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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 50%
 33.3%
 57.7%
 66.3%

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
  Full load.
 No load.
 None of these.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase fault.
 line to line fault.
  line to ground fault.
 3 - phase to ground fault.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 26.21 kW.
 23.06 kW.
 25 kW.
 24.11 kW.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 excitation and load angle
 supply voltage and load angle
 supply voltage and excitation
 supply voltage, load angle and excitation

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Electrical Machines
Stepper motor is used in

 computer printers
 food processing
 traction
All of these

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MORE MCQ ON Electrical Machines

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