Free Practice Quiz Question List

5 Electrical Measurement and Safety Online Quiz Questions

Use this free practice quiz with 20 questions to review 5 Electrical Measurement and Safety, test your knowledge, and prepare for your next test or exam.

20 questions

Fill in the blank

1 point

A voltmeter reading describes the electrical between the two points touched by its probes.

Choose one

1 point

You need to measure the voltage across a component while the circuit is operating. Which connection should you use?

A
Connect the meter in parallel across the component.
B
Open the circuit and insert the meter in series.
C
Connect the meter across the voltage source using the current input.
D
Disconnect the component and measure it with the continuity function.

True or false

1 point

A non-contact voltage tester should not be relied on by itself to prove that a circuit is de-energized.

A
True
B
False

Choose one

1 point

Before using a DMM to measure resistance in a circuit that may contain capacitors, which preparation is appropriate?

A
Leave the circuit powered and select the highest resistance range.
B
Disconnect power, verify it is off, and discharge capacitors according to safe procedures.
C
Switch off power but skip verification and test immediately.
D
Use the resistance function first, then disconnect power if the reading is unstable.

Choose one

1 point

Why should you never connect a DMM in current-measurement mode directly across a voltage source?

A
It will always measure voltage instead of current.
B
It will make the source's voltage increase.
C
It can create a short circuit, blow the meter's fuse, or cause injury.
D
It will safely measure current because the meter automatically limits it.

Choose all

1 point

Which practices help you obtain and interpret a DMM measurement correctly? Select all that apply.

A
Select the correct quantity, AC/DC mode, and range.
B
Read the displayed unit and prefix, such as mA or kΩ.
C
Keep probe tips steady and avoid bridging adjacent terminals.
D
Assume autoranging selects the correct measurement function automatically.
E
Treat a meter's maximum voltage rating as proof that it is suitable for every installation.

Fill in the blank

1 point

When a resistance test is performed on an open path, the DMM may display or a similar indication.

True or false

1 point

A continuity beeper confirms that the entire circuit is functioning correctly, not merely that there is a sufficiently low-resistance path between the probes.

A
True
B
False

Choose all

1 point

When checking a resistor, which statements are valid? Select all that apply.

A
Compare the measured value with the resistor's marked value and tolerance.
B
Recognize that other paths through connected components may affect an in-circuit reading.
C
If surrounding circuitry affects the result, isolate one lead before measuring.
D
Assume every in-circuit resistance reading is the resistor's exact value.
E
Use the resistance function while the circuit is energized to avoid changing its connections.

Choose one

1 point

You want to check current in a typical two-wire cable with a clamp meter. How should you position the clamp to avoid a misleading reading?

A
Clamp around a single conductor, usually without opening the circuit.
B
Clamp around both conductors of a typical two-wire cable to add their currents.
C
Insert the clamp meter in series by opening the circuit.
D
Clamp around the component whose resistance you want to measure.

Choose one

1 point

You are measuring an unknown voltage with a non-autoranging meter. Which range-selection approach is recommended?

A
Start on the lowest range so that small values are easier to see.
B
Start on a range higher than the expected voltage.
C
Select the resistance function and increase the range if needed.
D
Use any range because the meter's maximum voltage rating guarantees the reading.

Open ended

1 point

A battery's terminal voltage is near its expected value. What does this reading establish, and what does it not establish about the battery?

Choose one

1 point

On a typical digital multimeter, which jack normally holds the black test lead?

A
VΩ
B
COM
C
A
D
mA

Choose one

1 point

To measure current in a typical two-wire cable with a clamp meter, where should you place the clamp?

A
Clamp around a single conductor
B
Clamp around both conductors of a two-wire cable
C
Connect the clamp meter across the power source
D
Insert the clamp meter in series by opening the circuit

Choose one

1 point

You need to check the voltage across a component while its circuit is operating normally. How should a voltmeter be connected?

A
In series with the component, with the circuit opened
B
Across the power source only, regardless of the points being checked
C
In parallel across the component or points being checked
D
Across the component after disconnecting circuit power

True or false

1 point

True or false: If a non-contact voltage tester does not indicate voltage near a conductor, that result alone proves the circuit is de-energized.

A
True
B
False

Written response

1 point

A meter displays a current of 0.25 A. What is the equivalent value in milliamps?

Written response

1 point

While measuring DC voltage, a DMM displays a negative sign where a positive reading was expected. What does this usually indicate about the probes?

Written response

1 point

You are measuring a very small resistance, and the resistance of the probes and leads could affect the result. What meter function can help compensate for that resistance, if available and suitable? Enter the function name.

Written response

1 point

When deciding whether a meter is appropriate for an electrical installation, what type of rating must you check in addition to its maximum voltage rating? Enter the rating name.