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LEVEL 2 MODULE 1 ALTERNATING CURRENTS
2025: EXAM QUESTIONS AND ANSWERS.
1. A device that uses electromagnetic induction to transfer
electrical energy from one circuit to another is a(n) - correct
answer - transformer
2. If a transformer has 200 turns in the primary, 100 turns in the
secondary, and 150VAC applied to the primary, the voltage
across the secondary is - correct answer - 75VAC
3. Transformers in which the primary and secondary voltages are
180 degrees out of phase are known as - correct answer -
unlike-wound transformers
4. Reactive power is always - correct answer - 90° out of phase
with true power
5. If the time for one cycle is 0.1 second, the frequency is - correct
answer - 10Hz
