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Electrical Machines
In DC machine yoke offers
produce working flux
both A and B
mechanical protection to the machine
flux path completion
produce working flux
both A and B
mechanical protection to the machine
flux path completion
Answer
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Related Question
Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are
zero, 950 rpm.
zero , - 50 rpm.
1000 rpm, 950 rpm.
1000 rpm, - 50 rpm.
zero, 950 rpm.
zero , - 50 rpm.
1000 rpm, 950 rpm.
1000 rpm, - 50 rpm.
Answer
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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
460 V
65 V
115 V
230 V
460 V
65 V
115 V
Answer
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Electrical Machines
An induction motor is, in general analogous to
two winding transformer with secondary short circuited.
two winding transformer with secondary open circuited.
None of these
auto transformer.
two winding transformer with secondary short circuited.
two winding transformer with secondary open circuited.
None of these
auto transformer.
Answer
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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
there was a break in the armature circuit
there was no residual magnetism in the field circuit
field winding was wrongly connected
field resistance was higher than critical resistance
there was a break in the armature circuit
there was no residual magnetism in the field circuit
field winding was wrongly connected
field resistance was higher than critical resistance
Answer
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Electrical Machines
Where the shunt generators are widely used?
Where often load fluctuation is occurred.
Where the load is very high.
Where a constant voltage is required over a narrow load range.
Where voltage variation is needed over a wide load range.
Where often load fluctuation is occurred.
Where the load is very high.
Where a constant voltage is required over a narrow load range.
Where voltage variation is needed over a wide load range.
Answer
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