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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 Infinitely large.
 1000 ohms.
 around 500 ohms.
  Low.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  crawling.
  cogging.
  skewing.
  slip.

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide protection against Low-Voltage.
 provide overload protection.
 limit the starting current to a safer value.
 all of above.

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

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

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the hysteresis loss.
  increases the electrical resistivity of iron.
None of these
  reduces the saturation magnetization.

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 increase by 5 %.
 reduce by 5 %.
 depend on other factors.
 remain unchanged.

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MORE MCQ ON Electrical Machines

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