Principle of induction motor

What is the principle of operation of an induction motor?

• A. Electromagnetic induction

• B. Electromechanical energy conversion

• C. Electrostatic induction

• D. Electrochemical energy conversion

Which of the following is the most commonly used type of induction motor?

• A. Single-phase induction motor

• B. Three-phase induction motor

• C. Synchronous motor

• D. Brushless DC motor

What is the purpose of the rotor in an induction motor?

• A. To generate the magnetic field

• B. To convert electrical energy into mechanical energy

• C. To conduct electrical current

• D. To provide a mechanical load

Which of the following is not a type of induction motor?

• A. Single-phase induction motor

• B. Three-phase induction motor

• C. DC induction motor

• D. Double squirrel cage induction motor

What is the starting torque of an induction motor?

• A. Zero

• B. Very low

• C. High

• D. Very high

What is the role of the capacitor in a single-phase induction motor?

• A. To generate the magnetic field

• B. To provide a mechanical load

• C. To start the motor

• D. To increase the motor speed

What is the main disadvantage of a squirrel cage induction motor?

• A. Low efficiency

• B. High cost

• C. Low starting torque

• D. High maintenance

Which of the following types of motor has the highest efficiency?

• A. DC motor

• B. AC motor

• C. Stepper motor

• D. Brushless DC motor

What is the main advantage of a three-phase induction motor over a single-phase induction motor?

• A. Higher efficiency

• B. Lower cost

• C. Smaller size

• D. Higher power factor

What is the effect of increasing the frequency on the performance of an induction motor?

• A. Increases the speed

• B. Increases the torque

• C. Decreases the speed

• D. Decreases the torque