Question 1

Electricity is caused by the flow of electrons from one atom to another.

Accepted Answer

This is correct. Electricity is the flow of electrons from one atom to another. This movement creates an electric current that can be harnessed for power.

Question 2

Many automotive components, such as alternators, ignition coils, starter solenoids, and magnetic pulse generators operate using principles of _____.

Accepted Answer

These components operate using principles of electromagnetism, which involves the interaction between electric currents and magnetic fields.

Question 3

Technician A says rheostats have three connections, one at each end of the resistance and one connection to a sliding contact with the resistor. Technician B says potentiometers have two connections, one at the power end of the resistance and one connected to a sliding contact with the resistor. Who is correct?

Accepted Answer

D

Question 4

A(n) _____ is an electric switch which allows a small amount of current to control a much larger one.

Accepted Answer

A relay is an electric switch that allows a small electrical signal to control a larger electrical signal. It is commonly used in industrial and automotive applications to control high power devices with a low power signal.

Question 5

Technician A says a diode allows current to flow in only one direction. Technician B says transistors are semiconductor switching devices. Who is correct?

Accepted Answer

Both technicians are correct. A diode is a semiconductor device that allows current to flow in only one direction while a transistor is a semiconductor device that can amplify or switch electronic signals, making it a switching device.

Question 6

Technician A says magnetism is a source of electrical energy in an automobile. Technician B says a chemical reaction is a source of electrical energy in an automobile. Who is correct?

Accepted Answer

Both technicians are correct. Magnetism is utilized in the alternator to generate electrical energy as the engine runs, while a chemical reaction in the battery provides electrical energy for starting the vehicle and powering accessories when the engine is off.

Question 7

A semiconductor can function as either a conductor or an insulator.

Accepted Answer

A semiconductor has properties of both a conductor and an insulator, as its conductivity can be controlled by varying factors such as temperature and impurities added to the material.

Question 8

Ohm's law is the basic law of electricity.

Accepted Answer

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. This is the fundamental law of electricity.

Question 9

A computer makes decisions based on information from its sensors.

Accepted Answer

A computer can make decisions based on information received from its sensors, such as input from a keyboard or mouse, sensors on a robot, or data from environmental sensors like temperature or humidity monitors.

Question 10

The resistance to current flow produces _____, which can be measured to determine the amount of resistance.

Accepted Answer

The resistance to current flow produces heat, which is the result of the collisions between electrons and atoms in the conducting material. This heat can be measured to determine the amount of resistance using techniques such as thermography or infrared imaging. Power, force, and electrical shock are not direct products of resistance, but may be related to it in certain contexts.

Question 11

Technician A says direct current (DC) flows in two directions. Technician B says alternating current (AC) flows in two directions. Who is correct?

Accepted Answer

Alternating current (AC) flows in two directions, while direct current (DC) flows in only one direction.

Question 12

In the center of every atom is the electron.

Accepted Answer

In the center of every atom is the nucleus, which contains protons and neutrons. Electrons orbit around the nucleus.

Question 13

One ampere is equivalent to 10 billion electrons flowing past a given point in one second.

Accepted Answer

One ampere is equivalent to approximately 6.242 x 10^18 electrons flowing past a given point in one second.

Question 14

Most automobile circuits work on AC, whereas the current in homes and buildings is DC.

Accepted Answer

Most automobile circuits work on DC, whereas the current in homes and buildings is AC.

Question 15

Batteries have two terminals, a positive and a negative.

Accepted Answer

Batteries have a positive and a negative terminal, which are essential for their function as a source of electrical energy.

Question 16

The clutch safety switch insures that the vehicle will not start in gear.

Accepted Answer

The clutch safety switch is designed to prevent the vehicle from starting when the clutch pedal is not depressed. It ensures that the vehicle can only be started in neutral or with the clutch pedal fully depressed, preventing the possibility of the vehicle starting in gear and potentially causing an accident.

Question 17

While discussing the behavior of electricity, Technician A says that the amount of current which flows in a circuit is determined by the resistance in the circuit. Technician B says that as resistance goes up, the current goes down. Who is correct?

Accepted Answer

Both technicians are correct. According to Ohm's Law, current (I) is equal to voltage (V) divided by resistance (R), or I = V/R. Therefore, as resistance goes up, the current must go down to maintain the same voltage in the circuit. So, both the amount of current and the resistance in the circuit are interdependent.

Question 18

An electrical circuit is considered _____ when there is a path connecting the positive and negative terminals of the electrical power source.

Accepted Answer

A complete circuit is when there is a continuous path for the flow of electricity from the positive terminal of the power source to the negative terminal. An open circuit is when there is a gap or break in the path, preventing the flow of electricity. Direct and live are not accurate descriptions of a circuit's completeness.

Question 19

Copper, silver, and aluminum are good insulators of electricity.

Accepted Answer

Copper, silver, and aluminum are actually conductors of electricity, not insulators. Insulators include materials such as rubber and plastic.

Question 20

The main source of electrical power for a vehicle is stored in the _____.

Accepted Answer

The battery is the main source of electrical power for a vehicle as it provides power to start the engine and also powers the various electrical and electronic components in the vehicle. The alternator recharges the battery while the engine is running, but the battery is still the primary source of power. The starter is used to start the engine, but it does not provide ongoing electrical power. The ECM (Engine Control Module) is responsible for controlling various engine functions and does not provide power to other components.

Quiz 10: Drivetrain Electrical and Electronic Systems Servicing Drivetrain Electrical Systems