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Electrical Machines

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

 60°
 20°
 30°
 18°

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid locking of the armature.
 to achieve a stronger magnetic field.
All of these
 to avoid over heating.

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increases the design cost
 increase the iron loss
All of these
 increase the maintenance and repair

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 start haunting.
 run at very low speed.
 run at very high speed.
 burn.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 None of above.
 decrease.
 not change.
 increase.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1450.
 1500.
  1435.
 1440.

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