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Electrical Machines

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

 0 Hz
 1 Hz
 50 Hz
 5 Hz

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Electrical Machines
DC generator will not build up voltage

 due to wrong direction of rotation.
 any one of above.
 if field resistance is more than critical resistance.
  if it has lost residual magnetism.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 I/Ia2
 Ia2
 Ia
 1/Ia

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -1 < S < 1
 -2 < S < 2
 0 < S < 2
 0 < S < 1

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

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 aprroach infinity.
 approach zero.
 between zero and infinity.
 remain unchanged.

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