Question 1

A technician is testing a circuit that uses a ground-controlled relay to provide power to the circuit load. With the relay installed in its socket, the control terminal of the relay is grounded by a jumper wire; nothing happens. Technician A says check the coil input terminal for voltage. Technician B says connect a jumper wire between battery negative and the output terminal of the relay to check if the load is the problem. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Checking the coil input terminal for voltage is a logical step to ensure that the relay is receiving power to activate.

Question 2

The voltage specification for a wheel speed sensor is 3.5 to 6.0 VAC RMS ± 0.5/20 MPH. What does RMS stand for? ____________________

Accepted Answer

The answer of The voltage specification for a wheel speed...

Question 3

The wiring harness for the SIR [air bag] circuit has a _____ harness cover.
A) red
B) orange
C) day glow green
D) yellow

Accepted Answer

The wiring harness for the Supplemental Inflatable Restraint (SIR) system, which includes airbags, is typically covered with a yellow harness cover to indicate caution and ensure easy identification for safety purposes.

Question 4

____________________ solder is used to repair electrical wiring.

Accepted Answer

The answer of ____________________ solder is used to repair electrical...

Question 5

Technician A uses heat shrink tubing to insulate and seal soldered wire connections. Technician B wraps the soldered connection with electrical tape. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

The answer of Technician A uses heat shrink tubing to...

Question 6

A conventional ammeter is always connected in ____________________ with the circuit.

Accepted Answer

The answer of A conventional ammeter is always connected in...

Question 7

A voltmeter is connected in ____________________ with the circuit.

Accepted Answer

The answer of A voltmeter is connected in ____________________ with...

Question 8

The most common way to check a variable resistor is with a(n) ____________________.

Accepted Answer

The answer of The most common way to check a...

Question 9

Duty cycle is measured in ____________________.

Accepted Answer

The answer of Duty cycle is measured in ____________________....

Question 10

Technician A says a circuit breaker can be reset after the problem that tripped the circuit breaker is fixed by disconnecting the power to the circuit breaker for a few seconds. Technician B says the circuit breaker can be reset by pressing the reset button on the breaker. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Circuit breakers can often be reset by either disconnecting the power for a brief period or by pressing a reset button, depending on the design of the breaker. Both methods are commonly used for different types of circuit breakers.

Question 11

The number of cycles per second is called ____________________.

Accepted Answer

The answer of The number of cycles per second is...

Question 12

All the following information about the vehicle's wiring can be found in the electrical schematics with the exception of _____.
A) wire color
B) wire size
C) connector terminal designation
D) component location on vehicle

Accepted Answer

Electrical schematics typically include wire color, wire size, and connector terminal designation, but they do not usually provide the physical location of components on the vehicle.

Question 13

A beeping noise coming from the DMM when the function selector is set to ohms indicates that the circuit has ____________________.

Accepted Answer

The answer of A beeping noise coming from the DMM...

Question 14

An electrical ____________________ is a diagram used to troubleshoot a circuit.

Accepted Answer

The answer of An electrical ____________________ is a diagram used...

Question 15

A technician is diagnosing the cause of an insufficient heat problem. He notices the fan is working but not providing much air flow. He disconnects the fan power feed wire and connects the fan to the battery using a fused jumper wire. The specification for the fan motor is 16 amps. His ammeter shows 26 amps when the fan is jumped directly to the battery. What could be the problem?
A) bad fan motor ground
B) high resistance in the fan motor wiring
C) shorted wiring in the fan motor
D) all answers are correct

Accepted Answer

The high current draw (26 amps) compared to the specification (16 amps) suggests that there is a short in the fan motor, causing it to draw more current than it should.

Question 16

Technician A says dielectric grease is used on wire terminals and connectors to prevent corrosion. Technician B says dielectric grease reduces the resistance between the terminals. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Dielectric grease is used on wire terminals and connectors to prevent corrosion but it does not reduce the resistance between terminals. In fact, it is an insulator and is designed to inhibit current flow.

Question 17

A potentiometer [type of variable resistor] can be tested with all the following tools EXCEPT:
A) test light
B) voltmeter
C) ohmmeter
D) digital lab scope [DSO]

Accepted Answer

A test light, designed to check for the presence of voltage, is not suitable for testing a potentiometer, which requires measuring resistance or voltage variation across its terminals. Voltmeters, ohmmeters, and digital lab scopes (DSOs) can all be used to measure these properties accurately.

Question 18

A voltage drop test is performed to find unwanted ____________________.

Accepted Answer

The answer of A voltage drop test is performed to...

Question 19

Technician A uses the electrical schematic diagram to trace the flow of current through all the switches, wires, connectors, circuit protection devices, and grounds related to the problem before he begins testing. Technician B uses the schematic diagram to locate exactly where on the vehicle all of the circuit components are located. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Accepted Answer

Technician A is correct because the primary purpose of an electrical schematic is to trace the flow of current through the circuit components, which helps in diagnosing electrical issues. Technician B's approach is incorrect because schematic diagrams do not provide physical locations of components on the vehicle.

Question 20

The best method for testing wires and electrical connections is _____.
A) ohmmeter test
B) voltage drop test
C) inductive ammeter
D) infrared pyrometer

Accepted Answer

The voltage drop test is the best method for testing wires and electrical connections as it measures the actual voltage loss across a connection, indicating resistance and potential issues.

Quiz 16: General Electrical System Diagnostics and Service

The voltage specification for a wheel speed sensor is 3.5 to 6.0 VAC RMS ± 0.5/20 MPH. What does RMS stand for? ____________________

The wiring harness for the SIR [air bag] circuit has a _____ harness cover.

____________________ solder is used to repair electrical wiring.

Technician A uses heat shrink tubing to insulate and seal soldered wire connections. Technician B wraps the soldered connection with electrical tape. Who is correct?

A conventional ammeter is always connected in ____________________ with the circuit.

A voltmeter is connected in ____________________ with the circuit.

The most common way to check a variable resistor is with a(n) ____________________.

Duty cycle is measured in ____________________.

Technician A says a circuit breaker can be reset after the problem that tripped the circuit breaker is fixed by disconnecting the power to the circuit breaker for a few seconds. Technician B says the circuit breaker can be reset by pressing the reset button on the breaker. Who is correct?

The number of cycles per second is called ____________________.

All the following information about the vehicle's wiring can be found in the electrical schematics with the exception of _____.

A beeping noise coming from the DMM when the function selector is set to ohms indicates that the circuit has ____________________.

An electrical ____________________ is a diagram used to troubleshoot a circuit.

Technician A says dielectric grease is used on wire terminals and connectors to prevent corrosion. Technician B says dielectric grease reduces the resistance between the terminals. Who is correct?

A potentiometer [type of variable resistor] can be tested with all the following tools EXCEPT:

A voltage drop test is performed to find unwanted ____________________.

The best method for testing wires and electrical connections is _____.