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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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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

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

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC Shunt motor.
 DC compound motor.
 DC series motor.
 Synchronous motor.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 large and thick
 less and thick
 less and thin
 large and thin

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Electrical Machines
Example of double excited machine is

 DC Shunt Motor
 Synchronous motor.
 Both are correct.
None of these

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 armature current will drop
 motor will attain dangerously high speed
 armature will oscillate about original speed as the mean speed
 motor will become slow.

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