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ATI2 MAR2017 > NAVEDTRA 14176A, NEETS Mod. 4, Ch. 1 > Flashcards

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

1
Q

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

A

Square mil

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2
Q

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

A

Circular mil

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3
Q

What can be done to increase the flexibility of wire?

A

Stranding

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4
Q

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

A

Bus bar

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5
Q

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?

A

Specific resistance

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6
Q

What is the reciprocal of conductivity?

A

Resistivity

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7
Q

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

A

American Wire Gauge (AWG)

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8
Q

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

A

Wire

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9
Q

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

A

Conductor

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10
Q

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

A

Stranded

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11
Q

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

A

Current rating

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12
Q

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


A

National Board of Fire Underwriters

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13
Q

What is the best conductor?

A

Silver

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14
Q

What are the two most commonly used conductors?

A

Copper and Aluminum

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15
Q

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

A

60

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16
Q

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

A

Corona

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17
Q

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

A

Nonconductors

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18
Q

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


A

Dielectric strength

19
Q

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

A

Insulation resistance

20
Q

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

A

Megger

21
Q

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

A

Dielectric strength

22
Q

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

A

Rubber insulation

23
Q

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


A

Code-graded rubber

24
Q

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

A

90

25
Q

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

A

Silicone

26
Q

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

A

Thermoplastic

27
Q

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

A

Varnished cambric

28
Q

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

A

15,000

29
Q

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

A

Extruded polytetrafluoroethylene

30
Q

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

A

200

31
Q

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

A

Asbestos

32
Q

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

A

Eight

33
Q

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

A

Paper

34
Q

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

A

Magnet wire

35
Q

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

A

Enamel

36
Q

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

A

Mineral-insulated (MI)

37
Q

Up to how many electrical conductors does MI cable have?

A

Seven

38
Q

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

A

Nonmetallic or metallic

39
Q

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

A

Fibrous braid

40
Q

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

A

Unspun felted cotton

41
Q

What are the two types of metallic wire protection?

A

Sheath or armor

42
Q

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


A

Reinforced lead

43
Q

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

A

Coaxial cable

ATI2 MAR2017 (42 decks)

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