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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 3 or 4
 1
 2

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Electrical Machines
Dynamic braking is employed to brake

None of these
 both 1 and 2
 non reversing drive
 reversing drive

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

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 11.5 A.
 23 A.
 27 A.
  13.5 A.

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Electrical Machines
Transformer core is laminated to reduce

 both 1 and 2.
 copper loss.
 hysteresis loss.
 eddy current loss.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 run at lower speed.
 run at normal speed.
 not run.

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MORE MCQ ON Electrical Machines

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