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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f2.
 f1.5.
 f3.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the rotating stator flux and rotor flux.
  magnetizing electric current and back emf.
  the supply voltage and the back emf.
None of these

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Gross power.
 Output power at the shaft.
 Power drawn in KVA.
 Power drawn in KW.

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Electrical Machines
The armature shaft must be able to withstand

 any unbalanced magnetic pull on the armature core.
All of these
 twisting strains due to transmission of torque.
 bending moment due to weight of the armature.

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ra.
 E = V + Ia.
 E = V – IaRa.
  E = V + IaRa.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 open circuit and short circuit tests.
 short circuit and slip tests.
 zero power factor and slip tests.
 open circuit and zero power factor tests.

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