Electrical True and False

Question 1

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

Answer 1

false

Question 2

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

Answer 2

true

Question 3

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

Answer 3

true

Question 4

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

Answer 4

true

Question 5

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

Answer 5

false

Question 6

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

Answer 6

false

Question 7

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.

Answer 7

true

Question 8

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

Answer 8

false

Question 9

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

Answer 9

false

Question 10

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

Answer 10

false

Question 11

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

Answer 11

true

Question 12

National Electrical Code is shorted as NEC.

Answer 12

true

Question 13

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

Answer 13

false

Question 14

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

Answer 14

true

Question 15

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

Answer 15

true

Question 16

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

Answer 16

true

Question 17

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

Answer 17

true

Question 18

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

Answer 18

false

Question 19

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

Answer 19

false

Question 20

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

Answer 20

true

Question 21

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

Answer 21

false

Question 22

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

Answer 22

true

Question 23

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.

Answer 23

false

Question 24

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

Answer 24

true

Question 25

RMCs are both light and inexpensive.

Answer 25

false

Question 26

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.

Answer 26

true

Question 27

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

Answer 27

true

Question 28

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

Answer 28

true

Question 29

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.

Answer 29

true

Question 30

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.

Answer 30

true

Question 31

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

Answer 31

false

Question 32

Aluminum conduit is one type of metallic conduit.

Answer 32

true

Question 33

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.

Answer 33

true

Question 34

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

Answer 34

true

Question 35

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

Answer 35

true

Question 36

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.

Answer 36

true

Question 37

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.

Answer 37

false

Question 38

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

Answer 38

true

Question 39

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

Answer 39

true

Question 40

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

Answer 40

true

Question 41

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

Answer 41

false

Question 42

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.

Answer 42

false

Question 43

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

Answer 43

true

Question 44

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

Answer 44

true

Question 45

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

Answer 45

true

Question 46

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.

Answer 46

true

Question 47

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

Answer 47

true

Question 48

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

Answer 48

true

Question 49

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.

Answer 49

true

Question 50

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

Answer 50

false

Question 51

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

Answer 51

true

Question 52

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

Answer 52

true

Question 53

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

Answer 53

false

Question 54

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.

Answer 54

true