Electrical Engineering XYZ MCQs
Which of the following starter is sufficient to start the DC series motor:
- 2 point starter
- 3 point starter
- 4 point starter
- All of the above
Correct answer: 1. 2 point starter
Explanation:
- 2 Point Starter:
- A 2 point starter is suitable for starting a DC series motor.
- It consists of two main parts: a resistance and a switch. The resistance is connected in series with the armature during starting to limit the initial high current drawn by the motor.
- As the motor gains speed and back electromotive force (EMF) increases, the resistance is gradually reduced until it is completely shorted out. This allows the motor to operate at full speed with minimum current.
- 3 Point Starter:
- A 3 point starter is typically used for DC shunt and compound motors, not for series motors.
- It includes three terminals: one for the armature, one for the field winding, and one common terminal. The field winding is connected in series with the armature during starting.
- 4 Point Starter:
- A 4 point starter is used for large DC motors, and it includes four terminals: two for the armature and two for the field winding.
- Like the 3 point starter, it is not specifically designed for DC series motors.
- All of the Above:
- This option is not correct because both the 3 point starter and the 4 point starter are not specifically designed for DC series motors. The 2 point starter is the most suitable for starting a DC series motor.
In summary, the 2 point starter is the appropriate choice for starting a DC series motor due to its design that effectively limits the initial high current during startup.