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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 0
 infinite value
 1
 finite value

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 zero watt
 more than 30 W
 less than 30 W
 30 W

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Newtons law.
 Amperes law.
 Coulombs law.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 zero
 maximum
All of these
 minimum

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 50
 10
 1

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 None of above.
 Remain unchanged
 Increases.
 Decreases.

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