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Electrical Machines

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

 3000 rpm
 1500 rpm
 750 rpm
 1000 rpm

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  separately excited.
  cumulatively compounded.
 differentially compounded.
  shunt connected.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 ∞
 0
 a positive finite value
 a finite negative value

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1470 rpm
 30 rpm
 1500 rpm
 zero

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

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

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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

 0 V.
 60 V.
 20 V.
  40 V.

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