Three-Phase Power Circuit Control Quiz

What is the purpose of the control transformer in the circuit?

• To step down the high voltage to a lower control voltage

• To increase the voltage for the motor

• To provide backup power

• To convert AC to DC

What is the first component added to the control circuit after the transformer?

• A capacitor

• A relay

• A resistor

• A fuse

Which button is normally closed in the control circuit?

• Start button

• Stop button

• Power button

• Reset button

What color is the indicator light when the motor is stopped?

• Yellow

• Red

• Blue

• Green

What happens to the red indicator light when the motor coil is energized?

• It turns on

• It blinks

• It changes color

• It turns off

What is the function of a seal-in contact in the circuit?

• To provide emergency stop

• To allow the motor to run continuously without holding the start button

• To increase the motor speed

• To reduce power consumption

How does the seal-in contact affect the start button?

• It disconnects the start button

• It is in parallel with the start button

• It bypasses the start button

• It keeps the start button pressed

What must be done if the power goes off and then comes back on?

• The stop button must be pressed

• The circuit will reset itself

• The start button must be pressed again

• The motor will restart automatically

What is the purpose of the safety circuit in the control system?

• To reduce noise

• To increase efficiency

• To ensure the motor stops during power loss

• To prevent overheating

What happens to the contacts when the stop button is pressed?

• They short circuit

• They open

• They close

• They remain unchanged