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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imax.
 Vmin to Imax.
 Vmin to Imin.
 Vmax to Imin.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature connections.
 series field connections.
 armature or field connections.
 shunt field connections.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  air gap does not matter.
  as small as possible.
  depends on the material of stator and the rotor.
  as wide as possible.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 None of these.
 Full load speed.
  Full load current.
 Full load torque.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 rotor resistance
 supply frequency
 supply voltage
None of these

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Ampere's law.
 Lenz's law.
 Fleming's right hand rule.
  Fleming's left hand rule.

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