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Electrical Machines

Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v2.
 Blv.
 Bl2v.
 Blv2.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 comulatively compounded motor
 permanent magnet motor
 differentially compounded motor
 series motor

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 6 V
 more than 6 V
 zero
 less than 6 V

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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

 100Ω
 200Ω
 10Ω
 50Ω

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Electrical Machines
Tap changer is generally provided in

 earthing transformer.
 current transformer.
 voltage transformer.
  power transformer.

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -2 < S < 2
 0 < S < 1
 0 < S < 2
 -1 < S < 1

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