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Electrical Machines

Electrical Machines
Maximum power developed depends on

 reactance
 load angle
 both 1and 2
 voltage

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = 1.
  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = N1 / N2.
  E1 / E2 = N1kw1 / N2kw2.

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Electrical Machines
DC machine is a

 convection machine.
 conduction machine.
 none of above are correct.
 both are correct.

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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

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

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Fleming's left hand rule.
 Lenz's law.
 Fleming's right hand rule.
 Ampere law.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Mild steel.
 Fibre.
 Cast iron.

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MORE MCQ ON Electrical Machines

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