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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  aluminium.
  stainless steel.
  phosphor bronze.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 100W
 1000W
 3000W
 500W

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 10Ω
 100Ω
 200Ω
 50Ω

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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?

 30 V.
 90 V.
 60 V.
 40 V.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 eddy-current loss
 temperature rise
 mechanical loss
 hysteresis loss

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
All of these
 double the supply voltage.
 half of the supply voltage.

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MORE MCQ ON Electrical Machines

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