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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 1 Hz
 5 Hz
 0 Hz
 50 Hz

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 series generators
 over compound generator
 shunt generator
 both B and C

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 slip speed.
 synchronous speed.
 normal speed.
 any of the above.

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Electrical Machines
The armature shaft must be able to with stand

 Bending moment due to weight of the armature.
All of these
 Twisting stains due to transmission of torque.
 Any unbalanced magnetic pull on the armature core.

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 100 V.
 399 V.
 50 V.

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
 half of the supply voltage.
 double the supply voltage.
All of these

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