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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 both A and B
 armature current (I)
 speed
 flux (φ)

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Normal.
 Very high.
 Zero.
 Very low.

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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.

 armature circuit
 none of above
 shunt field
 both A and B

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
 DC.
None of these
 both of above.

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 both A and B
 roller bearings → large machines
 ball bearings → small machines

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

 stationary
 rotates opposite direction
None of these
 rotates same direction

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MORE MCQ ON Electrical Machines

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