Electrical Machines Synchronous Motor Phasor Diagram Online Exam Quiz
Electrical Machines Synchronous Motor Phasor Diagram GK Quiz. Question and Answers related to Electrical Machines Synchronous Motor Phasor Diagram. MCQ (Multiple Choice Questions with answers about Electrical Machines Synchronous Motor Phasor Diagram
The voltage equation of synchronous motor is?
Options
A : Ef = Vt + Ia*(ra+jXa)
B : Ef = Vt – Ia*(ra+jXa)
C : Ef = Vt + Ia*(ra-jXa)
D : Ef = Vt – Ia*(ra-jXa)
We can increase the torque of a reluctance synchronous motor if we __________
Options
A : Increase reluctance of the magnetic circuit along the direct axis
B : Decrease the reluctance of the magnetic circuit along the quadrature axis
C : Increase the ratio of the quadrature axis reluctance to direct axis reluctance
D : Decrease the ratio of quadrature axis reluctance to direct axis reluctance
Synchronous motor delivers lagging power at __________
Options
A : leading pf
B : lagging pf
C : zero pf
D : unity pf
The zero power factor of an alternator can be obtained by _________ at rated Ia.
Options
A : over exciting
B : conducting short circuit of secondary terminals
C : under excitation
D : running as reluctance motor
Switched reluctance motors are basically __________
Options
A : salient pole synchronous motor but without excitation winding
B : stepper motor with salient poles
C : synchronous motor with salient poles on stator and rotor
D : stepper motor with closed loop control and with rotor position sensor
From the figure shown below for the OCC and SCC of a three phase alternator, the point ‘L’ corresponds to _______ and the point ‘A’ can be obtained by _____ the alternator.
Options
A : terminal voltage, over exciting
B : excitation voltage, over exciting
C : terminal voltage, under exciting
D : excitation voltage, under exciting
The operating point for an over excited alternator working near zpf lagging power factor gives ‘A’ as the operating point. Then if the same machine is working as an over excited synchronous motor will give same operating point at __________
Options
A : zpf leading
B : zpf lagging
C : upf
D : there will never be the same operating point for the machine as motor as well as generator
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