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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  simple in construction.
  less cost.
  all of below.
  less maintenance.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 350 V.
 400 V.
 480 V.

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
 dynamically induced emf.
 dynamically and statically induced emf.
None of these

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 50, 1500.
 60, 1440.
  60, 1500.
 1440, 1500.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Parallel.
 None of the options.
 Compound.
  Series.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 shunt field
 none of above
 both A and B
 armature circuit

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