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Electrical Machines
Voltage regulation of transformer is given by
(E2 - V2) / V2
(V2 - E2) / V2
(E2 - V2) / E2
(V2 - E2) / E2
(E2 - V2) / V2
(V2 - E2) / V2
(E2 - V2) / E2
(V2 - E2) / E2
Answer
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Related Question
Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that
Eb is unchanged, but Td is zero
both Eb and Td are unchanged
Eb is zero, but Td is unchanged
both Eb and Td are zero
Eb is unchanged, but Td is zero
both Eb and Td are unchanged
Eb is zero, but Td is unchanged
both Eb and Td are zero
Answer
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Electrical Machines
Rotor resistance speed control is used in
synchronous motor.
slip ring induction motor.
squirrel cage induction motor.
dc shunt motor.
synchronous motor.
slip ring induction motor.
squirrel cage induction motor.
dc shunt motor.
Answer
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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)
T∝ P²
T∝ P³
T∝ P
T is independent of P
T∝ P²
T∝ P³
T∝ P
T is independent of P
Answer
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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.
220 volt.
240 volt.
230 volt.
440 volt.
220 volt.
240 volt.
230 volt.
440 volt.
Answer
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Electrical Machines
Commonly used starters of cage motor is
star delta.
both A and B.
None of these
DOL.
star delta.
both A and B.
None of these
DOL.
Answer
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