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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 1000 rpm
 975 rpm
 940 rpm
 950 rpm

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Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Field.
 Armature.
 Coupling mounted on the shaft.

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Electrical Machines
A series motor is efficiently suitable for

  high starting torque operation.
 low starting torque operation.
 constant speed operation.
 none of these.

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
 50 ohm.
 100 ohm.
  0.5 ohm.

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 57.7%
 33.3%
 66.3%
 50%

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 4 time the initial value
 1/4 of the intial value
 twice the initial value
 1/2 of the initial value

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