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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is
0.08 pu.
0.01 pu.
0.16 pu.
0.02 pu.
0.08 pu.
0.01 pu.
0.16 pu.
0.02 pu.
Answer
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Related Question
Electrical Machines
Reversing the direction of rotation of split phase motors is done by
reversing the terminals of main winding.
interchanging the capacitor from starting winding to main winding or vice versa.
All of these
reversing the terminals of starting winding.
reversing the terminals of main winding.
interchanging the capacitor from starting winding to main winding or vice versa.
All of these
reversing the terminals of starting winding.
Answer
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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of
Field current.
Line current.
Armature current.
None of above.
Field current.
Line current.
Armature current.
None of above.
Answer
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Electrical Machines
To avoid formation of grooves in the commutator
the brushes of same polarity should track each other.
the brushes of opposite polarity should track each other.
brush position has no effect on the commutator grooving.
None of these
the brushes of same polarity should track each other.
the brushes of opposite polarity should track each other.
brush position has no effect on the commutator grooving.
None of these
Answer
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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is
interpole and compensating windings together
interpole winding
armature winding
field winding
interpole and compensating windings together
interpole winding
armature winding
field winding
Answer
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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will
run at very low speed.
start haunting.
run at very high speed.
burn.
run at very low speed.
start haunting.
run at very high speed.
burn.
Answer
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