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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  simple in construction.
  less cost.
  all of below.
  less maintenance.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

  1435.
 1450.
 1500.
 1440.

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 full load
 half load
 any of the above
 no load

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  Both (A) and (B).
  By varying the supply frequency.
  By varying number of poles.
  By varying supply voltage.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  hysteresis losses.
  mechanical losses.
  ohmic losses.

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  crawling.
  cogging.
  relative speed.
  air gap.

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