Question 1

Most control circuits in industry today utilize AC to provide electrical energy for devices that control equipment.

Accepted Answer

False

Question 2

The transformer must be sized to handle the full load current for all of the devices that may be in operation at any given time.

Accepted Answer

This is true. The transformer needs to be able to handle the maximum load current that may occur, even if all the devices are operating at the same time.

Question 3

Voltage ____________________ in transformers is the difference between the no-load voltage and the full-load voltage.

Accepted Answer

regulation

Question 4

The main power that is supplied to industries in the United States is three phase (3F), ____ volts alternating current (VAC), at a frequency of 60 Hertz (Hz).&#10;A) 480&#10;B) 240&#10;C) 120&#10;D) 24

Accepted Answer

The most common voltage used for three phase power in the United States is 480 VAC, and it is used for industrial applications. Choice A is the only option in the list that represents the voltage used for this purpose.

Question 5

What is the standard frequency that is utilized in Europe, Asia, and many countries throughout the world?&#10;A) 45 Hz&#10;B) 50 Hz&#10;C) 55 Hz&#10;D) 60 Hz

Accepted Answer

The standard frequency utilized in Europe, Asia, and many countries throughout the world is 50 Hz.

Question 6

On a circuit diagram, the rule for assigning wire numbers states that the wire number&#10;will change every time the wire goes through a device.

Accepted Answer

The wire number is changed every time the wire goes through a device so that each wire connected to that device has a unique and identifiable number.

Question 7

Temperature ____ in a transformer is the amount by which the temperature of the windings and insulation exceeds the existing ambient or surrounding temperature.&#10;A) overload&#10;B) overvoltage&#10;C) rise&#10;D) upswing

Accepted Answer

Temperature rise is a term used to describe the amount of temperature increase above the surrounding or ambient temperature in the windings and insulation of a transformer. The other options, overload and overvoltage, refer to different electrical conditions that can occur in transformers but do not specifically relate to temperature. "Upswing" is not a commonly used term in the context of transformers.

Question 8

Utility supply problems can be overcome by connecting a(n) ____ between the utility supply and sensitive load equipment.&#10;A) uninterruptible power system (UPS)&#10;B) battery module&#10;C) pulse width modulation (PWM)&#10;D) ampacity conductor

Accepted Answer

An uninterruptible power system (UPS) is designed to provide near-instantaneous, uninterrupted electrical power to connected equipment in the event of a power outage or voltage sag/dip. This will help to overcome utility supply problems and minimize disruption to sensitive load equipment. Battery modules, pulse width modulation (PWM), and ampacity conductors may also have applications in power management, but they may not be as effective in addressing utility supply problems.

Question 9

The transformer that converts the 480 VAC to 120 VAC for use in the control circuit is called the ____________________.

Accepted Answer

The answer of The transformer that converts the 480 VAC...

Question 10

The primary purpose of a(n) ____________________ is to convert the incoming AC voltage to a DC voltage for use by the control circuit.

Accepted Answer

The answer of The primary purpose of a(n) ____________________ is...

Deck 1: Transformers and Power Supplies