C4 LT4

Question 1

What is an analogue-to-digital converter?

Answer 1

Converts analogue voltage into a digital signal

Question 2

What are some causes of transient voltages?

Answer 2

Lightning strikes, unfiltered equipment, power being switched on and off

Question 3

Why is it important to use proper test leads when using test equipment?

Answer 3

Ensure safety

Question 4

What is the recommended procedure for connecting the leads of a DMM to a circuit or component?

Answer 4

Black lead to negative, red lead to positive. Black lead connected first.

Question 5

Where do you plug the black test lead when measuring DC voltage with a DMM?

Answer 5

Jack labelled ‘COM’

Question 6

What should be used if the current is higher than what the meter is rated for?

Answer 6

AC clamp-on ammeter

Question 7

When should you use a DC clamp-on ammeter?

Answer 7

current higher than meter rating

Question 8

Why should you never connect a DMM set for ohms to an energized circuit?

Answer 8

Damage the meter

Question 9

What type of display do digital meters have?

Answer 9

Numerical digits

Question 10

What do the categories in a DMM classify?

Answer 10

Application and equipment usage for testing voltages up to 1000 volts

Question 11

Where is the category rating usually stamped on?

Answer 11

Test probe

Question 12

What does protective clothing made of durable flame-resistant material provide protection from?

Answer 12

Hot and sharp objects

Question 13

Where do you plug the red test lead when measuring DC voltage with a DMM?

Answer 13

Jack labelled ‘V’

Question 14

What should you do before testing a component with a DMM set to resistance?

Answer 14

Remove or isolate

Question 15

What are panel types of meters used for?

Answer 15

Displaying electrical measurements

Question 16

What does a category-rated meter provide protection from?

Answer 16

Overcurrent faults

Question 17

What should you do if a test lead is damaged?

Answer 17

Replace with new one with same category rating

Question 18

What is required to protect from falling objects, impact, and electrical shock?

Answer 18

Hard hat or protective helmet

Question 19

Where is the bench type meter commonly used?

Answer 19

In lab areas and on workbenches

Question 20

What is the hand-held type of meters used for?

Answer 20

Troubleshooting and field measurements

Question 21

What precaution should be taken when working with circuits?

Answer 21

Assume energized until confirmed de-energized

Question 22

What organization sets the standards for electrical measurement category ratings for test tools?

Answer 22

IEC (International Electrotechnical Commission)

Question 23

What is a transient voltage?

Answer 23

Temporary voltage spike in an electrical circuit

Question 24

What should be the relationship between the category rating of test leads and the tester?

Answer 24

Equal or exceeds

Question 25

What should be checked for on test leads?

Answer 25

Wear and abuse

Question 26

What protective equipment should be worn when working with circuits?

Answer 26

Appropriate gear for area

Question 27

What is the advantage of digital meters over analogue meters?

Answer 27

Faster and easier to read

Question 28

Where is Category I equipment used?

Answer 28

Protected electronic equipment not directly connected to mains

Question 29

What may also be stamped on a test lead?

Answer 29

Amperage rating

Question 30

Should correct polarity be ensured when connecting test leads to an AC voltage waveform?

Answer 30

No

Question 31

Where are analogue-to-digital converters used?

Answer 31

Digital meters

Question 32

Where is Category II equipment used?

Answer 32

Single-phase receptacle-connected loads like appliances and portable tools

Question 33

Should correct polarity be ensured when connecting test leads to a DC voltage?

Answer 33

Yes

Question 34

What should be done if a negative sign is displayed in the DMM's display window during measurements?

Answer 34

Reverse the meter leads.

Question 35

What should you do first when measuring DC voltage with a DMM?

Answer 35

Set function switch to DC volts

Question 36

What should you do before plugging in the test leads when measuring AC amps?

Answer 36

Set to highest current range

Question 37

Why is it important not to change the function switch position while the circuit is energized?

Answer 37

To avoid damage or injury

Question 38

How should the ammeter be connected in the circuit for measurement?

Answer 38

In series

Question 39

To avoid damaging the meter, what should you do if you are done with current measurements?

Answer 39

Turn function selector switch to OFF position

Question 40

What are the steps to connect a DC clamp-on ammeter?

Answer 40

turn off power, open circuit, connect leads

Question 41

Where should you plug the black lead when using a DMM for resistance?

Answer 41

Common jack

Question 42

Where should you plug the red lead when using a DMM for resistance?

Answer 42

Resistance jack (N)