Short quiz to check your understanding of synchronous generator

Which of the following descriptions is appropriate for the stator of a synchronous machine?

• The stator contains three armature windings (one winding per phase) distributed around the stator

• The stator contains the field winding.

What is the synchronous speed of a 6 pole, 60 Hz machine (in rpm)?

• 1200 rpm

• 1000 rpm

• 1800 rpm

• 600 rpm

The image shown below is the equivalent circuit of a synchronous machine. E_f -> induced voltage owing to rotor field flux V_t -> terminal voltage I_a -> armature current X_s -> armature reactance

• True

• False

Which of the following tests are used to find the synchronous reactance of a synchronous generator?

• Open circuit test

• Equivalent resistance test

• Blocked rotor test

• Short circuit test

For synchronous motor operation the current exits the machine terminals.

• True

• False

Maximum torque occurs at an angle of how many degrees? Beyond this angle the machine will loose synchronism.

• 90 degrees

• 60 degrees

• 120 degrees

• 45 degrees