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Electrical Machines

Electrical Machines
In single phase rotary converter the number of slip rings will be

 two.
 four.
 three.
 six.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 generator field terminal.
 motor armature terminal.
 generator armature terminal.
 motor field terminal.

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 shifting the brush axis from GNA to MNA.
 fixing the brush axis inline with the pole axis.
  compensating winding and commutating poles.
 increasing field excitation.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Power drawn in KVA.
 Output power at the shaft.
 Gross power.
 Power drawn in KW.

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 30°
 20°
 60°
 18°

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 30°
 18°
 72°

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MORE MCQ ON Electrical Machines

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