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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  cast iron.
  mild steel.
  aluminium.
  stainless steel.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

  45°C.
 35°C.
 27°C.
 32°C.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 50 V.
 100 V.
  230.2 V.
 399 V.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 6 V
 220 V
 somewhat less than 220 V
 more than 220 V

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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.

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

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 percentage impedance.
 leakage reactance.
 rating.
 efficiency.

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