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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 0 Hz
 100 Hz
 50 Hz
 25 Hz

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 6% and -4%
 4.8% and -3.2%
None of these
 3.2% and -1.6%

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Iara+ ILrs
 Vt= Ea– Iara
 Vt= Ea + Iara
 Vt = Ea + Ia(ra + rs)

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  equal to number of rotor slots.
  unequal to number of rotor slots and skewed in shape.
  an integral multiple of number of rotor slots.
  either (B) or (C).

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

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

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Electrical Machines
If the field winding connection of DC shunt motor is changed

  It will run in opposite direction.
 motor will become slow.
 It will run in same direction.
 motor will not run.

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