Question 1

The greatest advantage of a digital storage oscilloscope (DSO) is the ____ at which it samples electrical signals.

Accepted Answer

The greatest advantage of a digital storage oscilloscope (DSO) is its speed at which it samples electrical signals. It can capture and store millions of samples per second, allowing for precise analysis of high-frequency signals.

Question 2

The term ____ means a circle and is the path of electron flow consisting of the voltage source, conductors, load component, and return path to the voltage source.

Accepted Answer

A circuit is defined as a closed path in which electrons can flow. It includes a voltage source (such as a battery), conductors (wires), load components (such as light bulbs or resistors), and a return path to the voltage source. Therefore, choice B is the correct answer.

Question 3

Whenever the brake pedal is pressed the left-rear and right-rear taillights, and the left rear and the right-rear brake light of a vehicle illuminate dimly. Technician A says the brake lights may have a poor ground connection. Technician B says the brake light switch may have excessive resistance. Who is correct?

Accepted Answer

A poor ground connection can cause the brake lights to illuminate dimly because it restricts the flow of electricity needed for full brightness.

Question 4

Technician A says to test fuses you could use a voltmeter or a test light. Technician B says a voltmeter and a test light are connected in parallel. Who is correct?

Accepted Answer

Technician A is correct that both a voltmeter and a test light can be used to test fuses. Technician B is incorrect that a voltmeter and a test light are connected in parallel as they are two different tools that can be used independently to test circuits.

Question 5

A(n) ____ is the most common means of providing control of electrical current flow to an accessory.

Accepted Answer

A switch is specifically designed to provide control of electrical current flow. Outlets are used for connecting electrical devices, but do not necessarily control the flow of current. Poles and throws are not common terms used in relation to electrical control.

Question 6

Technician A s ays a shorted circuit can generate excessive heat. Technician B says a shorted circuit will cause the circuit protection device to open. Who is correct?

Accepted Answer

Both statements by Technician A and Technician B are correct. A shorted circuit can indeed generate excessive heat due to the high current flow, and it will typically cause the circuit protection device (such as a fuse or circuit breaker) to open in order to protect the circuit from damage.

Question 7

A diode that allows current flow in both directions is ____.

Accepted Answer

A diode that allows current flow in both directions is considered to be shorted. Normally, diodes are designed to allow current to flow in only one direction, acting as a one-way valve for electrical current. If a diode is shorted, it fails to block current in the reverse direction, thus allowing current to flow freely in both directions.

Question 8

A(n) ____ is designed to turn off the system whenever excessive current or an overload occurs.

Accepted Answer

A protection device is designed to turn off the system whenever excessive current or an overload occurs. Gauss gauge is used to measure magnetic fields, solenoid is a coil of wire used to generate a magnetic field, and oscilloscope is used to measure and display electronic signals.

Question 9

The circuit breaker that protects a power window circuit opens whenever the window is lowered. Technician A says the internal resistance of the motor is too high. Technician B says the window regulator may be sticking. Who is correct?

Accepted Answer

If the circuit breaker opens whenever the window is lowered, it suggests that there is an overload or high current draw when the window is moving. Technician B's explanation about the window regulator sticking is more likely to cause this issue than Technician A's explanation about the motor's internal resistance. Therefore, Technician B is correct.

Question 10

____ is the electrical pressure that causes electrons to move provided there is a complete path for them to do so.

Accepted Answer

Voltage is the electrical pressure, or potential difference, that causes electrons to move in a circuit. It is measured in volts and is equivalent to the amount of work per unit charge required to move electrons between two points in a circuit.

Question 11

How are fuses rated?

Accepted Answer

Fuses are rated by current capacity, which means they are designed to break or “blow” at a specific current level to protect the circuit from damage caused by overcurrent. The current rating is usually marked on the fuse body in amperes.

Question 12

Which of the following is true about a clamping diode?

Accepted Answer

A clamping diode is used to protect some solid-state circuitry by limiting the voltage spikes that may occur in the circuit. It can be tested with an ohmmeter or a self-powered test light. While it may not be commonly used in modern vehicles, it is still found in some electronic systems.

Question 13

Which of the following is true of the LED?

Accepted Answer

LEDs can produce various colors of light, including red, green, and yellow. Option B is incorrect as LEDs contain both an anode and a cathode. Option C is incorrect as LEDs do not require an external light source as they themselves produce light.

Question 14

A ____ is a special type of configuration usually consisting of two transistors fabricated on the same chip or mounted in the same package.

Accepted Answer

The Darlington pair is a special configuration consisting of two transistors that are commonly used in applications that require high current gain. They are usually fabricated on the same chip or mounted in the same package, and they operate as a single transistor with a very high current gain.

Question 15

Technician A says you may replace a fusible link with a larger gauge wire. Technician B says a burned-out fuse indicates a larger-rated fuse should be used. Who is correct?

Accepted Answer

Neither technician is correct. A fusible link should never be replaced with a larger gauge wire as this can create a safety hazard. It is never advisable to use a larger-rated fuse to replace a burned-out fuse, as this can cause damage to the circuit and prolong the problem. Both of these actions can create electrical problems and even become a fire hazard.

Question 16

Which of the following is NOT true of forward-bias in a diode?

Accepted Answer

In forward-bias, the positive voltage applied to the P-material repels the holes in the P-material and attracts the free electrons from the N-material. The electrons move across the junction and combine with the holes in the P-material. This creates a depletion region around the junction, which becomes narrower as the forward bias voltage increases. Therefore, negatively charged holes are not left behind in the N-material in forward-bias.

Question 17

A(n) ____ resistor has two or more fixed resistor values.

Accepted Answer

A stepped resistor has two or more fixed resistor values that can be selected using a switch or jumper. A dual resistor, on the other hand, typically refers to a single component that contains two separate resistor values. Variable resistors allow for adjustable resistance, while inductive resistors are specifically designed to have inductance properties in addition to resistance.

Question 18

A(n) ____ is a device that uses low current to control a high-current circuit.

Accepted Answer

A relay is a device that uses a small electrical current to control a higher electrical current. It works by using an electromagnet to open and close a switch in another circuit. This allows a low-power circuit to control a high-power circuit, making relays very useful in a variety of applications.

Question 19

A ____ is a conductor with a special heat-resistant insulation.

Accepted Answer

A fusible link is a type of conductor designed with special heat-resistant insulation, used in safety devices to prevent overheating and fires by melting at a specific temperature, thus breaking the circuit.

Question 20

To use a transistor as a simple solid-state relay, what conditions must occur?

Accepted Answer

When the emitter-base junction is forward biased and the collector-base junction is reverse biased, the transistor is in cutoff mode (i.e., it doesn't conduct). When the emitter-base junction is reverse biased and the collector-base junction is forward biased, the transistor is in saturation mode (i.e., it conducts fully). By controlling the biasing of these two junctions, we can use a transistor as a solid-state relay. In this case, we want the transistor to act like a switch, so we want it to be either fully conducting (on) or fully cutoff (off). Therefore, we need to bias the emitter-base junction forward and the collector-base junction reverse to achieve this result.

Quiz 3: Electrical and Electronic Componentsbasic Electrical Troubleshooting and Service