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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 no load
 half load
 any of the above
 full load

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with field weaking control.
 DC compound motor.
 DC shunt motor with armature resistance.
 DC series motor.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 KefKf2Bm2.
 Kef2Kf2Bm.
  Kef2Kf2Bm2.
 Kef2KfBm2.

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Electrical Machines
Generators work on the principle of production of

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

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Electrical Machines
Which of the following alternators contain large number of poles?

 Turbo alternators.
 Aame in both alternators.
 Hydro alternators.
None of these

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 remains same.
 Decrease.d
 increase.
 none of these.

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