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Electrical Machines
Open circuit test on transformer gives
both 1and 2
eddy current loss
copper loss
hysteresis loss
both 1and 2
eddy current loss
copper loss
hysteresis loss
Answer
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Related Question
Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then
wave-wound machine will have more rated current and more voltage
wave-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
wave-wound machine will have more rated current and more voltage
wave-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and less current
lap-wound machine will have more rated voltage and more current
Answer
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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field
in reverse.
to a DC source.
to earth.
to an AC source.
in reverse.
to a DC source.
to earth.
to an AC source.
Answer
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Electrical Machines
The power factor of an induction motor operating at no load will have a value around
unity
0.2 lead
0.2 lag
0.9 lag
unity
0.2 lead
0.2 lag
0.9 lag
Answer
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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of
eddy current losses.
ohmic losses.
mechanical losses.
hysteresis losses.
eddy current losses.
ohmic losses.
mechanical losses.
hysteresis losses.
Answer
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Electrical Machines
What are slot wedges in a DC machine made of?
Silicon steel.
Mild steel.
Fibre.
Cast iron.
Silicon steel.
Mild steel.
Fibre.
Cast iron.
Answer
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