Question

4. What is the function of the damper winding of a three-phase synchronous motor/ a) For starting b) For starting and power factor correction c) To maintain synchronous speed d) For excitation 5. For which one of the following applications are synchronous motors often used? a) Variable speed b) Constant speed c) Frequent starting d) They are used to reduce the power factor 6. How is the rotation of a three-phase wound rotor motor reversed? a) Shifting the brushes on the commutators b) Reversing two wires from the wound rotor c) Reversing two wires connected to the stator field d) Reversing the current in the variable resistors

          4. What is the function of the damper winding of a three-phase synchronous motor/
a) For starting
b) For starting and power factor correction
c) To maintain synchronous speed
d) For excitation
5. For which one of the following applications are synchronous motors often used?
a) Variable speed
b) Constant speed
c) Frequent starting
d) They are used to reduce the power factor
6. How is the rotation of a three-phase wound rotor motor reversed?
a) Shifting the brushes on the commutators
b) Reversing two wires from the wound rotor
c) Reversing two wires connected to the stator field
d) Reversing the current in the variable resistors

4. What is the function of the damper winding of a three-phase synchronous motor/
a) For starting
b) For starting and power factor correction
c) To maintain synchronous speed
d) For excitation
5. For which one of the following applications are synchronous motors often used?
a) Variable speed
b) Constant speed
c) Frequent starting
d) They are used to reduce the power factor
6. How is the rotation of a three-phase wound rotor motor reversed?
a) Shifting the brushes on the commutators
b) Reversing two wires from the wound rotor
c) Reversing two wires connected to the stator field
d) Reversing the current in the variable resistors

Added by Eric L.

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