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Electrical Transformers, Power Panels & Phases Quiz

1. What is the main purpose of an electrical transformer?
2. Which transformer increases voltage levels in AC systems?
3. Which transformer provides electrical separation without changing voltage?
4. What principle explains how transformers work?
5. In a transformer, the coil that receives the incoming voltage is called the:
6. What is the main function of an electrical power panel?
7. Which component of a power panel controls power to the entire system?
8. A subpanel is mainly used to:
9. Which type of panel is specifically designed for controlling motors in industrial facilities?
10. In a three-phase AC system, how are the waveforms arranged relative to each other?
11. Which type of power delivery is smoother and more efficient for heavy industrial loads?
12. Which type of power is most commonly used in homes and small offices?
13. A transformer is overheating even under normal load. What is the MOST likely cause?
14. A step-down transformer shows abnormally low output voltage. Which fault is MOST likely?
15. During inspection, a power panel shows repeated breaker trips on one circuit. What is the likely cause?
16. An industrial MCC (Motor Control Center) repeatedly overheats. Which issue is MOST likely?
17. A data center experiences unbalanced loads between phases, causing overheating in the neutral. What type of supply system is this?
Diagram-Based (Label & Match) 18. Label the following transformer parts on the diagram (provide blank diagram):
Answer Key: Primary winding → input coil, connected to supply Secondary winding → output coil, connected to load Magnetic core → laminated iron core linking the flux
19. Match the panel component with its function:
Component Function (letters to match) Main Breaker A) Shuts off all panel power Circuit Breaker B) Protects individual branch circuits Busbars C) Carry electricity across panel Neutral Bar D) Provides return current path Ground Bar E) Provides safety earthing connection Answer Key: Main Breaker–A, Circuit Breaker–B, Busbars–C, Neutral Bar–D, Ground Bar–E
Application & Selection 20. Which transformer would you use to safely connect two circuits without changing voltage?
21. A factory with heavy machinery and HVAC systems requires a stable, efficient power system. Which setup is ideal?
22. A remote cabin requires only lighting and small appliances. Which power supply is best?
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