Question 1

As the temperature increases, the resistance of wire decreases.

Accepted Answer

As the temperature increases, the resistance of a wire increases according to the temperature coefficient of resistance (TCR).

Question 2

The ampacity of the wire must be selected on the basis of the lowest temperature rating in the circuit.

Accepted Answer

The ampacity of the wire should be chosen based on the lowest temperature rating, as this is the temperature at which the wire will experience the highest resistance and heat. Choosing an ampacity based on a higher temperature rating may result in the wire overheating and potentially causing a fire.

Question 3

The ____ is the point of attachment for conductors such as circuit breakers, disconnects, switches, and so forth.&#10;A) howling&#10;B) coupling&#10;C) junction&#10;D) termination

Accepted Answer

The point of attachment for conductors such as circuit breakers, disconnects, switches, and so forth is called the termination.

Question 4

When installing air conditioning equipment, if wire is used that is larger than needed, it will cause excessive voltage drop and damage the equipment.

Accepted Answer

Using wire that is larger than needed will not cause damage to the equipment, but it may increase the cost of installation unnecessarily. It is more important to use wire that is appropriately sized to avoid voltage drop and ensure safe and efficient operation of the equipment.

Question 5

The equipment nameplate is generally shown on the unit itself.

Accepted Answer

The nameplate is typically located on the equipment itself, usually near the power supply or control panel.

Question 6

The voltage rating of wire is determined by ____.&#10;A) the type of material of which the wire is made&#10;B) the type of insulation&#10;C) its diameter&#10;D) its weight

Accepted Answer

The voltage rating of wire is determined by the type of insulation. Different types of insulation have different maximum voltage ratings based on their dielectric strength. The diameter and weight of the wire may affect its current-carrying capacity, but not its voltage rating. The type of material used to make the wire may affect its overall conductivity but not necessarily its voltage rating.

Question 7

Which of the following is not a factor when determining the resistance of a piece of wire?&#10;A) The diameter of the wire&#10;B) The material of the wire&#10;C) The length of the wire&#10;D) The pressure of the wire

Accepted Answer

The pressure of a wire is not a factor when determining its resistance. The factors that do affect resistance are the diameter of the wire, the material of the wire, and the length of the wire.

Question 8

Testing a unit for excessive voltage can be done with a ____.&#10;A) high-end voltmeter&#10;B) voltmeter&#10;C) right-leg voltmeter&#10;D) voltage divider

Accepted Answer

A voltmeter is designed to measure voltage and is the appropriate tool for testing excessive voltage in a unit. A high-end voltmeter or voltage divider may be more precise, but a standard voltmeter will suffice for most testing purposes. A right-leg voltmeter is used in medical applications and is not relevant for testing excessive voltage in a unit.

Question 9

The larger the diameter of a wire, the less resistance it will have and the more current it can carry.

Accepted Answer

This is because a larger diameter wire provides a larger cross-sectional area for the current to flow through, which results in less resistance. Additionally, Ohm's law states that current (I) is directly proportional to voltage (V) and inversely proportional to resistance (R) (I = V/R). Therefore, with less resistance, the wire can carry more current.

Question 10

The circular mil area of stranded wire is determined by finding the area of one of the strands and then ____ the number of strands.&#10;A) adding&#10;B) subtracting&#10;C) multiplying by&#10;D) dividing by

Accepted Answer

To find the circular mil area of stranded wire, we need to multiply the area of one strand by the total number of strands.

Deck 6: Wire Size and Voltage Drop