2. A transformer operates on: A. Direct current B. Alternating current C. Both AC and DC D. Static electricity Answer: B. Alternating current
3. The core of a transformer is made of: A. Copper B. Aluminum C. Silicon steel D. Plastic Answer: C. Silicon steel
4. What is the main purpose of the core in a transformer? A. To increase resistance B. To provide insulation C. To reduce energy losses D. To provide a path for magnetic flux Answer: D. To provide a path for magnetic flux
5. In an ideal transformer, the input power is equal to: A. The output power B. Twice the output power C. Half the output power D. Zero Answer: A. The output power
Types of Transformers
6. A step-up transformer: A. Decreases voltage and increases current B. Increases voltage and decreases current C. Increases both voltage and current D. Decreases both voltage and current Answer: B. Increases voltage and decreases current7. Which type of transformer is used in transmission lines? A. Isolation transformer B. Step-up transformer C. Step-down transformer D. Auto-transformer Answer: B. Step-up transformer
8. An auto-transformer differs from a regular transformer because it: A. Has multiple windings B. Shares a single winding for input and output C. Only steps up voltage D. Only steps down voltage Answer: B. Shares a single winding for input and output
9. Isolation transformers are used for: A. Increasing efficiency B. Voltage stabilization C. Electrical isolation between circuits D. Current amplification Answer: C. Electrical isolation between circuits
10. Distribution transformers are designed for: A. High voltage and low current B. Low voltage and high current C. High frequency D. Low efficiency Answer: B. Low voltage and high current 11. Which of the following is NOT an application of transformers? A. Power transmission B. Voltage regulation C. Signal amplification D. Electrical isolation Answer: C. Signal amplification
12. Transformers are commonly used in power systems to: A. Stabilize DC voltages B. Transfer electrical energy at different voltage levels C. Rectify AC to DC D. Act as storage devices Answer: B. Transfer electrical energy at different voltage levels
13. Which type of transformer is used in electrical appliances for safety? A. Step-up transformer B. Auto-transformer C. Isolation transformer D. Distribution transformer Answer: C. Isolation transformer
14. In electronic circuits, transformers are used for: A. Impedance matching B. AC voltage transformation C. Signal coupling D. All of the above Answer: D. All of the above
15. The main purpose of a step-down transformer in power supply is to: A. Convert DC to AC B. Reduce high transmission voltages to usable levels C. Increase current D. Generate magnetic flux Answer: B. Reduce high transmission voltages to usable levels