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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 decreases.
 remains constant.
 increases.

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum voltage.
 machine will generate maximum power.
 field winding will burn.
 the voltage generated will be zero.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 Remains same.
 Increase.
 None of these.
  Decrease.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  minimum.
  constant.
  variable.
  maximum.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iμ.
 I1 = KI2.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iw.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 440 A.
 44 A.
 400 A.
  40 A.

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