NCCER Meters review

A voltmeter is used to measure the value of a circuit's ____.

Electromotive force

A closed circuit is indicated by an ohmmeter reading of .

Zero

A meter that operates by sensing the strength of the electromagnetic field around the wire is a(n) .

Clamp-on ammeter

Current measurement in milliamps are typically read using a(n) _.

VOM

An expected resistance of 1,000,000 ohms would be measured using a .

Megohmmeter

Which category rating covers installation that present the lowest risk?

CAT I

Which of the following is true with regard to meter safety?

Thoroughly inspect all test equipment before each use.

CAT I (Overvoltage Category)

Electronic equipment and circuitry

CAT II (Overvoltage Category)

Single-phase loads such as small appliance tools, outlets at more than 30 feet from a CAT III source or 60 feet from a CAT IV source

CAT III (Overvoltage Category)

Three-phase motors, single-phase commercial or industrial lighting, switchgear, busduct and feeders in industrial plants.

CAT IV (Overvoltage Category)

Three-phase power at meter, service-entrance, or utility connection, any outdoor conductors, including signs, a pump, or exterior power generation (solar, wind, etc.).

Which of the following is true regarding analog meters?

Analog meters rely on a moving-coil meter movement.

A voltmeter is used to test _.

Exact voltages

In order to ensure safety, before measuring low voltages, you should first test for _.

Higher voltages

An ammeter is used to measure ____.

Current

Clamp-on ammeters operate by _.

Sensing the strength of the electromagnetic field around the wire

A meter with applied voltages of 500v or 1,000v is a(n) _.

Megohmmeter

A motor rotation testers _.

Is used to identify the motor legs

The highest level of protection is provided instruments rated as _.

CAT IV

The International Electrotechnical Commission (IEC) developed a safety standard for overvoltage installation categories of CAT I, CAT II, CAT III, and CAT IV for _.

Test equipment

What is the lowest acceptable overvoltage category rating for a multimeter that will be used to test small appliances?

CAT II

Used for electromagnetic effects or for providing electrical resistance, a ____ is a number of turns of wire.

Coil

A ____ uses a permanent magnet and moving coil arrangement to move a pointer across a scale.

d'Arsonval meter movement

Usually expressed in hertz, is the number of cycles completed each second by a given AC voltage.

Frequency

is an uninterrupted electrical path for current flow.

Continuity

Power from a solar PV system can cause a dangerous in equipment assumed to be de-energized.

Backfeed

The measurement of the electromotive force of a circuit is accomplished using a(n) _.

Voltmeter

When using a voltmeter that is not autoranging, start with the highest setting and work down until the meter reads somewhere between.

Half scale or 3/4 scale

A(n) _ is used to extend the range of a meter movement for current measurements. **

Shunt resistor

Ture or False? Always connect an ohmmeter in parallel with a load.

False

The voltage range of a meter movement can be extended by adding a(n) _ in series. **

Multiplier

Short circuits can be detected by using a(n) ____. **

Ohmmeter (Continuity)

What type of test equipment would you use to check the resistance between motor windings?

Megohmmeter

The phase sequence of a circuit is identified using a(n) _. **

Phase rotation tester

True or False? A voltage tester is used for precise voltage measurements.

False

A(n) _ is used to take electrical readings at specified intervals.

Data logger

Most digital ohmmeters have an audible tone to indicate a closed or low-resistance circuit, making them useful for performing _.

Continuity

Another name for a VOM is a(n) _.

Multimeter

Which of the following devices is also called an insulation resistance tester?

Megger

A Megohmmeter is known as

(Megger)