Electric Motor Types and Starting Mechanisms Quiz

Universal motors are commonly used in household appliances due to their compact size and ability to operate on both AC and DC power.

Centrifugal switches are typically used for single-phase induction motors to disconnect the starting winding once the motor reaches a certain speed.

A 'thermal motor' is not a recognized type of electric motor; it likely refers to a motor driven by thermal expansion, which is not commonly used.

The primary difference between an AC motor and a DC motor is their power source: AC motors operate on alternating current, while DC motors operate on direct current.

Induction motors are commonly used in ceiling fans and washing machines due to their simplicity, reliability, and ability to operate on AC power.

Synchronous motors are commonly used in electric vehicles (EVs) due to their efficiency, ability to operate at high speeds, and precise speed control.

Brushless DC motors (BLDC) offer higher efficiency compared to brushed DC motors due to the absence of brushes, reducing friction and wear.

Stepper motors are preferred for applications requiring precise speed control because they move in discrete steps, allowing accurate positioning.

The commutator in a DC motor ensures continuous flow of current in the armature coils by reversing the direction of current at appropriate times.

A characteristic of a permanent magnet synchronous motor (PMSM) is that it operates at synchronous speed, where the rotor speed matches the rotating magnetic field.

The starting capacitor in a single-phase induction motor increases the starting torque by providing a phase shift, aiding in motor rotation during startup.

The main advantage of a stepper motor over a DC motor is its precise position control, achieved by moving in discrete steps, making it suitable for applications requiring accurate positioning.

The capacitor in a capacitor start induction run (CSIR) motor provides a phase shift to create a starting torque necessary for motor rotation.

The primary disadvantage of a wound rotor induction motor compared to a squirrel cage induction motor is its more complex construction, including additional external resistors and slip rings.

If the load exceeds the pullout torque in a synchronous motor, the motor stalls, resulting in a loss of synchronization with the power supply.

The primary disadvantage of a reluctance motor is its limited speed range, which can restrict its applicability in certain high-speed applications.

Capacitor-start induction motors are preferred for applications requiring high starting torque and low starting current due to the additional starting capacitor which provides increased torque during startup.

The centrifugal switch in a single-phase induction motor disconnects the starting winding once the motor reaches a certain speed, preventing overheating and damage.