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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Star - delta
 Delta - delta
 Delta - star

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

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

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 570 A.
 440 A.
 340 A.
 250 A.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f²
 V
 f
 V²

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K²
 K²R1
 R1 /K
 K×R1

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.2 lead
 0.2 lag
 0.9 lag

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