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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 (1/2)Fmax.
  (3/2)Fmax.
 Fmax.
 3Fmax.

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 per unit impedance
 ratings
 efficiency
 leakage reactance

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 B - C - A or C - A - B.
  A - C - B.
 C - A - B.
 B - C - A.

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Electrical Machines
Commutators in DC machines have a role of which converts

 none of these.
 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.
 AC to DC.

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary open circuited.
 auto transformer.
 two winding transformer with secondary short circuited.
None of these

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  500 rpm.
  3600 rpm.
  600 rpm.
  3000 rpm.

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