Wound Rotor Construction and Operation Quiz

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Questions and Answers

What is the purpose of the external resistances added to the rotor circuit at starting?

To decrease the motor speed
To increase the rotor circuit current
To reduce the rotor winding resistance
To obtain a high starting torque (correct)

How is the rotor winding of the wound rotor connected?

In star fashion (correct)
In series fashion
In delta fashion
In parallel fashion

What happens to the external resistances as the motor runs up to speed?

They are short-circuited
They are gradually removed from the circuit (correct)
They are disconnected from the slip rings
They are added to the stator winding

What is the role of the carbon brushes in the wound rotor?

To make contact with the slip rings (B) Signup and view all the answers

How does the wound rotor operate once it attains normal speed?

The three carbon brushes are short-circuited (D) Signup and view all the answers

What is the construction of the wound rotor?

The wound rotor consists of a laminated cylindrical core made of silicon steel. Signup and view all the answers

How is the rotor winding of the wound rotor connected?

The rotor winding of the wound rotor is uniformly distributed in the slots and connected in star fashion. Signup and view all the answers

What can be added to the rotor circuit at starting to obtain high starting torque?

External resistances can be added to the rotor circuit at starting to obtain high starting torque. Signup and view all the answers

What is the function of the carbon brushes in the wound rotor?

The carbon brushes rest on the slip rings and allow external resistances to be added to the rotor circuit at starting. They are later short-circuited once the motor attains normal speed. Signup and view all the answers

How does the use of external resistances affect the starting current and starting torque of the motor?

The use of external resistances considerably reduces the starting current and increases the starting torque of the motor. Signup and view all the answers

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