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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

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

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Electrical Machines
In DC machine torque is proportional to which of the following?

 both A and B
None of these
 armature current(Ia)
 flux(φ)

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

 0.16 pu.
  0.02 pu.
  0.08 pu.
 0.01 pu.

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Electrical Machines
For pure resistive load what is the armature reaction?

 magnetization
 demagnetization
 cross magnetization
All of these

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux weakens the main field flux.
 Armature flux distorts the main field flux.
  Both option B and C.
 None of the options.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

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

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