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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 50
 1
 100

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  cumulatively compounded.
  deferentially compounded.
 shunt connected.
  series connected.

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Electrical Machines
Counter emf of a DC motor

 regulates its armature voltage.
 aids applied voltage.
 exceeds supply voltage
 helps in energy conversion.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  magnetic inertia.
  high speed.
  high field resistance.
  residual flux.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 1130 r.p.m.
 4575.4 r.p.m.
 963.8 r.p.m.
 1037.5 r.p.m.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 load current
 both 2 and 3
 maximum flux density
 supply frequency

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