Electrical Machines Power Factor Correction Synchronous Motors Online Exam Quiz
Electrical Machines Power Factor Correction Synchronous Motors GK Quiz. Question and Answers related to Electrical Machines Power Factor Correction Synchronous Motors. MCQ (Multiple Choice Questions with answers about Electrical Machines Power Factor Correction Synchronous Motors
The excess flux in synchronous motor is neutralized by ________
Options
A : armature winding by drawing demagnetizing component of the current from ac supply
B : armature winding by drawing magnetizing component of the current from ac supply
C : field winding by drawing demagnetizing component of the current from dc supply
D : field winding by drawing magnetizing component of the current from dc supply
When a constant power output is desired to maintain ________
Options
A : Ef*sin? and Ia*cos? are to be maintained constant
B : Ef*sin? is be maintained constant
C : Ia*cos? is to be maintained constant
D : Ef*sin? and Ia*sin? are to be maintained constant
For a power system having induction motor loads, an overexcited synchronous motor is also attached. Then the over all power factor?
Options
A : improves
B : degrades
C : becomes upf
D : remains same
For a power system having induction motor loads, an overexcited synchronous motor is also attached. The induction motor will now operate at ________
Options
A : lagging
B : leading
C : reduced power factor
D : increased power factor
The armature current is ________ at UPF when compared to leading power factor.
Options
A : minimum
B : maximum
C : equal
D : none of the mentioned
When the excitation voltage is increased from 1 to 1.3 pu of a 3-phase synchronous motor. Then load angle for the constant power operation ________
Options
A : must be decreased
B : can also be increased
C : increased
D : decreased
Synchronous compensators are ________
Options
A : over excited synchronous motor with no mechanical load
B : over excited synchronous motor with mechanical load
C : under excited synchronous motor with no mechanical load
D : normally excited synchronous motor with no mechanical load
The inverted V plots is plotted between ________
Options
A : power factor vs field current for constant shaft load
B : field current vs power factor for variable shaft load
C : armature current vs field current
D : terminal voltage vs power factor
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