A1 LT9

Question 1

What precautions should be taken when using electrical measuring instruments?

Answer 1

Do not use resistance-measuring device on a live circuit

Question 2

How should you select the meter range for a reading?

Answer 2

Top two-thirds of the scale

Question 3

What should you not exceed when using a coil with an ohmmeter?

Answer 3

Current rating.

Question 4

What type of scale is used when there are equal spaces between each division?

Answer 4

Linear scale

Question 5

Why is it important to read the meter while looking straight at the pointer?

Answer 5

Accuracy

Question 6

What should you do when finished with a meter?

Answer 6

Switch it off

Question 7

What should you not exceed when using an ohmmeter?

Answer 7

Power rating of the meter.

Question 8

What is the error introduced when looking at the meter from off to either side?

Answer 8

Parallax error

Question 9

What should you switch a meter to if there is no OFF switch position?

Answer 9

Highest possible range

Question 10

What should you switch a multimeter to for AC voltage measurements?

Answer 10

Highest possible AC voltage range

Question 11

Why is it difficult to visually identify issues in an electric circuit?

Answer 11

Electricity cannot be seen

Question 12

What should you avoid when using galvanometer-based meter movements?

Answer 12

Avoid placing near other magnetic fields

Question 13

What are meters used for in relation to electricity?

Answer 13

Measure effects of electricity

Question 14

What can happen if a stray magnetic field affects the instrument?

Answer 14

Inaccurate responses or damage

Question 15

Why should you take great care with electrical meters?

Answer 15

Precision instruments, easily damaged

Question 16

What type of meter should be used based on whether you are working with DC or AC?

Answer 16

Match the meter to the supply

Question 17

Why are moving coil instruments particularly susceptible to vibration and sudden impact?

Answer 17

Delicate parts

Question 18

What can happen if the meter is not used in the proper position?

Answer 18

Inaccurate readings

Question 19

What should you do every time you change scales on an ohmmeter?

Answer 19

Zero the meter again

Question 20

Why should you use the built-in holding device when transporting or storing the meter?

Answer 20

To retain moving parts

Question 21

What are voltmeters used to measure?

Answer 21

Potential difference

Question 22

How are some meters constructed to protect against parallax error?

Answer 22

With a small mirror just below the scale markings

Question 23

Why is it important to test the voltmeter on a known source before and after using it?

Answer 23

To prevent faulty readings

Question 24

Why is it crucial to make sure the voltmeter is on the appropriate range setting?

Answer 24

To ensure accurate readings

Question 25

What is the purpose of performing meter readings in electricity?

Answer 25

Verify circuit concepts

Question 26

Why should the current be OFF when using a resistance-measuring device?

Answer 26

To avoid damaging the ohmmeter

Question 27

Why should an ammeter never be connected in parallel?

Answer 27

Forms a short circuit

Question 28

Why is it important to observe the meter polarity when connecting it into the circuit?

Answer 28

To avoid damaging the meter

Question 29

What must you observe when using an ohmmeter?

Answer 29

Never use on live circuits.