Electrical Machines Physical Concepts Synchronous Machine Operation Online Exam Quiz
Electrical Machines Physical Concepts Synchronous Machine Operation GK Quiz. Question and Answers related to Electrical Machines Physical Concepts Synchronous Machine Operation. MCQ (Multiple Choice Questions with answers about Electrical Machines Physical Concepts Synchronous Machine Operation
If the 3-phase alternator has 4 poles and has synchronous speed of 120 rad/s. Then the mechanical speed in rad/sec is?
Options
A : 60
B : 240
C : 120
D : 30
A poly phase synchronous motor will be used for the load of ______ over poly phase induction motor.
Options
A : 600 kW 500 rpm
B : 600 kW 1500 rpm
C : 600 kW 3500 rpm
D : 600 kW 1200 rpm
The power load angle characteristic as maximum for a load angle of __________
Options
A : 90°
B : 45°
C : more than 90°
D : 180°
Floating of synchronous machine on infinite bus means ___________
Options
A : Fa = 0 and machine neither generator nor motor
B : Fa is not zero and machine neither generator nor motor
C : Fa = 0 and machine is not excited
D : frequency is zero
If the field poles are ahead of resultant mmf, then the 3-phase synchronous machine is operating as ___________
Options
A : generator
B : motor
C : reluctance motor
D : any of the mentioned
During the starting of the 3-phase synchronous motor by damper bars, the field winding is usually short circuited so that starting torque is equal to __________
Options
A : induction motor torque plus an additional torque produced by short circuited field winding
B : induction motor torque
C : electromagnetic torque
D : reluctance torque due to rotor saliency
If the synchronous machine is loaded from floating conditions, the alternator begins to operate at __________
Options
A : leading p.f
B : lagging p.f
C : unity p.f
D : zero p.f
If the synchronous machine is loaded from floating conditions, the synchronous motor begins to operate at __________
Options
A : leading p.f
B : lagging p.f
C : unity p.f
D : zero p.f
To start the synchronous motor, its field winding should be __________
Options
A : short circuited
B : kept open
C : connected to dc excitation source
D : any of the mentioned
At steady state operation in a 3-phase synchronous generator. (where Tem is developed electromagnetic torque developed in the machine and Tpm is the prime mover torque.)
Options
A : Tem = Tpm
B : Tem > Tpm
C : Tem < Tpm
D : can not be coupled
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