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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
 2 to 3.
 3 to 5.
  1.5 to 2.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor start.
  Capacitor run.
  Split phase.
  Shaded pole.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 23 A.
 27 A.
 11.5 A.
  13.5 A.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 30 V.
 40 V.
 60 V.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 running torque.
 efficiency.
 starting torque.
 speed regulation.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  25 Hz.
  60 Hz.
  50 Hz.

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