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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

  convection.
 radiation.
All of these
 conduction.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 cosδ
 sin2δ
 cos2δ

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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

 5.7 Ω
 2.2 Ω
 6 Ω
 1.9 Ω

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

  3.33 %.
 0 .001 %.
None of these
 3 %.

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Electrical Machines
The commutator segments of DC machines are made up of

 brass
 hard-drawn copper
 copper
 copper alloy

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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

 Blv2.
 Blv.
 Bl2v2.
 Bl2v.

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