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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 940 rpm
 1000 rpm
 975 rpm
 950 rpm

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 large and thick
 large and thin
 less and thick
 less and thin

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

  2 Ω.
 10 Ω.
  4 Ω.
 8 Ω.

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Electrical Machines
Tappings of a transformer are provided

 at the phase end of hv side
 at the neutral side end of hv side
 at the phase end of lv side
 at the middle of hv side

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor run.
  Split phase.
  Capacitor start.
  Shaded pole.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 personal computers as cooling fan
 wet grinders
 tape recorders

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