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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 0°
 70° to 85°
 25° to 30°
 90°

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Electrical Machines
The functions of inter poles are

 reduce cross magnetization effect and improve commutation
None of these
 nullify reactance voltage and improve the commutation.
 both 1 and 2

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 linearised
 parabola
 hyperbola
 any of the above

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  500 to 720.
  720 to 920.
  375 to 500.
  1440 to 2880.

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

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

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 200 rpm.
 541.67V, 250 rpm.
 2166.67V, 230 rpm.
 2166.67V, 270 rpm.

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