Electrical Machines Power Factor Control Synchronous Machines Online Exam Quiz
Electrical Machines Power Factor Control Synchronous Machines GK Quiz. Question and Answers related to Electrical Machines Power Factor Control Synchronous Machines. MCQ (Multiple Choice Questions with answers about Electrical Machines Power Factor Control Synchronous Machines
For a synchronous motor, mark the appropriate.
Options
A : A-Inductor, B-Capacitor
B : A-Capacitor, B-Resistor
C : A-Inductor, B-Inductor
D : A-Capacitor, B-Inductor
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
A 3 phase synchronous motor is working at normal excitation, then the flux deficient in circuit is ________
Options
A : given by armature winding mmf
B : given by field winding mmf
C : supplied to armature winding mmf
D : supplied to field winding mmf
The V-curves of synchronous motor is plotted between ________
Options
A : Ia Vs If with constant shaft load
B : If Vs Ia with constant shaft load
C : power factor vs If
D : power factor vs Ia
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
The active power delivered by an alternator will _______ when the prime mover input is increased for the alternator connected to infinite bus bar.
Options
A : increases
B : decreases
C : remains constant
D : no relation exists between the power and prime mover droop characteristic
The operating frequency and voltage of an isolated alternator ________ if the prime mover input to motor is increased.
Options
A : increases
B : decreases
C : remains constant
D : no relation exists between the power and frequency
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 than motor at lagging power factor.
Options
A : minimum
B : maximum
C : zero
D : none of the mentioned
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