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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 conduction.
  convection.
 radiation.
All of these

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 96%
 95%
 94%
 92%

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Electrical Machines
Voltage regulation can be determined by which of the following?

 ZPF method.
 MMf method.
All of these
 Synchronous impedance method.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 both A and B
 shunt field
 none of above
 armature circuit

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 torque but not the voltage
 both the torque and voltage
 voltage but not the torque
 neither the voltage nor the torque

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Electrical Machines
Dynamic braking can be used for

 compound motors.
 shunt motors.
 series motors.
All of these

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