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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 180o.
 dependent upon the load.
 90o.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 60
 660
 40
 600

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 generation of voltage
 commutation
 electromechanical energy conversion
 development of torque

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Electrical Machines
The armature shaft must be able to with stand

 Bending moment due to weight of the armature.
 Twisting stains due to transmission of torque.
All of these
 Any unbalanced magnetic pull on the armature core.

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Electrical Machines
Which of the following motor has more stability

 cylindrical motor
 salient pole motor
 both motors has same stability
None of these

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Electrical Machines
Which of the following is/are not a self starting motor?

 3-phase induction motor
None of these
 1-phase induction motor
 both 1 and 2

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