Transformer Multiple Choice Questions and Answers PDF

MCQ 1: In a transformer, the primary coil is connected to:

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

MCQ 2: 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

MCQ 3: In transformer the changing current in primary coil induces changing magnetic field in:

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

MCQ 4: 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

MCQ 5: 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