloy steel

Question 11

The term section modulus refers to the strength of frame components based on which 4 aspects?

Answer 11

1) height
2) Width
3) thickness
4) Shape

Question 12

A frame with a high resisting bending moment (RBM) has _____________ than a frame with a low RBM.

Answer 12

less strength

Question 13

List four (4) functions of a vehicle suspension system.

Answer 13

1) Secure the axles to the frame while maintaining proper alignment.
2) Support the weight of the vehicle and its cargo while maintaining lateral stability.
3) Cushion shock loads.
4) Allow axle movement so that the tires follow the contour of the road.

Question 14

The combined weight of the components below the connection point is called ______________ because ____________

Answer 14

unsprung weight because it is located below the suspension system

Question 15

The suspension system must hold the axles in alignment with the frame. This means the wheels are held ____________________

Answer 15

wheels are held parallel to the frame rails

Question 16

What are the 3 most common types of energy-absorbing devices used in suspension
systems?

Answer 16

1. leaf spring
2. rubber cushion
3. rubber air spring

Question 17

The energy-absorbing device of a suspension system is released when _________________

Answer 17

it rebounds.

Question 18

Solid-mount suspension systems are best suited to applications that ________________

Answer 18

operate on rugged terrain.

Question 19

Equalizer beams reduce the effect of shock loads to the vehicle frame by ____%

Answer 19

50%

Question 20

Axles are stabilized against braking and acceleration forces by _____________________

Answer 20

longitudinal torque
rods

Question 21

What is the function of transverse torque rods?

Answer 21

The function of transverse torque rods is to provide improved side-to-side stability by distributing side loads more evenly across the entire length of the axle.

Question 22

Progressive leaf springs provide a low spring rate when the vehicle is _______________ and a high spring rate _____________

Answer 22

Progressive leaf springs provide a low spring rate when the vehicle is unloaded and a high spring rate under load.

Question 23

Auxiliary springs help to support the vehicle when it is ________________

Answer 23

loaded

Question 24

_______________ accommodate changes in spring length as the suspension jounces and
rebounds.

Answer 24

Spring shackles

Question 25

What is the main function of a shock absorber?

Answer 25

The main function of a shock absorber is to dampen spring oscillation.

Question 26

What is the function of vertical drive pins on a rubber cushion type suspension?

Answer 26

The function of vertical drive pins on a rubber cushion type suspension is to allow the saddles to move up and down as the load cushions deflect, thus maintaining
alignment of the saddles with the frame rails.

Question 27

An advantage that air spring suspensions have over other suspension types is that they provide superior
________________

Answer 27

ride quality

Question 28

What is the function of the pressure protection valve in an air spring suspension?

Answer 28

ensures that a minimum safe pressure is maintained in the air reservoir for air brake operation if a leak occurs in the suspension air system

Question 29

When does the ride height control valve supply air to the air springs?

Answer 29

when additional load is added to the vehicle.

Question 30

What is the function of the two-way control valve and dump valves?

Answer 30

The function of the two-way control valve and dump valves is to allow the driver to exhaust the air springs so that the suspension will lower when connecting or disconnecting a trailer.