Question 1

Which is the smallest AWG wire size?&#10;A) No. 0&#10;B) No. 4&#10;C) No. 26&#10;D) No. 50

Accepted Answer

The American Wire Gauge (AWG) system increases in number as the wire diameter decreases. Therefore, No. 50 AWG is the smallest wire size among the options listed.

Question 2

For pure metals such as silver, copper and aluminum, the resistance of a conductor ____ as the temperature increases.&#10;A) increases&#10;B) decreases&#10;C) remains unchanged&#10;D) changes only slightly

Accepted Answer

For pure metals, the resistance of the conductor increases as the temperature increases. This is because, with an increase in temperature, the atoms vibrate more violently, causing more collisions with electrons, thereby impeding the flow of current and increasing resistance.

Question 3

Line loss is power dissipated as heat.

Accepted Answer

Line loss is the power lost as heat due to the resistance of the wires and any other components of the electrical system.

Question 4

In the splicing process, when using a knife for stripping wire insulation, the insulation should be cut at a right angle to the conductor.

Accepted Answer

The insulation should be cut at a gentle angle to prevent cutting the conductor.

Question 5

A feeder circuit consists of the conductors between the service equipment and the final branch-circuit overcurrent device.

Accepted Answer

This is the correct definition of a feeder circuit according to the National Electrical Code.

Question 6

What is the most common insulating material used for conductors?&#10;A) copper&#10;B) silk&#10;C) aluminum&#10;D) plastic

Accepted Answer

Plastic materials, such as PVC (polyvinyl chloride) and PE (polyethylene), are the most commonly used insulating materials for conductors in electrical wiring and cables. They have good insulation properties, are easy to manufacture and work with, and are relatively inexpensive. Copper and aluminum are conductive materials and not suitable for insulation, while silk is not commonly used due to its high cost and limited availability.

Question 7

The amount of heat generated by current flowing through a conductor depends on the current value and the conductor's ____.&#10;A) length&#10;B) area&#10;C) resistance&#10;D) inductance

Accepted Answer

The amount of heat generated by current flowing through a conductor depends on the resistance of the conductor. The higher the resistance, the more heat is generated. Length and area can affect the resistance, but they do not directly determine the amount of heat generated. Inductance is a property related to how a conductor or circuit responds to changes in current and is not directly related to heat generation.

Question 8

The ____ of a conductor is limited by the temperature that its insulation can tolerate without deteriorating and/or losing its insulating quality.&#10;A) capacitance&#10;B) ampacity&#10;C) resistivity&#10;D) thermal constant

Accepted Answer

Ampacity is the maximum amount of electrical current that a conductor can safely carry without overheating and causing damage to insulation or the conductor itself. This limit is determined by the temperature rating of the conductor's insulation, which is based on the insulation material and its ability to withstand heat.

Question 9

To convert circular mils to circular millimeters, divide circular mils by ____.&#10;A) 10&#10;B) 25.4&#10;C) 1550&#10;D) 2550

Accepted Answer

To convert circular mils to circular millimeters, you divide the number of circular mils by 1973.5, which is approximately close to the given option 1550 when considering the options provided. However, it's important to note that the exact conversion factor is 1973.5, not 1550. This seems to be a simplification or error in the provided options.

Question 10

____ is the voltage drop caused by current flowing though the resistance of the wires.&#10;A) Power drop&#10;B) Wire drop&#10;C) Line loss&#10;D) Line drop

Accepted Answer

Line drop is the voltage drop caused by current flowing through the resistance of the wires.

Question 11

What unit is used to measure rectangular conductors?&#10;A) circular mil&#10;B) square mil&#10;C) AWG&#10;D) area mil

Accepted Answer

The answer of What unit is used to measure rectangular...

Question 12

The resistance of a wire is inversely proportional to its length.

Accepted Answer

The answer of The resistance of a wire is inversely...

Question 13

For which temperature is resistivity (K) defined?&#10;A) 32 deg F&#10;B) 68 deg F&#10;C) 86 deg F&#10;D) 100 deg F

Accepted Answer

The answer of For which temperature is resistivity (K) defined?&#10;A)...

Question 14

Flexible cords and cables may be used for the fixed wiring of a building.

Accepted Answer

The answer of Flexible cords and cables may be used...

Question 15

A correction factor is used for the ampacity of conductors in installations where the operating temperature is above ____ degrees Fahrenheit.&#10;A) 32&#10;B) 68&#10;C) 86&#10;D) 100

Accepted Answer

The answer of A correction factor is used for the...

Deck 9: Conductor Types and Sizes