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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / E2
 (E2 - V2) / V2

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Electrical Machines
Ward Leonard control provides speed control

 above rated speed.
 in one direction only.
 below rated speed.
 in both direction.

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Electrical Machines
The brushes of a DC machine should be placed on the

 armature in the polar axis.
 armature midway between poles.
 commutator in the inter polar axis.
 commutator in the polar axis.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2.
 I1 = KI2 + Iμ.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iw.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

  1435.
 1450.
 1500.
 1440.

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Electrical Machines
The frame of an induction motor is made of

  silicon steel.
  aluminium.
  closed grained cast iron.
  stainless steel.

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