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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 finite value
 1
 infinite value
 0

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start capacitor run motor
All of these
 Resistance split phase motor
 Capacitor start motor

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  external star-connected resistors.
  equalizing coils.
  3 - Φ AC supply.
  DC supply.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature voltage control.
 Armature circuit resistance control.
 Field resistance control.
 Any of above.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  unequal to number of rotor slots and skewed in shape.
  either (B) or (C).
  an integral multiple of number of rotor slots.
  equal to number of rotor slots.

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