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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 230 V.
 460 V.
 200 V.

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

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

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

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

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 3
 1/3
 1/√3
 √3

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

  In series with the armature winding.
 As a separate unit.
 In parallel with the armature winding.
 In parallel with the field winding.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  hysteresis losses.
  eddy current losses.
  mechanical losses.
  ohmic losses.

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MORE MCQ ON Electrical Machines

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