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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 1.5 %.
  zero.
 4 %.
  less than 1 %.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 1.9 Ω
 2.2 Ω
 5.7 Ω
 6 Ω

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 60 V.
 30 V.
 40 V.

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Electrical Machines
The frame of an induction motor is made of

  stainless steel.
  silicon steel.
  aluminium.
  closed grained cast iron.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  harmonics.
  cogging.
  resonance.
  crawling.

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Electrical Machines
In a DC compound motor the field regulator is provided to

 control the field flux.
 control the armature flux.
 demagnetize the field partially.
 limit the armature current.

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