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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 supply voltage V
 V²
 1/V

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The voltage across the terminals.
 The speed of motor.
 None of above.
 The torque required.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the square of armature current.
 Inversely proportional to the armature current.
 None of above.
 Proportional to the armature current.

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Electrical Machines
In escalator which motor is used?

  3 - φ IM.
  DC shunt motor.
  1 - φ IM.
  Universal motor.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to reduce the insulation of materials.
 in order to reduce eddy current to provide large flux.
 to provide large flux.
 as it carries large load current.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 large and thick
 less and thin
 large and thin

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