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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 any of the above
 hyperbola
 linearised
 parabola

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.75 Hz.
 0.70 Hz.
  0.65 Hz.
  60 Hz.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 none of above
 both A and B
 shunt field
 armature circuit

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Electrical Machines
Swinburne's test is applicable to

 DC series motor.
 DC compound motor.
 DC Shunt motor.
 DC shunt and level Compound motor.

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Electrical Machines
Induction motor operation depends on

 rotating magnetic field.
None of these
 stationary magnetic field.
 either of these.

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 < I2
 I1 > I2
None of these
 I1 = I2

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MORE MCQ ON Electrical Machines

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