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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 180.
 30.
 45.
  270.

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

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

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Electrical Machines
At stand still condition the value of slip is

 1
 infinite value
 finite value
 0

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Electrical Machines
Short circuiting is caused in the armature winding due to

  grounding of two or more turns of the same coil.
  any of above.
 failure of insulation between two commutator bars.
  failure of insulation between two turns of coil.

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 2000 Volt.
 1600 Volt.
 1500 Volt.
  0 Volt.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V
 V²
 f
 f²

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