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Electrical Machines

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

 not run.
 burn.
 run at normal speed.
 run at lower speed.

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Electrical Machines
The back emf produced in a dc motor depends on

  Z.
  none of these.
  P.
  P and Z.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  get over heated.
  run normally.
  not run.
  make noise.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

  1435.
 1500.
 1440.
 1450.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The voltage across the terminals.
 The speed of motor.
 The torque required.
 None of above.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 474 V
 6 V
 240 V
 234 V

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