Transformer — Prelims Questions

An ideal transformer has 400 turns in the primary coil and 2000 turns in the secondary coil. If the primary voltage is 200 V AC, what is the secondary voltage?

A step-down transformer converts 220 V AC to 11 V AC. If the primary current is 0.5 A and the transformer is ideal, what is the secondary current?

Which of the following is NOT a reason for energy loss in a real transformer?

A transformer is used to step down a 220 V AC supply to 11 V AC. If the primary coil has 2000 turns, how many turns should the secondary coil have?

An ideal transformer has an efficiency of 90%. It is used to step down 200 V AC to 20 V AC. If the input power is 100 W, what is the output power?

Why is a soft iron core preferred over steel or air core in a transformer?