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isjfiopasjfp > C-4 > Flashcards

C-4 Flashcards

1
Q

What is a DMM? What does it measure?

A

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

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2
Q

A DMM Ammeter measures up to how much current?

A

10A

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3
Q

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

A

True

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4
Q

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

A

Alternator : AC volt Rectifier : DC volt

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5
Q

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)

A

Continuity function of a DMM

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6
Q

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

A

resistance

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7
Q

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

A

bar graph

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8
Q

What CSA standard covers workplace electrical safety?

A

Z462-08

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9
Q

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

A

highest current jack

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10
Q

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

A

damaging of meter

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11
Q

What is transient voltage? Why do they occur

A

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

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12
Q

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

A

True

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13
Q

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

A

True

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14
Q

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

A

negative

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15
Q

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

A

positive

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16
Q

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

A

true

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17
Q

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

A

true

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18
Q

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

A

grounding conductor

19
Q

Minimum reading when meggering motor conductor

A

1mega ohm

20
Q

What are meggers used for?

A

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

21
Q

What unique function does a clamp on ammeter have?

A

allows hold button, measures in rush current from motor startup

22
Q

megger supplies voltages from ____ volts DC to ____ volts DC

A

250 to 5000

23
Q

Digital insulation testers are also known as ______?

A

meggers

24
Q

Cause of insulation deterioration?

A

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

25
Q

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

A

True RMS

26
Q

two methods of measuring waveform in DMM

A

True RMS, Average responding meter

27
Q

The effect a meter has on the circuit

A

meter loading

28
Q

most DMM’s have an input impedance of about?

A

10megaohms

29
Q

A rectifier converts ____ to ____

A

AC to DC

30
Q

Maintenance of digital meters include

A

Calibration, inspection, service, battery replacement, fuse replacement

31
Q

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

A

Capacitive coupling

32
Q

What are false readings called?

A

ghost, stray voltage

33
Q

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

A

True

34
Q

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

A

True

35
Q

Autoranging automatically selects the proper measurement range. True/False

A

True

36
Q

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

A

Overload (OL)

37
Q

Meters have a window called display. True/False

A

True

38
Q

LED or LCD to display digits. True/False

A

True

39
Q

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

A

True

40
Q

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

A

False

41
Q

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

A

False

42
Q

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

A

True

43
Q

How do you test the leads of a DMM?

A

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

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