Electrical Measurements: Master Electrical Test Equipment

Question 1

Which device measures electrical current?

Accepted Answer

Ammeter

Answer

Voltmeter

Answer

Ohmmeter

Question 2

In which unit is voltage measured?

Accepted Answer

Volts

Answer

Amperes

Answer

Ohms

Question 3

Which circuit type permits current flow in a single direction?

Accepted Answer

DC circuit

Answer

Series circuit

Answer

Parallel circuit

Question 4

What is the primary function of a multimeter in electrical maintenance?

Accepted Answer

Measuring voltage, current, and resistance

Answer

Troubleshooting electrical faults

Answer

Calibrating electrical equipment

Question 5

How do you calculate electrical resistance?

Accepted Answer

Voltage divided by Current

Answer

Current multiplied by Voltage

Answer

Current divided by Voltage

Question 6

What is the SI unit of electrical current?

Accepted Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Answer

Watt (W)

Question 7

Which tool is specifically designed to measure electrical voltage?

Accepted Answer

Voltmeter

Answer

Ammeter

Answer

Ohmmeter

Answer

Multimeter

Question 8

What is the primary purpose of a fuse in an electrical circuit?

Accepted Answer

To protect the circuit from excessive current (overcurrent protection)

Answer

To regulate voltage levels

Answer

To limit the flow of current

Answer

To isolate faulty components

Question 9

Which of the following materials is NOT commonly used for electrical insulation?

Accepted Answer

Wood

Answer

Rubber

Answer

Plastic

Answer

Ceramic

Question 10

Which law describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit?

Accepted Answer

Ohm's Law (V = IR)

Answer

Kirchhoff's Voltage Law

Answer

Kirchhoff's Current Law

Answer

Ampere's Law

Question 11

What is the primary function of a capacitor in an electrical circuit?

Accepted Answer

To store electrical energy

Answer

To block the flow of direct current (DC)

Answer

To regulate voltage levels

Answer

To reduce electrical noise

Question 12

What is the key difference between alternating current (AC) and direct current (DC) electrical circuits?

Accepted Answer

AC current periodically reverses its direction, while DC current flows continuously in one direction

Answer

AC current flows in one direction, while DC current flows in both directions

Answer

AC current is safer than DC current

Answer

AC current is used in homes, while DC current is used in vehicles

Question 13

What formula is used to calculate electrical power?

Accepted Answer

Voltage x Current

Answer

Voltage x Time

Answer

Current x Resistance

Answer

Resistance x Time

Question 14

Which electrical unit measures potential difference?

Accepted Answer

Volt

Answer

Ampere

Answer

Ohm

Answer

Watt

Question 15

What instrument is used to measure current flow in a circuit?

Accepted Answer

Ammeter

Answer

Voltmeter

Answer

Ohmmeter

Answer

Multimeter

Question 16

What is the purpose of the shunt resistor in an ammeter?

Accepted Answer

Extend the current measurement range

Answer

Reduce the current measurement range

Answer

Measure high voltages

Answer

Protect the meter from overloads

Question 17

Which is NOT a type of electrical multimeter?

Accepted Answer

Oscilloscope

Answer

Analog

Answer

Digital

Answer

Clamp-on

Question 18

What is the primary function of a continuity tester?

Accepted Answer

Detect open or closed circuits

Answer

Measure voltage

Answer

Measure current

Answer

Measure resistance

Question 19

What is the purpose of a ground fault circuit interrupter (GFCI)?

Accepted Answer

Prevent electrical shocks

Answer

Protect against overloads

Answer

Measure ground resistance

Answer

Isolate faulty circuits

Question 20

Which is a common use for an insulation resistance tester?

Accepted Answer

Test the insulation of electrical cables

Answer

Measure the voltage of a battery

Answer

Check the continuity of a circuit

Answer

Troubleshoot electrical equipment

Question 21

Which of the following devices allows for the measurement of multiple electrical quantities?

Accepted Answer

Multimeter

Answer

Voltmeter

Answer

Ammeter

Answer

Ohmmeter

Question 22

The letter used to represent the unit of electrical voltage is:

Accepted Answer

V

Answer

A

Answer

R

Answer

W

Question 23

The resistance of a conductor with a 10-volt potential difference and a current of 2 amperes is:

Accepted Answer

2 ohms

Answer

5 ohms

Answer

10 ohms

Answer

20 ohms

Question 24

The primary purpose of a fuse in an electrical circuit is to:

Accepted Answer

Protect against overcurrent

Answer

Prevent overvoltage

Answer

Isolate faulty components

Answer

Regulate voltage

Question 25

The primary difference between a digital multimeter and an analog multimeter is:

Accepted Answer

Digital multimeters display readings in numerical format, while analog multimeters use a needle to indicate values.

Answer

Digital multimeters are generally less accurate than analog multimeters.

Answer

Digital multimeters have a higher cost compared to analog multimeters.

Answer

Digital multimeters measure a narrower range of values compared to analog multimeters.

