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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.02
 0.4
 0.04
 0.2

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 460 A.
 340 A.
 250 A.
 570 A.

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Electrical Machines
Open circuit in a transformer is prefered with

 high frequency supply
 rated transformer current
 direct current
 rated transformer voltage

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and armature current
 short circuit current and field current
 no load voltage and field current
 short circuit current and armature current

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 OC and SC tests
 back to back test
 load test
None of these

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

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