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Electrical Machines

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

 27°C.
 35°C.
  45°C.
 32°C.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 40, s = 5.79 %.
  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and high voltage
 low current and high voltage
 high current and low voltage
 low current and low voltage

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Series motor.
 Differential compound motor.
 Shunt motor.
 Cummulative compound motor.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 as it carries large load current.
 in order to reduce eddy current to provide large flux.
 to reduce the insulation of materials.
 to provide large flux.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage
 remain nearly constant
 decrease

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