Question 26

For safety, which action should you avoid when using electrical test equipment?

Accepted Answer

Touching both test leads together

Answer

Wearing proper safety gear

Answer

Using equipment in good condition

Answer

Avoiding live circuits

Question 27

Which instrument is used specifically for measuring electrical current?

Accepted Answer

Ammeter

Answer

Multimeter

Answer

Voltmeter

Answer

Megohmmeter

Question 28

What is the standard international unit for measuring electrical resistance?

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Answer

Watt

Question 29

In an ammeter, what is the function of a shunt resistor?

Accepted Answer

To extend the current measurement range of the meter.

Answer

To shield the meter from excessive current.

Answer

To provide a reference voltage for the meter.

Answer

To calibrate the meter prior to use.

Question 30

Which of the following devices is NOT used for electrical insulation testing?

Accepted Answer

Clamp meter

Answer

Megohmmeter

Answer

Ohmmeter

Answer

Hi-Pot tester

Question 31

What is a typical application of a clamp meter?

Accepted Answer

Non-invasive measurement of AC current.

Answer

Continuity testing of circuits.

Answer

Determining the insulation resistance of cables.

Answer

Calibration of other electrical test equipment.

Question 32

What is the purpose of a Kelvin probe in electrical measurements?

Accepted Answer

To eliminate the impact of test lead resistance.

Answer

To enhance the sensitivity of the measurement.

Answer

To protect the measuring device from damage.

Answer

To establish a reference voltage for the measurement.

Question 33

Which of the following is NOT a fundamental electrical quantity?

Accepted Answer

Time

Answer

Voltage

Answer

Current

Answer

Resistance

Question 34

What SI unit is used to measure electrical current?

Accepted Answer

Ampere

Answer

Ohm

Answer

Volt

Answer

Watt

Question 35

Which device is primarily used to measure voltage?

Accepted Answer

Voltmeter

Answer

Ammeter

Answer

Ohmmeter

Answer

Multimeter

Question 36

What is the purpose of a shunt resistor in an ammeter?

Accepted Answer

To extend the current measurement range

Answer

To decrease the current measurement range

Answer

To protect the meter from overloads

Answer

To improve accuracy

Question 37

What is the primary function of a varistor in an electrical circuit?

Accepted Answer

To protect against voltage surges

Answer

To regulate current flow

Answer

To store electrical energy

Answer

To filter out noise

Question 38

When troubleshooting an electrical circuit, which measurement is generally taken first?

Accepted Answer

Voltage

Answer

Current

Answer

Resistance

Answer

Phase angle

Question 39

Which of the following is a basic electrical quantity?

Accepted Answer

Current

Answer

Energy

Answer

Time

Answer

Power

Question 40

What is the standard unit of voltage in the International System of Units (SI)?

Accepted Answer

Volt

Answer

Watt

Answer

Ampere

Answer

Ohm

Question 41

Which instrument is specifically designed to measure voltage?

Accepted Answer

Voltmeter

Answer

Ammeter

Answer

Multimeter

Answer

Ohmmeter

Question 42

Which of the following types of multimeters displays measurements digitally?

Accepted Answer

Digital

Answer

Electronic

Answer

Mechanical

Answer

Analog

Question 43

What is the SI unit of resistance?

Accepted Answer

Ohm

Answer

Ampere

Answer

Volt

Question 44

What is the primary function of a capacitor in an electrical circuit?

Accepted Answer

To store electrical energy

Answer

To resist the flow of electricity

Answer

To generate electricity

Answer

To conduct electricity

Question 45

What is the SI unit of capacitance?

Accepted Answer

Farad

Answer

Ampere

Answer

Ohm

Answer

Volt

Question 46

What is the SI unit for denoting electrical current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Question 47

Which device is specifically employed to measure voltage?

Accepted Answer

Voltmeter

Answer

Multimeter

Answer

Ammeter

Answer

Ohmmeter

Question 48

What is the primary function of a fuse within an electrical circuit?

Accepted Answer

Protecting against excessive current

Answer

Regulating voltage

Answer

Isolating components

Answer

Increasing current flow

Question 49

Which of these materials is known for its ability to conduct electricity efficiently?

Accepted Answer

Copper

Answer

Glass

Answer

Wood

Answer

Plastic

Question 50

What is the main purpose of a resistor in an electrical circuit?

Accepted Answer

Limiting current flow

Answer

Boosting voltage

Answer

Amplifying signals

Answer

Storing energy

Question 51

Among the following options, which is NOT a crucial safety precaution when working with electricity?

Accepted Answer

Directly touching electrical wires with bare hands

Answer

Employing the appropriate tools and equipment

Answer

Using insulated protective gloves

Question 52

What is the fundamental distinction between AC and DC current?

Accepted Answer

AC alternates in direction, while DC flows consistently in one direction

Answer

AC operates at higher voltage levels than DC

Answer

DC is more hazardous than AC