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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
230 V
65 V
460 V
115 V
230 V
65 V
460 V
115 V
Answer
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Related Question
Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because
field resistance was higher than critical resistance
there was a break in the armature circuit
field winding was wrongly connected
there was no residual magnetism in the field circuit
field resistance was higher than critical resistance
there was a break in the armature circuit
field winding was wrongly connected
there was no residual magnetism in the field circuit
Answer
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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?
In case of any sparking they will be less damaged than copper brushes
They are not hard as copper brush
All of these
They are self lubricating in nature
In case of any sparking they will be less damaged than copper brushes
They are not hard as copper brush
All of these
They are self lubricating in nature
Answer
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Electrical Machines
Under commutation results in
sparking at the leading edge of the brush.
no sparking.
sparking the trailing edge of the brush.
sparking at the middle of the brush.
sparking at the leading edge of the brush.
no sparking.
sparking the trailing edge of the brush.
sparking at the middle of the brush.
Answer
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Electrical Machines
The slip of an induction motor during DC rheostatic braking is
1 - s.
2 + s.
2 - s.
s.
1 - s.
2 + s.
2 - s.
s.
Answer
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Electrical Machines
In double cage induction motor, the outer cage offers
high resistance and low reactance.
low resistance and low reactance.
high resistance and high reactance.
low resistance and high reactance.
high resistance and low reactance.
low resistance and low reactance.
high resistance and high reactance.
low resistance and high reactance.
Answer
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