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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 copper loss
 hysteresis loss
 eddy current loss
 both 1and 2

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Electrical Machines
Lamination of transformer core is made of

 cast steel.
  silicon steel.
 wrought iron.
  cast iron.

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4Sa²
 PZL/4S
 PZL/4SP²
 PZL/ 4Sa

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 1, 2, 3
 2, 3, 4
 2, 3 ,5
 2, 3, 4, 5

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Electrical Machines
DC machine is a

 conduction machine.
 convection machine.
 none of above are correct.
 both are correct.

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Electrical Machines
The armature shaft must be able to withstand

 bending moment due to weight of the armature.
All of these
 any unbalanced magnetic pull on the armature core.
 twisting strains due to transmission of torque.

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MORE MCQ ON Electrical Machines

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