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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
  2.5 %.
  15 %.
 10 %.

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KW.
 Gross power.
 Power drawn in KVA.
  Output power at the shaft.

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to interconnect three voltage systems.
None of these
 to carry extra load.
  to suppress harmonic and unbalance in voltage.

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Electrical Machines
Conservator tank is used

 to act as an oil storage.
 for better cooling of transformer.
None of these
 to take up the expansion of oil due to temperature rise.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 133.22 N-m
 266.20 N-m.
 can not be determined.
 234.76 N-m.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/3000.
 PN/2.
 PN/120.
 PN/60.

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