Electrical Machines Starting Synchronous Motors Online Exam Quiz
Electrical Machines Starting Synchronous Motors GK Quiz. Question and Answers related to Electrical Machines Starting Synchronous Motors. MCQ (Multiple Choice Questions with answers about Electrical Machines Starting Synchronous Motors
Power factor of a synchronous motor varies when the ___________
Options
A : applied voltage is varied
B : load is changed
C : supply frequency and field excitation is changed
D : all of the mentioned
The reactive power output of a synchronous generator is limited by ___________
Options
A : armature current and field current
B : field current and load angle
C : load angle and prime mover input
D : armature current and prime mover input
A synchronous machine is operating at constant load and at unity power factor. If its excitation is increased, then it operates as ___________
Options
A : generator at lagging p.f
B : motor at lagging p.f
C : absorber of reactive power
D : generator at leading p.f
Auxiliary method of starting is not possib1e due to the fact that ____________
Options
A : it can not be started under load
B : it can be only started under load
C : it is less efficient
D : all of the mentioned
A synchronous machine is operating at constant load and at unity power factor. If its excitation is increased and then it operates as ___________
Options
A : motor at leading p.f
B : motor at lagging p.f
C : absorber of reactive power
D : generator at leading p.f
Synchronous motors are ___________
Options
A : not self starting
B : self starting
C : single excited
D : none of the mentioned
A 3-phase, 400V, synchronous motor is providing load at 0.8 p.f. lagging. If the field current of the motor is continuously increased, then the _____________
Options
A : power factor increases and then decreases
B : power factor is not affected
C : power factor decreases upto a certain value of field current and then increases
D : power facor increases simply
These days alternators are designed to have larger air gaps for __________
Options
A : stable parallel operation
B : higher stability limit
C : sinusoidal mmf distribution
D : all of the mentioned
A synchronous machine with its field winding on stator and polyphase armature winding on rotor. At steady state, which of the following is not true for its air gap field?
Options
A : stationary w.r.t. stator
B : rotating at double the speed Ns w.r.t. rotor
C : rotating in direction opposite to rotor
D : rotating at Ns w.r.t. rotor
In a 3-phase cylindrical-rotor alternator, synchronous reactance is sum of mutual and leakage reactance.
Options
A : True
B : False
C :
D :
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