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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be
36.
18.
50.
80.
36.
18.
50.
80.
Answer
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Related Question
Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)
remain the same as the original
changes to three times the original value
changes to 1.5 times the original value
changes to 0.5 times the original value
remain the same as the original
changes to three times the original value
changes to 1.5 times the original value
changes to 0.5 times the original value
Answer
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Electrical Machines
No load saturation characteristics are plotted between
no load voltage and field current
short circuit current and field current
short circuit current and armature current
no load voltage and armature current
no load voltage and field current
short circuit current and field current
short circuit current and armature current
no load voltage and armature current
Answer
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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is
1.
0.7.
0.3.
0.54.
1.
0.7.
0.3.
0.54.
Answer
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Electrical Machines
Which of the following motors has negative speed regulation?
Shunt motors.
Series motors.
Differential compound motors.
Both B and C.
Shunt motors.
Series motors.
Differential compound motors.
Both B and C.
Answer
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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is
None of these
AC.
both of above.
DC.
None of these
AC.
both of above.
DC.
Answer
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