Question 1

All of the following are types of brake fade EXCEPT ________.

Accepted Answer

A)  Mechanical fade
B)  Rotor fade
C)  Lining fade
D)  Gas fade B

Question 2

What factors determine the friction coefficient?

Accepted Answer

A)  Friction material, surface area
B)  Surface area, friction material
C)  Friction material, surface finish
D)  Surface area, surface thickness C

Question 3

Work is the transfer of energy from one physical system to another.

Accepted Answer

A) True 
 B)False  True

Question 4

It takes 50 pounds of force to move a 100 pound block of wood across the floor. The coefficient of friction is ________.

Accepted Answer

A)  0.5
B)  1.0
C)  1.5
D)  2.0

Question 5

A 3000 pound vehicle is calculated to have a kinetic energy of 90,000 ft-lb at 28 mph. If the speed of the vehicle remains the same and the weight is doubled to 6000 pounds, what will happen to the calculated kinetic energy?

Accepted Answer

A)  It will increase by the square (x 4) , to 360,000 ft-lb.
B)  It will remain the same.
C)  It will increase proportionally (x 2) , to 180,000 ft-lb.
D)  None of these are correct.

Question 6

Technician A says that the front brakes do most of the braking because the front brakes are larger. Technician B says that due to weight transfer, most of the braking force needs to be done by the front brakes. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 7

Mechanical advantage is the ratio of force applied to the energy exerted.

Accepted Answer

A) True 
 B)False

Question 8

The front brakes on a vehicle do more work than do the rear brakes. Technician A says that this is because the front wheel cylinders are closer to the master cylinder than are the rear wheel cylinders. Technician B says that this is because the weight of a vehicle shifts to the front during a stop. Which technician is correct?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor B

Question 9

Rear brakes do less work during hard braking than the front brakes because ________.

Accepted Answer

A)  The rear brakes are larger
B)  The vehicle weight transfers forward
C)  The rear tires have less traction
D)  Both B and C are correct

Question 10

The friction between two surfaces is affected by all of these EXCEPT ________.

Accepted Answer

A)  Surface finish
B)  Frictional material
C)  Speed difference between the two surfaces
D)  Heat

Question 11

A typical hanging brake pedal is a ________.

Accepted Answer

A)  Fourth-class lever
B)  Third-class lever
C)  First-class lever
D)  Second-class lever

Question 12

Energy is a measure of work.

Accepted Answer

A) True 
 B)False

Question 13

The brake pedal assembly uses a mechanical lever to ________.

Accepted Answer

A)  Increase the distance the brake pedal needs to be depressed by the driver
B)  Decrease the driver's force on the brake pedal applied to the master cylinder
C)  Allow for clearance between the brake pedal and the floor when the brakes are applied
D)  Increase the driver's force on the brake pedal applied to the master cylinder

Question 14

If the weight of a car doubles, its kinetic energy ________.

Accepted Answer

A)  Doubles
B)  Triples
C)  Is cut by one-quarter
D)  Is cut by half

Question 15

Leverage is a mechanical principle used to increase force.

Accepted Answer

A) True 
 B)False

Question 16

All of the following are correct statements about braking EXCEPT ________.

Accepted Answer

A)  Kinetic energy of a vehicle doubles when the speed doubles
B)  Kinetic energy must be absorbed by the braking system
C)  If the vehicle weight is doubled, the kinetic energy of a moving vehicle is doubled
D)  The heavier the vehicle, the greater the kinetic energy when moving

Question 17

Maximum deceleration rates for a typical passenger car or light truck is ________.

Accepted Answer

A)  200 to 250 ft/sec2 
B)  16 to 32 ft/sec2 
C)  1 to 3 ft/sec
D)  5 to 10 ft/sec

Question 18

A body in motion tends to remain in motion in a straight line unless acted upon by an outside force.

Accepted Answer

A) True 
 B)False

Question 19

The static friction coefficient is always higher than the kinetic friction coefficient.

Accepted Answer

A) True 
 B)False

Question 20

Weight transfer during braking is caused by ________.

Accepted Answer

A)  Weight bias
B)  Inertia
C)  Friction
D)  Brake bias

Exam 93: Braking System Principles

All of the following are types of brake fade EXCEPT ________.

What factors determine the friction coefficient?

Work is the transfer of energy from one physical system to another.

It takes 50 pounds of force to move a 100 pound block of wood across the floor. The coefficient of friction is ________.

A 3000 pound vehicle is calculated to have a kinetic energy of 90,000 ft-lb at 28 mph. If the speed of the vehicle remains the same and the weight is doubled to 6000 pounds, what will happen to the calculated kinetic energy?

Technician A says that the front brakes do most of the braking because the front brakes are larger. Technician B says that due to weight transfer, most of the braking force needs to be done by the front brakes. Which technician is correct?

Mechanical advantage is the ratio of force applied to the energy exerted.

Rear brakes do less work during hard braking than the front brakes because ________.

The friction between two surfaces is affected by all of these EXCEPT ________.

A typical hanging brake pedal is a ________.

Energy is a measure of work.

The brake pedal assembly uses a mechanical lever to ________.

If the weight of a car doubles, its kinetic energy ________.

Leverage is a mechanical principle used to increase force.

All of the following are correct statements about braking EXCEPT ________.

Maximum deceleration rates for a typical passenger car or light truck is ________.

A body in motion tends to remain in motion in a straight line unless acted upon by an outside force.

The static friction coefficient is always higher than the kinetic friction coefficient.

Weight transfer during braking is caused by ________.