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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 1 - s.
  2 - s.
  s.
 2 + s.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 133.22 N-m
 can not be determined.
 234.76 N-m.
 266.20 N-m.

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Electrical Machines
Generators work on the principle of production of

 dynamically induced emf.
None of these
 dynamically and statically induced emf.
 statically induced emf.

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Electrical Machines
Tertiary winding in a transformer is mostly

 zig - zag delta connected.
  delta connected.
 zig - zag star connected.
 star connected.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 50 KVA
 100 KVA
 123.3 KVA
 83.33 KVA

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the series field
 in parallel with the shunt field
 in series with the series field
 in series with the shunt field

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