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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?
primary = 301 A, secondary = 22.7 A
primary = 22.7 A, secondary = 602.4 A
primary = 602 A, secondary = 22.7 A
primary = 11.4 A, secondary = 301 A
primary = 301 A, secondary = 22.7 A
primary = 22.7 A, secondary = 602.4 A
primary = 602 A, secondary = 22.7 A
primary = 11.4 A, secondary = 301 A
Answer
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Related Question
Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because
dc machines are comparatively low rating machines.
it gives more uniform air-gap flux distribution
commutator action is not possible otherwise
it reduces field structure iron losses
dc machines are comparatively low rating machines.
it gives more uniform air-gap flux distribution
commutator action is not possible otherwise
it reduces field structure iron losses
Answer
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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be
steady and unidirectional
oscillating
pulsating and unidirectional
None of these
steady and unidirectional
oscillating
pulsating and unidirectional
None of these
Answer
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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called
resonance.
crawling.
cogging.
harmonics.
resonance.
crawling.
cogging.
harmonics.
Answer
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Electrical Machines
In synchronous generator, inverted V curve is drawn between
field current on Y-axis and power factor on X-axis
field current on X-axis and armature current on Y-axis
field current on Y-axis and armature current on X-axis
field current on X-axis and power factor on Y-axis
field current on Y-axis and power factor on X-axis
field current on X-axis and armature current on Y-axis
field current on Y-axis and armature current on X-axis
field current on X-axis and power factor on Y-axis
Answer
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Electrical Machines
Compensating windings are used in DC generators
to provide path for the circulation of cooling air.
mainly to reduce the eddy currents by providing local short circuit.
None of these
to neutralize the cross magnetizing effect of the armature reaction.
to provide path for the circulation of cooling air.
mainly to reduce the eddy currents by providing local short circuit.
None of these
to neutralize the cross magnetizing effect of the armature reaction.
Answer
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