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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 power.
 current.
 speed.
 torque.

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Electrical Machines
Demagnetization effects which of the following?

 both B and C
 reduction in main field flux
 reduces the terminal voltage
 commutation

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 115 V
 230 V
 200 V
 460 V

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Electrical Machines
The brushes of a DC machine should be placed on the

 armature midway between poles.
 commutator in the polar axis.
 commutator in the inter polar axis.
 armature in the polar axis.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave
 half wave
 half wave controlled
 full wave controlled

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 1.5Hz
 51.5Hz
 2.5Hz
 48.5Hz

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