Understanding DC Motors and Generators

What is the primary function of a DC motor?

• To convert electrical energy into mechanical energy

• To convert mechanical energy into electrical energy

• To store electrical energy

• To regulate voltage

Which component of a DC motor is responsible for reversing the direction of current?

• Stator

• Rotor

• Commutator

• Armature

What is the main difference between a DC motor and a DC generator?

• DC motors have a commutator, while DC generators do not

• DC motors convert electrical energy to mechanical energy, while DC generators do the opposite

• DC motors are larger than DC generators

• DC motors operate at higher voltages than DC generators

In a DC generator, what is the role of the armature?

• To provide a magnetic field

• To convert mechanical energy into electrical energy

• To regulate the output voltage

• To store electrical energy

Which of the following is a common application of DC motors?

• Powering household refrigerators

• Operating electric vehicles

• Generating electricity in power plants

• Running large industrial turbines

What is the unit of measurement for the torque produced by a DC motor?

• Newtons

• Joules

• Newton-metres

• Watts

Which of the following materials is commonly used for the brushes in a DC motor?

• Copper

• Aluminium

• Graphite

• Steel

What is the purpose of the field winding in a DC motor?

• To provide mechanical support

• To create a magnetic field

• To reduce electrical resistance

• To increase rotational speed

In a DC generator, what is the effect of increasing the speed of rotation?

• Decreases the output voltage

• Increases the output voltage

• Has no effect on the output voltage

• Decreases the current output

Which of the following is a disadvantage of DC motors compared to AC motors?

• Higher efficiency

• Simpler construction

• Higher maintenance due to brushes

• Lower initial cost