Related Questions

A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
A remain same
B go down
C improve
D none of the above
The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as
A slip torque
B pull-out torque
C breaking torque
D synchronising torque
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as
A locked-rotor torque
B synchronous torque
C pull up torque
D reluctance torque
The ratio of starting torque to running torque in a synchronous motor is
A zero
B one
C two
D infinity
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
A induction motor torque in field winding
B induction motor torque in damper winding
C eddy current and hysteresis torque in pole faces
D reHetance motor torque due to saliency of the rotor
E all of the above methods
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop
A inductor motor torque
B induction generator torque
C synchronous motor torque
D d.c. motor toque
Insertion of resistance in the rotor of an induction motor to develop a given torque
A Decreases the rotor current
B Increases the rotor current
C Rotor current becomes zero
D Rotor current remains same
Insertion of resistance in the rotcir of an induction motor to develop a given torque
A decreases the rotor current
B increases the rotor current
C rotor current becomes zero
D rotor current rernains same
A synchronous motor can be used as a synchronous capacitor when it is
A under-loaded
B over-loaded
C under-excited
D over-excited
In a synchronous motor, the breakdown torque is
A directly proportional to applied voltage
B directly proportional to the square of the applied voltage
C inversely proportional to applied voltage
D none of the above

Next steps