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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be
0.06 Ω.
0.01 Ω.
0.54 Ω.
0.54 Ω.
0.06 Ω.
0.01 Ω.
0.54 Ω.
0.54 Ω.
Answer
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Related Question
Electrical Machines
Rotating magnetic field is produced in an induction motor because of
None of these
rotor winding.
stator winding.
either stator winding or rotor winding.
None of these
rotor winding.
stator winding.
either stator winding or rotor winding.
Answer
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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?
Inserting an additional resistance in the field circuit.
Inserting resistance to armature circuit and field circuit.
Inserting an additional resistance in the armature circuit.
Any of above.
Inserting an additional resistance in the field circuit.
Inserting resistance to armature circuit and field circuit.
Inserting an additional resistance in the armature circuit.
Any of above.
Answer
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Electrical Machines
In a DC generator if field winding attains the critical resistance
machine will generate maximum power.
the voltage generated will be zero.
field winding will burn.
machine will generate maximum voltage.
machine will generate maximum power.
the voltage generated will be zero.
field winding will burn.
machine will generate maximum voltage.
Answer
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Electrical Machines
For larger units high torque it is preferred to use
Universal motor.
Slip induction motor.
Partial motor.
DC shunt motor.
Universal motor.
Slip induction motor.
Partial motor.
DC shunt motor.
Answer
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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?
By varying number of poles.
Both (A) and (B).
By varying the supply frequency.
By varying supply voltage.
By varying number of poles.
Both (A) and (B).
By varying the supply frequency.
By varying supply voltage.
Answer
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