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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 50 ohm.
 100 ohm.
  0.1 ohm.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 50 KVA
 100 KVA
 83.33 KVA
 123.3 KVA

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

 0
 2
 1
 3 or 4

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 increase by 5 %.
 remain unchanged.
 depend on other factors.
 reduce by 5 %.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = ωm
 ωe = 4*ωm
 ωe = 1/2*ωm
 ωe = 2*ωm

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Cross magnetization
 Magnetization
None of these
 Demagnetization

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