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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 either GNA or MNA
 GNA
 MNA

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 1 Hz
 5 Hz
 0 Hz
 50 Hz

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Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Armature current Ia.
 Field flux.
 Applied voltage.

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Electrical Machines
Transformer core is laminated to reduce

 hysteresis loss.
 both 1 and 2.
 eddy current loss.
 copper loss.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  series.
  parallel.
  any one of the connection.
  no resistance is connected.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 both armature current Ia and speed ωm increase
 Ia remains constant but ωm increase
 both decrese
 Ia increases and ωm decreses

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