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Electrical Machines
What is the actual arrangement of series wound generator?
Armature and field both are connected.
Armature winding is in series with load.
Armature and field both are in series with the load.
Armature and field both are parallel.
Armature and field both are connected.
Armature winding is in series with load.
Armature and field both are in series with the load.
Armature and field both are parallel.
Answer
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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?
By varying the supply frequency.
By varying supply voltage.
Both (A) and (B).
By varying number of poles.
By varying the supply frequency.
By varying supply voltage.
Both (A) and (B).
By varying number of poles.
Answer
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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?
None of these
Zener diode shunt regulator.
Transistor shunt regulator.
Transistor series regulator.
None of these
Zener diode shunt regulator.
Transistor shunt regulator.
Transistor series regulator.
Answer
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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?
None of these
pure inductive load
pure capacitive load
pure resistive load
None of these
pure inductive load
pure capacitive load
pure resistive load
Answer
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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be
460 V
65 V
230 V
115 V
460 V
65 V
230 V
115 V
Answer
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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have
smoother acceleration.
reduced starting current.
more starting time.
more starting torque.
smoother acceleration.
reduced starting current.
more starting time.
more starting torque.
Answer
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