2.3 EM

1. What is the main principle of operation of a DC motor?

• 1. a) Electromagnetic induction

• 1. b) Faraday's law of electromagnetic induction

• 1. c) Fleming's left-hand rule

• 1. d) Lenz's law

3. Which type of DC motor provides a constant speed regardless of the load?

• 3. a) Series motor

• 3. b) Shunt motor

• 3. c) Compound motor

• 3. d) Universal motor

5. In a DC motor, back electromotive force (EMF) is directly proportional to:

• 5. a) Armature current

• 5. b) Armature resistance

• 5. c) Armature voltage

• 5. d) Speed of the motor

9. In a DC motor, the torque developed is directly proportional to:

• 9. a) Armature current

• 9. b) Armature resistance

• 9. c) Armature voltage

• 9. d) Speed of the motor

10. Which of the following is an advantage of a DC motor compared to an AC motor?

• 10. a) Higher efficiency

• 10. b) Lower maintenance requirements

• 10. c) Simpler construction

• 10. d) Greater reliability