C-4

Question 1

What is a DMM? What does it measure?

Answer 1

Digital Multimeter (combination of ammeter, voltmeter, ohmmeter) measures voltage, current, resistance, frequency, and temperature

Question 2

A DMM Ammeter measures up to how much current?

Answer 2

10A

Question 3

A digital Clamp-On ammeter allows you to take circuit current measurements without interrupting or opening circuit. True/False

Answer 3

True

Question 4

Which DMM setting would be used to measure voltage output of a Alternator and Rectifier

Answer 4

Alternator : AC volt Rectifier : DC volt

Question 5

Which meter function would be selected to provide quick and easy testing of whether a fuse is open or has a complete path through (continuity)

Answer 5

Continuity function of a DMM

Question 6

Which measurement function of aDMM requires an internal battery to provide current flow through circuit?

Answer 6

resistance

Question 7

Which feature of a DMM would be used to test rapidly changing signal?

Answer 7

bar graph

Question 8

What CSA standard covers workplace electrical safety?

Answer 8

Z462-08

Question 9

When connecting a DMM in line to measure AC amps, red test leads go into the _____ current jack

Answer 9

highest current jack

Question 10

A DMM set for ohms is tested on an energized circuit, what happens?

Answer 10

damaging of meter

Question 11

What is transient voltage? Why do they occur

Answer 11

Transient voltage is a temporary voltage spike in an electric circuit because of lightning strikes, unfiltered equipment, power being switched on and off

Question 12

AC and DC voltmeters must be connected in parallel to circuit. True/False

Answer 12

True

Question 13

AC and DC ammeters must be connected in series to prevent shorts. True/False

Answer 13

True

Question 14

Black lead in the com(common) jack which is the ______ lead of the circuit.

Answer 14

negative

Question 15

Red lead should be in V/resistance jack and connected to ______ lead

Answer 15

positive

Question 16

The digital wattmeter’s current jack must be connected in series. True/False

Answer 16

true

Question 17

The digital wattmeter’s voltage jack must be connected in parallel. True/False

Answer 17

true

Question 18

What should always be done with a conductor before and after testing the conductor

Answer 18

grounding conductor

Question 19

Minimum reading when meggering motor conductor

Answer 19

1mega ohm

Question 20

What are meggers used for?

Answer 20

Used to check conductors installed in conduit or raceway for grounds, shorts, opens. testing insulation electrical equipment for resistance changes

Question 21

What unique function does a clamp on ammeter have?

Answer 21

allows hold button, measures in rush current from motor startup

Question 22

megger supplies voltages from ____ volts DC to ____ volts DC

Answer 22

250 to 5000

Question 23

Digital insulation testers are also known as ______?

Answer 23

meggers

Question 24

Cause of insulation deterioration?

Answer 24

mechanical damage, fault current, excessive heat, oil, moisture, voltage stresses

Question 25

non-sinusoidal waveforms such as electronic ballasts require RMS or average responding meter.

Answer 25

True RMS

Question 26

two methods of measuring waveform in DMM

Answer 26

True RMS, Average responding meter

Question 27

The effect a meter has on the circuit

Answer 27

meter loading

Question 28

most DMM's have an input impedance of about?

Answer 28

10megaohms

Question 29

A rectifier converts ____ to ____

Answer 29

AC to DC

Question 30

Maintenance of digital meters include

Answer 30

Calibration, inspection, service, battery replacement, fuse replacement

Question 31

Causes of false readings on a DMM on a de-energized circuit

Answer 31

Capacitive coupling

Question 32

What are false readings called?

Answer 32

ghost, stray voltage

Question 33

The resolution is the smallest measurement of the scale that can be shown on the display. True/False

Answer 33

True

Question 34

The Autopolarity feature indicates that lead polarity is reversed for DC measurements. True/False

Answer 34

True

Question 35

Autoranging automatically selects the proper measurement range. True/False

Answer 35

True

Question 36

In manual range, what is shown on the display if the range is too low for measurement?

Answer 36

Overload (OL)

Question 37

Meters have a window called display. True/False

Answer 37

True

Question 38

LED or LCD to display digits. True/False

Answer 38

True

Question 39

The display is uniquely energized by analog to digital electronic circuity. True/False

Answer 39

True

Question 40

Meter test leads can be replaced with the cheapest leads? True/False

Answer 40

False

Question 41

If a meter fuse is blown, it can be replaced with any fuse. True/False

Answer 41

False

Question 42

If a battery symbol appears on the display, the battery needs to be replaced. True/False

Answer 42

True

Question 43

How do you test the leads of a DMM?

Answer 43

change to resistance function and touch leads together, the display reads 0.5 ohms or less.