Deck 2: Principles and Theories of Operation

Question 1

Technician A says electrical circuits have an electrical pressure (force)that is used to move electrons through a circuit. Technician B says a lack of resistance in an electrical device (load)will prevent work being performed to the extent it was designed. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 1

C

Question 2

Technician A says that friction between the vehicles tires and the road is one factor in stopping the vehicle. Technician B says that a car with locked brakes stops in the shortest time possible. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 2

A

Question 3

Technician A says kinetic friction changes kinetic energy into thermal energy. Technician B says static friction holds the car in place when it is stopped. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Answer 3

C

Question 4

Technician A says the relationship of voltage, current, and resistance is summarized by a mathematical equation known as Ohm's law. Technician B says Ohm's law states that one ampere is required to push one volt through a resistance of one Ohm. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 5

Brake fade is being discussed. Technician A says a thin layer of gas between the pads or linings and the rotors could cause brake fading. Technician B says heat is the greatest cause of brake fade. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 6

Technician A hydraulic fluid can transmit motion and force because a fluid cannot be compressed. Technician B says mechanical advantage in a hydraulic system is proportional to the size of the input piston versus the output piston. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 7

All of the following are types of brake fade EXCEPT:

A)gas.
B)drum.
C)mechanical.
D)lining.

Question 8

Brake operational theories are being discussed. Technician A says an object at rest creates kinetic energy. Technician B says kinetic friction is created when the brakes are applied. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 9

Technician A says that inertia is best described as the resistance to a change in motion.   Technician B says that momentum is the force of continuing motion. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 10

In a sealed hydraulic system, brake fluid is pressurized to:

A)transmit force.
B)transmit pressure.
C)transmit movement
D)all of the above.

Question 11

Technician A says the energy used by the braking system is based on the kinetic energy, mass, weight, and speed of the vehicle and its braking system. Technician B says the amount of friction in a brake system depends on the pressure (force)exerted on the friction components and the surface area?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 12

Technician A says that mass is the measurement of gravity acting on an object. Technician B says that weight is the measurement of the number of molecules that make up an object. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 13

Brake friction materials are being discussed. Technician A says molding bits of metal into a brake lining produces an excellent friction material. Technician B says composite linings can be made from synthetic fibers bonded together. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 14

Technician A says reducing the coefficient of friction lowers the amount of force needed to move an object. Technician B says coefficient of friction is the relationship of tensile force to weight. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 15

Brake friction materials are being discussed. Technician A says semi-metallic materials are made from a mix of organic or synthetic fibers and metals molded together. Technician B says ceramic pads provide suitable life, provide good stopping, and reduce changes of fading, but they retain heat. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 16

Mass is being discussed. Technician A says that the mass of an object is equal to the weight of an object. Technician B says that mass is not the weight of the object but the amount of matter in that object. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 17

Brake systems are being discussed. Technician A says the service brakes may be drum or disc. Technician B says ABS becomes involved only if it senses one (or more)wheels about to lock up. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 18

Technician A says to calculate the coefficient of friction, measure the force required to slide an object over a surface and then divide it by the weight of the object. Technician B says the moving force that slides an object over a surface is tensile force. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 19

Technician A says the weight of a car is not distributed evenly on all four wheels even when the vehicle is standing still. Technician B says front brake systems are smaller than rear units. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 20

An electrical circuit using 12 volts and having 10 ohms of resistance would have a current of:

A)1.2 amperes.
B).2 ampere.
C)1 ampere.
D)12 amperes.

Question 21

Define tensile force, weight of the object, and how they are used to calculate the coefficient of friction.

Question 22

Define vacuum.

Question 23

If the output piston is smaller than the input piston, it exerts more force but travels a longer distance.

Question 24

Gas fade is the result of oil or grease getting onto the braking surface.

Question 25

Explain the use of static friction in a hydraulic brake system.

Question 26

Which of the following is true of perpetual energy?

A)It is everlasting.
B)There is no perpetual energy device today.
C)A machine or device cannot produce more energy than it consumes.
D)All of the above

Question 27

Describe the conversion of kinetic energy to thermal energy.

Question 28

Disc brakes require higher operating pressure than drum brakes.

Question 29

A true statement of hydraulic principles would NOT include which of the following facts?

A)Fluids cannot be compressed
B)Fluids can transmit motion
C)Fluids apply pressure to transmit and increase force.
D)Fluids all have the same viscosity

Question 30

Why must heat from braking be dissipated?

Question 31

Explain the use of kinetic friction in a hydraulic brake system.

Question 32

Using mathematics, explain how the 10 foot-pound force of a 1-square-inch piston can be increased twice using a 2-inch output piston.

Question 33

Define rolling resistance as it applies to vehicle operation.

Question 34

Explain inertia.

Question 35

Which of the following factors affect the coefficient of friction in a brake system?

A)The surface finish of both friction surfaces
B)The metal of the rotors and drums and the friction material of the pads and linings
C)Temperature
D)All of the above

Question 36

Explain the action of fluid trapped in a sealed system.

Question 37

The master cylinder is an apply piston.

Question 38

Mechanical fade is usually a result of overheated drums.

Question 39

Which of the following type of brake fade occurs when the friction material overheats to the point at which the coefficient of friction declines severely.

A)mechanical fade
B)lining fade
C)gas fade
D)fluid fade

Question 40

Kinetic energy is present when the vehicle is stopped with the parking brake applied.

