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ELECTRICAL MACHINES

Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 0 V.
 20 V.
 60 V.

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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.
 None of these.
  Decrease.
 Increase.

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Electrical Machines
If a DC motor is connected across the AC supply it will

 Not run.
  Burn.
 Run at lower speed.
 Run at normal speed.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The armature current will reduce.
 The speed of motor will be reduced.
 DC Shunt Motor
  The motor will attain dangerously high speed.

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Electrical Machines
In case of DC shunt motor if load is reduced

  The speed will remains almost constant.
 The speed will increase in proportion to reduction in load.
 The speed will increase abruptly.
 DC Shunt Motor

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