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Questions and Answers
What is the current at the secondary side of a transformer with 400 primary turns and 100 secondary turns, if a 20 A current is flowing through the primary?
Why is a transformer considered an efficient machine?
In a 120-V dc shunt motor rated at 6 hp with armature and shunt field resistances of 0.1 Ω and 100 Ω, if the motor draws a rated armature current of 50 A, what is the efficiency of the motor?
In a 480/240 V transformer with the secondary open circuited, what is the core loss component current when the primary current is 0.15 A at a power factor of 0.6?
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If a transformer has 240 turns on the primary and 30 turns on the secondary, and the primary draws 0.3 A from the supply lines, what is the current in the secondary side?
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In a transformer with a load current of 4 A at 0.25 power factor, which resistance value represents the reactive component?
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