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Electrical Machines

Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

  hum.
 boo.
 zoom.
 magnetostriction.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting current will be enormously high.
 the motor may run away.
 the motor may not start.
 the starting torque becomes low.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 iron loss.
 reluctance of core.
 volume of copper.
 volume of iron.

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 none of above.
 Ward Leonard control.
 rheostatic control.
 any of above method.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 slip speed.
 normal speed.
 any of the above.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1000 rpm
 3000 rpm
 750 rpm
 1500 rpm

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