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Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is
4 percent
10 percent
Zero
2 percent
4 percent
10 percent
Zero
2 percent
Answer
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Related Question
Synchronous Motors
Power factor of a synchronous motor is unity when
The armature current is zero
None of the listed here
The armature current is minimum
The armature current is maximum
The armature current is zero
None of the listed here
The armature current is minimum
The armature current is maximum
Answer
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Synchronous Motors
For power factor correction, synchronous motors operate at
normal load with zero excitation
no-load and under-excited fields
no-load and greatly over-excited fields
normal load with minimum excitation
normal load with zero excitation
no-load and under-excited fields
no-load and greatly over-excited fields
normal load with minimum excitation
Answer
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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is
twice
equal
more
less
twice
equal
more
less
Answer
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Synchronous Motors
An over excited synchronous motor behaves as _____
None of the listed here
A capacitor
A resistor
An inductor
None of the listed here
A capacitor
A resistor
An inductor
Answer
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Synchronous Motors
The shaft of synchronous motor is made of
Chrome steel
Mild steel
Alcino
Stainless steel
Chrome steel
Mild steel
Alcino
Stainless steel
Answer
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