Electrical Machines Equivalent Circuit Online Exam Quiz
Electrical Machines Equivalent Circuit GK Quiz. Question and Answers related to Electrical Machines Equivalent Circuit. MCQ (Multiple Choice Questions with answers about Electrical Machines Equivalent Circuit
The electrical anlogous of the mechanical load in the induction machine is given by?
Options
A : (r2)*(1-s)/s
B : (r2)
C : (r2)/s
D : (r2)/(1-s)
If it is desired to approximate the efficiency of an induction motor operating at slip ‘s’, then its efficiency is given by?
Options
A : 1-s/1+s
B : 1/1+s
C : s/s+1
D : s/1-s
A star connected capacitor bank is connected to the induction motor having capacitance C and VA rating as VAs. If the capacitor bank is replaced by a delta bank then?
Options
A : C = C/3, VA = VAs
B : C = 3C, VA = VAs
C : C = C, VA = VAs/3
D : C = C/3, VA = VAs/3
Rc in the below circuit represents?
Options
A : core loss of induction motor
B : no load losses of induction motor
C : iron losses of induction motor
D : copper losses of induction motor
A 3-phase induction machine is running at super synchronous speed. For the machine to be self excited it _________
Options
A : draws reactive power from mains
B : draws real power from mains
C : feeds reactive power to mains
D : generates emf by gradual voltage build up
The leakage reactances are less than their values at the full load operating conditions. Why?
Options
A : Due to large inrush current during starting
B : Due to very low saturation
C : Due to speed is not same as synchronous speed
D : All of the mentioned
In a 3-phase induction generator which is self excited, load has been increased. To keep the frequency of the generated voltage constant, speed of the induction machine should be _________
Options
A : increased
B : decreased
C : maintained less than rated synchronous speed
D : maintained more than rated synchronous speed
Induction generators will deliver power at _________
Options
A : leading p.f.
B : lagging p.f.
C : unity p.f.
D : zero p.f.
A delta connected capacitance bank is preferred over a star connected bank. This is done to ensure _________
Options
A : lesser capacitance
B : easy calculation
C : easier connection
D : all of the mentioned
The actual rotor resistance referred to the stator if the induction motor is?
Options
A : r2
B : (r2)/s
C : (r2)/(1-s)
D : (r2)*(1-s)/s
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