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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Fibre.
 Silicon steel.
 Mild steel.
 Cast iron.

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

None of these
 rotor resistance
 supply frequency
 supply voltage

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Electrical Machines
Which of the following motor is used in grinders?

  Capacitor start IM.
  Synchronous motor.
  Split phase IM.
  Capacitor start capacitor run IM.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Reversing armature connection or field connection.
 Adding resistance to field circuit.
 Interchanging armature and field connection.
 Reversing supply connection.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 14.28%.
 18.25%.
 15.30%.
 16.67%.

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Amperes law.
 Newtons law.
 Coulombs law.

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MORE MCQ ON Electrical Machines

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