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Electrical Machines

Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 5 - 10 F.
  1 - 2 µF.
  2 - 3 µF.
 0.1 µF.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  transposing any two leads from supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC series motor.
 DC Shunt motor.
 Separately excited DC motor.
 DC compound motor.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 570 A.
 440 A.
 340 A.
 250 A.

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor reactance X
 both 1 and 2
 rotor resistance R
None of these

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Peaky in nature.
 Triangular and directed towards brush axis.
 Triangular and directed towards main pole.
 Saddle shape.

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