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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -2 < S < 2
 0 < S < 1
 -1 < S < 1
 0 < S < 2

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Electrical Machines
The slot edges in a DC machine are made of

  Fibre.
 Silicon steel.
 Cast iron.
 Mild steel.

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide overload protection.
 provide protection against Low-Voltage.
 all of above.
 limit the starting current to a safer value.

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Electrical Machines
During hunting of a synchronous motor

  field excitation increases.
  harmonic are developed in the armature circuit.
  negative phase sequence currents are generated.
  damper bar develops torque.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the shunt field
 in parallel with the series field
 in parallel with the shunt field
 in series with the series field

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 30 W.
 25 W.
 28 W.

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