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Electrical Machines

Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
  0.08 pu.
 0.01 pu.
 0.16 pu.

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 maximum
 infinite value
 zero
 any of the above

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Electrical Machines
The three point starter is used for

  Shunt, compound and series motor.
  Shunt motor as well as compound motors.
  Series motor.
  Shunt motor.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Hysteresis losses
 All of the them
 Eddy current losses
 Friction and windage losses

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 draw too much current.
 open fuse or circuit breaker.
 produce sparking at brushes.
 develop excessive speed and damage itself.

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.25.
 0.72.
 1.24.
 0.62.

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