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Electrical Machines
Transformer core is laminated to reduce
copper loss.
both 1 and 2.
eddy current loss.
hysteresis loss.
copper loss.
both 1 and 2.
eddy current loss.
hysteresis loss.
Answer
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Related Question
Electrical Machines
Slip rings of an induction motors are made of
aluminium.
carbon.
stainless steel.
phosphor bronze.
aluminium.
carbon.
stainless steel.
phosphor bronze.
Answer
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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping
Ra minimum and Rf minimum
Rf maximum and Ra minimum
Ra maximum and Rf maximum
Ra maximum and Rf minimum
Ra minimum and Rf minimum
Rf maximum and Ra minimum
Ra maximum and Rf maximum
Ra maximum and Rf minimum
Answer
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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging
armature or field connections.
shunt field connections.
armature connections.
series field connections.
armature or field connections.
shunt field connections.
armature connections.
series field connections.
Answer
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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?
201.02 V.
210 V.
205 V.
212 V.
201.02 V.
210 V.
205 V.
212 V.
Answer
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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?
any of the above
less than
greater than
equal to
any of the above
less than
greater than
equal to
Answer
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