Question 41

Technician A says a vernier caliper can be used to measure disc pad thickness. Technician B says a dial indicator may be used to measure pad thickness. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 42

Technician A says a self-powered test light is called a continuity tester and is used with the power off in the circuit being tested. Technician B says digital multimeters provide very precise voltage measurement. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 43

____________ is the electromotive force that causes current to flow.

Question 44

The effects of inertia and velocity illustrate why a high performance car needs a brake system with greater stopping power than an economy car with only modest performance.

Question 45

Technician A says common automotive metric fastener grades for automotive use are 9.8 and 10.9. Technician B says using an incorrect fastener can result in personal injury. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 46

Semimetallic or organic compounds have different coefficients of friction.

Question 47

When the driver applies the brakes, the vehicle-not the driver or the passengers-is being slowed. Without seat belts and air bags, the vehicle occupants tend to keep moving in the same direction and at the same speed of the vehicle as before the brakes were applied.

Question 48

Impact wrenches are being discussed. Technician A says they are most suitable for removing fasteners like wheel lug nuts or axle nuts. Technician B says most sockets are suitable for use with an impact wrench. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 49

Five of the most important characteristics of a brake friction material are:
1. The ability to resist fading when the brake system temperature ____________________.
2. The ability to resist fading when the parts get ____________________.
3. The ability to recover quickly from ____________________ or ____________________ fading.
4. The ability to wear ____________________ without causing wear to brake rotor or drum surfaces.
5. The ability to provide a _____________, _____________frictional contact with a rotor or drum.

Question 50

Repeated hard stops in a short period of time can severely overheat brake components and reduce braking effectiveness. This is called ____________________.

Question 51

Excessive amounts of heat generated during braking action increases the coefficient of friction and allows for shorter stopping distances.

Question 52

Line and hose fittings are being discussed. Technician A says always use a flare-nut (line)wrench to loosen a line fitting. Technician B says an open-end wrench is sufficient for fully tightening the fittings. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 53

The terms mass and ____________ can be used interchangeably.

Question 54

Newton's second law of motion states that " for every action there is an ____________________ and____________________ reaction".

Question 55

Kinetic energy increases ____________ with vehicle weight.

Question 56

Many power brake systems use ___________ to provide a power assist for the driver.

Question 57

Energy can be neither created nor can it be destroyed, however, it can be ____________________ from one form to another.

Question 58

Technician A says a digital storage oscilloscope is used to analyze electrical waveforms in minute detail. Technician B says scan tools allow the technician to interface with the vehicle computer network. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 59

._______ is the molecular density of an object.

Question 60

Vacuum is generally considered to be air pressure ____________________ than atmospheric pressure (14.7 PSI).

Question 61

The lines shown on the head of bolt 2 indicate:

A)it is a SAE grade 3.
B)it is rarely used.
C)it is aircraft quality.
D)it is an SAE grade 5.

Question 62

Technician A says all electrical tools, unless they are the double-insulated type, must be grounded. Technician B says that even a properly grounded tool could cause a shock if an easier path to ground is available to the electrical current. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 63

A series circuit has:

A)one electrical path.
B)two electrical paths.
C)one electrical path controlling multiple electrical paths.
D)two electrical paths controlling one electrical path.

Question 64

Technician A says that the prefix K means that the technician should multiply the reading by 1,000. Technician B says that the technician should multiply by .001. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A not B

Question 65

List the most common metric units in automotive service.

Question 66

Parallel circuits will always have each of the following characteristics EXCEPT:

A)equal voltage supply per path.
B)equal current flow per path.
C)multiple electrical paths.
D)equal or different resistance per path.

Question 67

What are brake lathes, and what are they used for?

Question 68

The best wrench to use when loosening a bleeder screw is a/an:

A)12 point socket
B)open end wrench
C)six point bleeder valve wrench
D)line wrench

Question 69

Technician A says that the most common use of a dial indicator is to measure the runout in a disc brake rotor. Technician B says that feeler gauges are used to measure disc brake rotor runout. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 70

List types of precision measuring tools.

Question 71

An electrical circuit using 12 volts and 5 amps of current would have a resistance of:

A)2.4 ohms
B).2 ohms
C)1 ohm
D)12 ohms

Question 72

Electrical theory is being discussed. Technician A says in a series circuit, the electrical have load devices are connected to form one current path to and from the power source. Technician B says in a parallel circuit, the electrical loads are connected to form more than one current path to and from the power source. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 73

Brake cleaning is being discussed. Technician A says brake dust can be removed with a blowgun if the area has been wetted down first. Technician B says a negative-pressure enclosure can be used to safely contain brake dust in the workplace. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 74

Explain what an outside micrometer or vernier caliper may be used for during brake repairs.

Question 75

A __________ scale is a fine auxillary scale that indicates fractional parts of a larger scale.

Question 76

Give an example of the type brake component measurement you would make using an outside micrometer.

Question 77

Which of the following statements is true? A. Celsius temperature for the freezing point of water is 0 degrees. B. The boiling point of water measured on the Fahrenheit scale is 212 degrees.

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 78

To measure voltage in an electronic circuit, a technician should use a(n):

A)analog multimeter.
B)LED testlight.
C)DMM.
D)self-powered testlight.

Question 79

Technician A says that a liter is slightly smaller in volume than a U.S. quart. Technician B says that 3.78 liters equal one U.S. gallon. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 80

What are the most common tubing tools?