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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Delta - star
 Star - delta
 Star - star

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  Fail to start.
  Either short circuit or open circuit occurs.
  It will rotates in reverse direction.
  It will rotates in normal operation.

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Series shunt.
 have an equal number of electrons and protons.
  Differentical compound.
 Cummulative compound.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt= Ea– Iara
 Vt = Ea + Ia(ra + rs)
 Vt= Ea + Iara
 Vt = Ea + Iara+ ILrs

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The speed of motor will be reduced.
 The armature current will reduce.
  The motor will attain dangerously high speed.
 DC Shunt Motor

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

  Full load.
 Low load.
 No load.
 None of these.

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