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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 zero
 maximum
All of these
 minimum

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Electrical Machines
Regenerative braking is not found in which motor?

 Induction motor.
 DC shunt.
  DC series.
 DC compound.

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor start
 Capacitor run
 Shaded pole
 Resistance split phase

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

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

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 40 V.
 20 V.
 60 V.
 0 V.

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum voltage.
 field winding will burn.
 the voltage generated will be zero.
 machine will generate maximum power.

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MORE MCQ ON Electrical Machines

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