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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  carbon.
  stainless steel.
  aluminium.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

  Capacitor run type.
 Shaded pole type.
 Split phase type.
 Capacitor start.

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

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce noise level only.
  prevent hunting and provide the starting torque.
  provide starting torque only.
  reduce the eddy currents.

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  240 rpm.
  470 rpm.
 450 rpm.
 540 rpm.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 magnetostriction.
 zoom.
 boo.
  hum.

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MORE MCQ ON Electrical Machines

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