NAVEDTRA 14176A, NEETS Mod. 4, Ch. 1

Question 1

Which unit of measurement is used to determine the cross-sectional area of a square or rectangular conductor?

Answer 1

Square mil

Question 2

What is the standard unit of measurement of a round wire cross-sectional area?

Answer 2

Circular mil

Question 3

What can be done to increase the flexibility of wire?

Answer 3

Stranding

Question 4

What is a heavy copper strap or bar that is used to connect several circuits together?

Answer 4

Bus bar

Question 5

What is the resistance in ohms offered by a unit volume (the circular-mil-foot or the centimeter cube) of a substance to the flow of electric current?

Answer 5

Specific resistance

Question 6

What is the reciprocal of conductivity?

Answer 6

Resistivity

Question 7

What is the most common method of measuring wire size in the Navy?

Answer 7

American Wire Gauge (AWG)

Question 8

What is a single slender rod or filament of drawn metal called?

Answer 8

Wire

Question 9

Which type of wire is suitable for carrying an electric current?

Answer 9

Conductor

Question 10

Which type of conductor is composed of a group of wires or of any combination of groups of wires?

Answer 10

Stranded

Question 11

Which wire property is used to determine what size is needed for a given load, or current drain?

Answer 11

Current rating

Question 12

What prepares tables showing the safe current ratings for sizes and types of conductors covered with various types of insulation? 


Answer 12

National Board of Fire Underwriters

Question 13

What is the best conductor?

Answer 13

Silver

Question 14

What are the two most commonly used conductors?

Answer 14

Copper and Aluminum

Question 15

Only about what percent of the conductivity of copper does aluminum have?

Answer 15

60

Question 16

What is the discharge of electricity from the wire when it has a high potential called?

Answer 16

Corona

Question 17

What are generally referred to as “insulators” or “insulating material.”?

Answer 17

Nonconductors

Question 18

Insulation resistance along with what else are the two fundamental properties of insulating materials? 


Answer 18

Dielectric strength

Question 19

What is the resistance to current leakage through the insulation materials called?

Answer 19

Insulation resistance

Question 20

What can insulation resistance be measured with that wont damage the insulation?

Answer 20

Megger

Question 21

What is the ability of an insulator to withstand potential difference?

Answer 21

Dielectric strength

Question 22

What is normally used for low- or medium-range voltage?

Answer 22

Rubber insulation

Question 23

Which standard has the National Electrical Code (NEC) adopted as the minimum requirements for rubber insulation as specified by Underwriters’ Laboratories? 


Answer 23

Code-graded rubber

Question 24

Latex rubber is a high-grade compound consisting of what percent of unmilled grainless rubber?

Answer 24

90

Question 25

Which rubber compound does not carry the "R" designator for many of its applications?

Answer 25

Silicone

Question 26

What is one of the most common types of plastic insulating materials?

Answer 26

Thermoplastic

Question 27

What is cotton cloth that has been coated with an insulating varnish known as?

Answer 27

Varnished cambric

Question 28

Varnished cambric and paper insulation for cables are the two types of insulating materials most widely used at voltages above how many volts?

Answer 28

15,000

Question 29

What is a high-temperature insulation used extensively in aircraft and equipment installations?

Answer 29

Extruded polytetrafluoroethylene

Question 30

How many degrees Celsius is Fluorinated Ethylene Propylene (FEP) rated at?

Answer 30

200

Question 31

Which type of fibers have been found to cause severe lung damage and cancer of the gastrointestinal tract?

Answer 31

Asbestos

Question 32

How many different types of asbestos wire does the NEC have designators for?

Answer 32

Eight

Question 33

What serves as a satisfactory insulation for extremely high-voltage cables when it is impregnated with a high grade of mineral oil?

Answer 33

Paper

Question 34

What type of wire is used on the coils of meters, relays, small transformers, motor windings, and so forth?

Answer 34

Magnet wire

Question 35

What is the thinnest insulating coating that can be applied to wires?

Answer 35

Enamel

Question 36

Which type of cable was developed to meet the needs of a noncombustible, high heat-resistant, and water- resistant cable?

Answer 36

Mineral-insulated (MI)

Question 37

Up to how many electrical conductors does MI cable have?

Answer 37

Seven

Question 38

What are the two categories of materials that make up the protection for a wire or cable?

Answer 38

Nonmetallic or metallic

Question 39

What is by far the most common type of nonmetallic material used to protect wires and cables?

Answer 39

Fibrous braid

Question 40

Which material is commonly used only in special classes of service and is made as a solid felted covering for a cable?

Answer 40

Unspun felted cotton

Question 41

What are the two types of metallic wire protection?

Answer 41

Sheath or armor

Question 42

Lead-sheathed cable is one of three types currently being used: alloy lead, pure lead, and what else?


Answer 42

Reinforced lead

Question 43

What is defined as two concentric wires, cylindrical in shape, separated by a dielectric of some type?

Answer 43

Coaxial cable