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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Capacitor start
 Resistance split phase
 Capacitor run

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 234.76 N-m.
 133.22 N-m
 266.20 N-m.
 cant be determined.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  cumulatively compounded.
 shunt connected.
  deferentially compounded.
  series connected.

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Electrical Machines
In DC machine torque depends on which of the following?

 speed
 both A and B
 flux (φ)
 armature current (I)

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

  region under main pole.
None of these
 throughout the air gap.
 interpole region.

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Electrical Machines
In a DC Motor 3 point starter is used to

 limit the starting current to a safer value.
 provide protection against Low-Voltage.
 all of above.
 provide overload protection.

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