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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 90o.
 less than 90o.
 0o.
 Greater than 90o.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
  series motor.
 cummulative compound motor.
 AC synchronous motor.

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

 Mild steel.
  Fibre.
 Silicon steel.
 Cast iron.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 1 Hz
 50Hz
 2.5Hz

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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 armature of a DC motor is laminated to reduce

 hysteresis loss.
 copper loss.
 eddy current loss.
 friction and windage loss.

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