Transformer MCQ (Multiple Choice Questions) PDF Download

In a transformer, the primary coil is connected to

1. Alternating current (AC) source
2. Direct current (DC) source
3. resistor
4. inductor

A transformer is designed to convert the voltage from 240 V a.c mains to 12 V, and has 4000 turns on its primary coil. The turns on its secondary coil should be

1. 100
2. 200
3. 120
4. 480

In transformer the changing current in primary coil induces changing magnetic field in

1. resistor
2. inductor
3. insulator
4. secondary coil

A transformer is designed to convert the voltage from 240 V a.c mains to 12 V, and has 4000 turns on its primary coil. If it is 100% efficient, and the current in the secondary coil was 0.4 A then the current in the primary coil should be

1. 0.08 A
2. 0.05 A
3. 0.02 A
4. 0.01 A

If the secondary voltage is larger than the primary voltage, the transformer is called a

1. positive transformer
2. step-up transformer
3. negative transformer
4. step-down transformer