Electrical Motor Controls

What is the primary function of an electrical motor control?

• To start and stop the motor

• To change the motor's color

• To increase the motor's weight

• To decrease the motor's size

Tags

NGSS.HS-PS3-3

Which component is used to protect an electric motor from overload?

• Resistor

• Capacitor

• Circuit breaker

• Inductor

Tags

NGSS.MS-ETS1-2

What type of motor control is used to vary the speed of an AC motor?

• Variable Frequency Drive (VFD)

• Direct On Line (DOL) starter

• Star-Delta starter

• Soft starter

In a motor control circuit, what is the role of a contactor?

• To provide a path for current

• To physically connect and disconnect the motor from the power supply

• To measure the motor's speed

• To cool the motor

Which of the following is a common method for starting a three-phase induction motor?

• Star-Delta starting

• Series starting

• Parallel starting

• Direct starting

What is the purpose of a soft starter in motor control?

• To reduce the initial surge of current

• To increase the motor's speed

• To change the motor's direction

• To cool the motor

Which device is used to convert AC to DC in motor controls?

• Rectifier

• Transformer

• Inductor

• Capacitor

What is the function of a relay in an electrical motor control circuit?

• To open or close circuits electromechanically or electronically

• To store electrical energy

• To increase voltage

• To decrease current

Which of the following is a benefit of using a Variable Frequency Drive (VFD)?

• Energy savings

• Increased noise

• Higher maintenance costs

• Reduced motor lifespan

Tags

NGSS.HS-ESS3-2

NGSS.HS-ETS1-3

What is the main advantage of using a Direct On Line (DOL) starter?

• Simplicity and low cost

• High energy efficiency

• Variable speed control

• Reduced starting current