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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 Induction motor.
 DC compound.
  DC series.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 250 W
 500 W
 300 W
 400W

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole and compensating windings together
 field winding
 interpole winding
 armature winding

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 4 KVA
 6 KVA
 0 KVA
 10 KVA

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = ωm
 ωe = 1/2*ωm
 ωe = 4*ωm
 ωe = 2*ωm

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Both 1 and 2
 Copper losses
 Eddy current losses

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