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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 reversing drive
 both 1 and 2
None of these
 non reversing drive

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Reluctance motor.
 Shaded pole motor.
 Hysteresis motor.
  Stepper motor.

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

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

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 0.96
 0.02, 0.98
 0.02, 1.98
 0.04, 1.96

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of commutator segments.
  number of poles.
  number of parallel paths.
  number of pole pairs.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = N1 / N2.
  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = 1.
  E1 / E2 = N1kw1 / N2kw2.

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