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Electrical Machines
In a DC compound motor the field regulator is provided to
control the armature flux.
control the field flux.
demagnetize the field partially.
limit the armature current.
control the armature flux.
control the field flux.
demagnetize the field partially.
limit the armature current.
Answer
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Related Question
Electrical Machines
In case of 3 - Φ IM, plugging means
pulling the motor directly on line without a rotor.
locking of rotor due to harmonics.
starting the motor on load which is more than the rated load.
interchanging two supply phases for quick stopping.
pulling the motor directly on line without a rotor.
locking of rotor due to harmonics.
starting the motor on load which is more than the rated load.
interchanging two supply phases for quick stopping.
Answer
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Electrical Machines
Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is
1/2.
1/4.
4.
8.
1/2.
1/4.
4.
8.
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
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
there was a break in the armature circuit
there was no residual magnetism in the field circuit
Answer
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Electrical Machines
The synchronous reactance( Xs) is the
reactance either due to armature reaction or leakage flux
reactance due to leakage flux
combined reactance due to armature reaction and leakage flux
reactance due to armature reaction of the machine
reactance either due to armature reaction or leakage flux
reactance due to leakage flux
combined reactance due to armature reaction and leakage flux
reactance due to armature reaction of the machine
Answer
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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.
always closed.
semi closed or semi opened.
none.
always opened.
always closed.
semi closed or semi opened.
none.
always opened.
Answer
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