Understanding AC and DC Motors

Which of the following is a type of AC motor commonly used in household appliances?

• Series wound motor

• Synchronous motor

• Shunt wound motor

• Compound motor

Which type of DC motor is best suited for applications requiring a constant speed, regardless of load?

• Series DC motor

• Shunt DC motor

• Universal motor

• Stepper motor

Which of the following is NOT a basic component of an electric motor?

• Rotor

• Stator

• Carburettor

• Commutator

Which type of AC motor is most commonly used in industrial fans and pumps?

• Universal motor

• Induction motor

• Series DC motor

• Stepper motor

What is the main function of the commutator in a DC motor?

• To reduce friction

• To reverse the direction of current in the armature windings

• To increase the voltage

• To cool the motor

Which of the following applications would most likely use a DC motor?

• Mains-powered washing machine

• Battery-powered electric toy car

• Ceiling fan

• Industrial conveyor belt (powered by three-phase supply)

Which of the following is a key advantage of using an AC induction motor in household appliances?

• High starting torque

• Simple and robust construction

• Requires frequent maintenance

• Needs a commutator

What is the main difference between a synchronous AC motor and an induction AC motor?

• Synchronous motors run at a speed equal to the supply frequency, while induction motors run at a slightly lower speed.

• Induction motors require a commutator, while synchronous motors do not.

• Synchronous motors are only used in toys.

• Induction motors cannot be used in industry.

Which of the following is a typical application for a series DC motor?

• Electric clock

• Electric train

• Ceiling fan

• Industrial pump (three-phase)

In a basic electric motor, what is the stationary part called?

• Rotor

• Stator

• Armature

• Shaft