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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 series motors
 cumulative compound motors
 shunt motors
 both B and C

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Electrical Machines
In electric locomotive which of the following motor are used ?

  Shunt motor.
  Synchronous motor.
  DC series motor.
  Separately compound motor.

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

 any of the above
 full load
 no load
 half load

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.125 p.u
  0.25 p.u
  0.75 p.u
  0.5 p.u

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/3
 1/√3, 1/√3
 1/3, 1/√3
 1/√3, 1/3

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 1
 2 and 2
 4 and 2
 4 ang 1

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