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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 series motors
 both B and C
 cumulative compound motors
 shunt motors

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.78 Ω.
 0.45 Ω.
  0.24 Ω.
 0.66 Ω.

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 940 RPM
 960 RPM
 970 RPM
 920 RPM

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  overload.
  uneven air gap.
  poor lubrication.
  overheating of winding.

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
 half of the supply voltage.
 double the supply voltage.
All of these

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Electrical Machines
Which type motors are preferred for lathes?

 Synchronous motor.
 DC shunt motors.
 Squirrel Cage induction motor.
 Either A or B.

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MORE MCQ ON Electrical Machines

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