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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?

 18°
 30°
 60°
 20°

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Increase.
  Remain unaltered.
  Oscillate around the normal speed.
  Reduce.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 1.5Hz
 51.5Hz
 48.5Hz
 2.5Hz

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

All of these
 supply voltage and field current at constant excitation
 power factor and dc excitation at constant load
 power factor and supply voltage during hunting

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Electrical Machines
Tertiary winding in a transformer is mostly

  delta connected.
 star connected.
 zig - zag delta connected.
 zig - zag star connected.

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Electrical Machines
A series motor is efficiently suitable for

 none of these.
  high starting torque operation.
 low starting torque operation.
 constant speed operation.

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