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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 0°
 25° to 30°
 70° to 85°

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Electrical Machines
Armature reaction depends on which of the following?

 both 1 and 2
 power factor of load
None of these
 magnitude of load current

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

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

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Rf maximum and Ra minimum
 Ra minimum and Rf minimum
 Ra maximum and Rf minimum
 Ra maximum and Rf maximum

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to carry extra load.
 to interconnect three voltage systems.
None of these
  to suppress harmonic and unbalance in voltage.

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Electrical Machines
The stator frame in an induction motor is used to

  hold armature stamping in position.
  ventilate the armature.
  provide return path for the flux.
  protect the whole machine.

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