AETC 120 AC Circuits Written Final, Part 1

Which of the following is a key difference between AC and DC currents?

• AC can be easily transformed to higher or lower voltages

• DC is primarily used in household appliances

• AC flows in one direction

• DC cannot be converted into AC

What is the primary function of a transformer?

• Convert AC to DC

• Increase or decrease voltage levels

• Control the speed of a motor

• Convert DC to AC

How can you identify the primary winding of a transformer using a multimeter?

• By measuring the resistance and comparing it with the secondary winding

• By checking for voltage output

• By detecting the magnetic field

• By checking the color coding

What does the term "poles" in a relay refer to?

• The number of switch positions

• The number of separate circuits it can control

• The physical structure of the relay

• The voltage capacity of the relay

What distinguishes electromagnetic relays from solid-state relays?

• Electromagnetic relays use physical moving parts

• Solid-state relays can handle higher currents

• Electromagnetic relays are faster

• Solid-state relays use a transformer

Which tool is essential for testing the continuity of a transformer winding?

• Oscilloscope

• Voltmeter

The term "throws" in a relay refers to:

• The maximum voltage it can handle

• The number of stable positions per pole

• The resistance it offers in a circuit

• The physical length of the coil

Which wire gauge should be used to handle a higher current load?

• Smaller gauge number

• Larger gauge number

• Any gauge as long as it is copper

• Any gauge as long as it is aluminum

The main advantage of using a Variable Frequency Drive (VFD) is:

• It can convert DC to AC

• It provides overload protection

• It controls the speed of an AC motor

• It reduces the power use of the motor

What is the purpose of using a relay in a circuit?

• To convert AC to DC

• To protect against surges

• To control one electrical circuit by opening and closing contacts in another circuit

• To reduce electrical noise