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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

 both A and B
 flux(φ)
None of these
 armature current(Ia)

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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

 0.45 Ω.
  0.24 Ω.
 0.78 Ω.
 0.66 Ω.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.4
 0.2
 0.02

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 800 V.
 100 V.
 400 V.
 200 V.

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 10 Hz.
 50 Hz.
  2 Hz.
  3 Hz.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in opposite direction.
 motor will not run.
 it will run in same direction.
 it will run in same direction by slowly.

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