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CM 2112 > Electrical True and False > Flashcards

Electrical True and False Flashcards

1
Q

Clamps are used to mount the conduit to ceilings or walls using screws or bolts.

A

false

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2
Q

There are many types of individual electrical connectors which are categorized by level, function, and type of termination.

A

true

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3
Q

Air circuit breakers can be used for low-voltage and some medium-voltage circuits.

A

true

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4
Q

Liquidtight flexible metallic conduit (LFMC) is also called ‘liquidtight’ and ‘sealtight’.

A

true

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5
Q

Ribbon cables are quite flexible and can only handle both high and low voltage applications.

A

false

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6
Q

Cable is a single electrical conductor, whereas a wire is a group of cables covered in sheathing.

A

false

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7
Q

Since aluminum resists corrosion extremely well, aluminum conduits are preferred in locations where they would be exposed to large amounts of water, or corrosive substances.

A

true

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8
Q

Type 7 enclosures and Type 8 enclosures are non-hazardous location enclosure types.

A

false

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9
Q

Flexible metallic conduit (FMC) offers protection against impacts and corrosion, and can be used outdoors, buried or embedded.

A

false

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10
Q

Water resistant connectors can withstand being submerged and also provide protection for the electrical connections against water damage from splashes or occasional dampness.

A

false

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11
Q

Moisture/oil resistant connectors are designed to protect the electrical connections from damage caused by oil or moisture.

A

true

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12
Q

National Electrical Code is shorted as NEC.

A

true

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13
Q

Molded case external casing (circuit breakers) is generally used for medium voltage circuit breakers.

A

false

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14
Q

PVC conduits cannot be used in hazardous locations, as ground conductors or in locations where they are exposed to ambient temperatures over 50°C.

A

true

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15
Q

Motor control devices are designed to be controlled in a manual, automatic, or remote manner.

A

true

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16
Q

Vacuum circuit breakers are almost exclusively used in medium voltage circuits because of their compact size and high reliability and low maintenance.

A

true

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17
Q

Intelligent motor control devices use advanced microprocessors for controlling the power of electronic devices employed in an electric motor.

A

true

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18
Q

Electrical metallic tubing (EMT) is commonly known as ‘Greenfield’ or ‘flex’ conduit.

A

false

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19
Q

Air circuit breakers operate by increasing the arc voltage, which is the maximum voltage required to maintain an arc.

A

false

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20
Q

There are two contacts in a circuit breaker: a fixed contact and a floating contact.

A

true

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21
Q

Liquidtight flexible metallic conduit (LFMC) has an overall non-metallic outer covering that is not waterproof or resistant to cracking from sunlight exposure.

A

false

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22
Q

A very simple example of a motor control mechanism is a variable frequency drive (VFD), which adjusts motor voltage, changing the rotation speed.

A

true

23
Q

Common wire sizes are 10, 12 and 14 - a higher number means a larger wire size, and affects the amount of power it can carry.

A

false

24
Q

Each application requires a certain wire size for installation, and the right size for a specific application is determined by the code.

A

true

25
Q

RMCs are both light and inexpensive.

A

false

26
Q

To prevent drips and water-logging in the conduit runs, install drains at the lowest points of each run that might be affected, or at locations where water might get trapped and accumulate.

A

true

27
Q

An installation may require a lot of bends, and bending conduits on location might damage them or reduce the internal diameter.

A

true

28
Q

Conduit bodies are tubular units with openings at each end for admitting conduits, and providing access to the wires.

A

true

29
Q

One great advantage of flexible metallic conduit (FMC) is its ability to absorb vibrations and allow movement, so it is often used to house wiring for pumps, motors and manufacturing equipment.

A

true

30
Q

Rigid metal conduit (RMC) usually has the toughest and thickest walls made from coated stainless steel or aluminum, so they offer excellent protection against impacts, punctures and cuts.

A

true

31
Q

PVC conduits are available in both Schedule 40 and 80, which are basically ratios of the thickness of the wall to its outer diameter.

A

false

32
Q

Aluminum conduit is one type of metallic conduit.

A

true

33
Q

Since electrical conduits are essentially a safety feature, you should select the material, size and fittings based on the environment of the installation and the type of wiring it will be housing.

A

true

34
Q

Fittings for electrical metallic tubing (EMT) are both readily available and inexpensive.

A

true

35
Q

Mechanical lugs are available bolted with two screws or with four screws.

A

true

36
Q

Unshielded twisted pair cables (UTP) are more affordable than coaxial or optical fiber cables, so UTP cables are often used in telephones, security cameras and data networks.

A

true

37
Q

Electrical nonmetallic tubing (ENT) can only be used outdoors, in areas where they will not be exposed to physical damage, hazardous conditions, temperatures over 50°C and the conductors do not carry over 600 volts.

A

false

38
Q

The National Electrical Code and Local Building Codes regulate the manner of installation and the types of wires and cables for various electrical applications.

A

true

39
Q

Nipples are threaded on both ends and can be installed quickly and easily.

A

true

40
Q

Three methods of mounting circuit breakers: fixed mounted; removable mounted and drawout mounted.

A

true

41
Q

Liquidtight flexible metallic conduit (LFMC) is durable and strong; therefore, they can be exposed to stresses or encased in concrete.

A

false

42
Q

A Schedule 80 conduit will have a thinner wall than Schedule 40, so it is not permitted for installations where the conduit will be exposed to physical stresses.

A

false

43
Q

Electrical metallic tubing (EMT) is light and bends easily.

A

true

44
Q

Mechanical lugs are suitable for brass lightning protection and where there may be plenty of vibration

A

true

45
Q

Direct-buried cables (DBCs) have high tolerance to temperature changes, moisture and other environmental factors.

A

true

46
Q

A bushing is installed on the inside of the box opening and threaded into the conduit end, separating the conductors from the edges of both the opening and the conduit end.

A

true

47
Q

For coaxial cable, the two inner shields share the same geometric axis.

A

true

48
Q

Triplex wires are usually used in single-phase service drop conductors, between the power pole and weather heads.

A

true

49
Q

The adjustable speed drive is a unified combination of devices that enable operators to drive as well as adjust the operating speed of a mechanical load.

A

true

50
Q

RMCs are usually called ‘thinwalls’, since they have a much thinner wall than others.

A

false

51
Q

Wire Lettering: H represents heat resistance and W represents suitable for wet locations.

A

true

52
Q

Most connectors have two main parts: the housing and terminals for making the connections.

A

true

53
Q

A reducer is a special kind of combination coupling that allows you to connect raceways of one trade size only to smaller ones.

A

false

54
Q

Thermal circuit breakers use heat as a measure of current flowing through a circuit and disconnect once a certain temperature is reached, while magnetic circuit breakers rely on electromagnetic energy created by electricity to trip a switch and disconnect the power supply.

A

true

CM 2112 (12 decks)

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