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Electrical Machines

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

  Z.
  P and Z.
  none of these.
  P.

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

 a finite negative value
 a positive finite value
 0
 ∞

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 440 A.
 570 A.
 340 A.
 250 A.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 375 rpm
 75 rpm
 1500 rpm
 3000 rpm

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 1 Hz
 50Hz
 2.5Hz

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 starters
 commutator
 field winding
 armature winding

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