Starting methods of DC motors

What are the two main types of DC motors?

• Brushed DC motors and Brushless DC motors

• AC motors and Stepper motors

• Hydraulic motors and Pneumatic motors

• Servo motors and Linear motors

Name one application where a series DC motor is commonly used.

• Electric vehicles

• Smartphones

• Airplanes

• Toaster ovens

What is the working principle of a DC motor?

• Friction between gears and shafts

• Chemical reaction between electrodes

• Sound waves produced by the motor

• Interaction between current-carrying conductor and magnetic field

Explain how a brushed DC motor works.

• The commutator and brushes continuously switch the direction of current flow through the motor's windings.

• The motor operates by using a series of magnets to generate electricity

• The motor's speed is controlled by the amount of voltage applied to the brushes

• The commutator and brushes are used to regulate the temperature of the motor

What are the advantages of using a DC motor?

• Low cost, lack of speed control, short lifespan

• Inefficiency, lack of speed control, short lifespan

• Efficiency, speed control, and long lifespan

• High cost, low speed, short lifespan

How does a DC motor's speed vary with the load?

• Speed remains constant

• Speed decreases

• Speed increases

• Speed fluctuates

Name one disadvantage of using a DC motor.

• They are not suitable for high-speed applications

• They are very expensive

• They are not energy efficient

• One disadvantage of using a DC motor is the requirement for regular maintenance and brush replacement.

Explain why brushless DC motors are more efficient than brushed DC motors.

• Brushless DC motors have more friction and wear due to the absence of brushes.

• Brushless DC motors are less efficient because they have brushes that cause energy loss.

• Brushless DC motors require more energy to operate than brushed DC motors.

• Brushless DC motors do not have brushes that cause friction and wear, resulting in less energy loss.

What is one drawback of using permanent magnets in a DC motor?

• Unlimited speed and torque control

• No effect on motor performance

• Limited speed and torque control

• Easily replaceable

How does the commutator in a DC motor contribute to its operation?

• It helps to reverse the direction of current flow in the armature windings.

• It helps to increase the speed of the motor

• It has no impact on the operation of the motor

• It helps to generate electricity for the motor