Electrical Machines Multiple Choice Online Exam Quiz
Electrical Machines Multiple Choice GK Quiz. Question and Answers related to Electrical Machines Multiple Choice. MCQ (Multiple Choice Questions with answers about Electrical Machines Multiple Choice
For a 4-pole 3 phase, 400V alternator has synchronizing power of 300 units. Then the synchronizing power per mechanical degree is?
Options
A : 300
B : 1200
C : 900
D : 600
Variation in the dc excitation of a synchronous motor causes variation in ___________
Options
A : armature current and power factor
B : power factor
C : armature current
D : speed
Electromagnetic torque is present in rotating machines when ____________
Options
A : both stator and rotor windings carry current
B : rotor windings carry current
C : stator windings carry current
D : any of the mentioned
Which of the following is/are used in synchronous machines to maintain mechanical stability?
Options
A : Damper winding
B : Interpole winding
C : Compensating winding
D : Equalizer rings
Which of the following makes synchronizing power to come to play in the machine?
Options
A : Disturbance in power mover
B : Disturbance in field current
C : Disturbance in load
D : All of the mentioned
The operation of a synchronous motor operating on constant excitation across infinite bus will not be stable if power angle ??
Options
A : exceeds internal angle ?
B : is less than ?
C : is more than ?/2
D : is less than ?/2
Large stiffness coefficient represents ____________
Options
A : motor speed remains practically constant
B : large fluctuations due to mechanical load
C : motor speed is variable to changes
D : no such significance with speed
As load angle is increased, degree of stability __________
Options
A : reduces
B : increases
C : remains same
D : no change in stability
The coupling angle or load angle of a synchronous motor is defined as the space angle between __________
Options
A : rotor and stator poles of opposite polarity
B : rotor and stator poles of same polarity
C : rotor and stator teeth
D : rotor and resultant magnetic field
In a synchronous motor the back emf peak set up in the stator depends on ___________
Options
A : rotor excitation
B : supply voltage
C : rotor speed
D : load on the motor
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