TTL KUIS 03

What are the main components of a DC motor?

• Battery, wires, switch, and resistor

• Stator, rotor, commutator, and brushes

• Capacitor, inductor, diode, and transistor

• Fan, gearbox, shaft, and casing

Explain the working principle of a commutator in a DC motor.

• The commutator increases the speed of the motor

• The commutator reverses the direction of current flow through the armature windings.

• The commutator regulates the voltage in the motor

• The commutator controls the temperature of the motor

Torque-speed characteristics

• Shunt DC Motor

• Series DC Motor

• Compounded DC Motor

• Hysteresis Motor

How does a universal motor operate on both AC and DC supply?

• It uses a commutator and brushes to reverse the direction of current flow through the armature windings.

• It uses a permanent magnet to generate the magnetic field

• It uses a capacitor to store the AC power and convert it to DC

• It uses a transformer to convert the AC to DC

Types of starting and running characteristics of induction motor, except

• Shaded-pole

• Split-phase

• Capacitor-start

• Reluctance

What is the operating principle of a hysteresis motor?

• Friction loss in the motor

• Hysteresis loss in the magnetic material

• Eddy current loss in the motor

• Voltage drop in the motor

What are the key characteristics of a stepper motor?

• High torque at high speeds, and require feedback sensors

• Precise position control, high torque at low speeds, and do not require feedback sensors

• Inaccurate position control, low torque at high speeds, and require feedback sensors

• Low torque at low speeds, and require feedback sensors

Torque-speed characteristics of a Hysteresis Motor

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