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Electrical Machines

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

  45°C.
 27°C.
 35°C.
 32°C.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 65 V
 230 V
 115 V

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 0.08
 -1.92
 1.92
 -0.08

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Rf maximum and Ra minimum
 Ra maximum and Rf minimum
 Ra minimum and Rf minimum
 Ra maximum and Rf maximum

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

  series motor.
 cummulative compound motor.
 shunt motor.
 AC synchronous motor.

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Electrical Machines
DC shunt motors are suitable for

  All of this.
 Lathes.
 Centrifugal pumps
 Blowers and fans.

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