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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 5
 12
 10
 24

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Eddy current losses
 Both 1 and 2
 Copper losses
 Hysteresis losses

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Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 (Pi/Pc)2
 Pi/Pc
 Pc/Pi
 √(Pi/Pc)

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

 electromechanical energy conversion.
 development of torque.
 generation of voltage.
 commutation.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Reversing armature connection or field connection.
 Interchanging armature and field connection.
 Adding resistance to field circuit.
 Reversing supply connection.

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Electrical Machines
The functions of inter poles are

None of these
 reduce cross magnetization effect and improve commutation
 nullify reactance voltage and improve the commutation.
 both 1 and 2

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