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Question-1. What is a transformer?
Answer-1: A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.
Question-2. What are the primary components of a single-phase transformer?
Answer-2: The primary components of a single-phase transformer are the primary and secondary windings, and a magnetic core.
Question-3. What is the principle of transformer?
Answer-3: Transformers operate based on the principles of electromagnetic induction, where alternating current in the primary winding induces a changing magnetic field, which in turn induces a voltage in the secondary winding.
Question-4. What is the purpose of the primary winding in a single-phase transformer?
Answer-4: The primary winding in a single-phase transformer is connected to the input voltage source and is responsible for receiving the electrical energy.
Question-5. What is the purpose of the secondary winding in a single-phase transformer?
Answer-5: The secondary winding in a single-phase transformer is connected to the load and is responsible for delivering the electrical energy.
Question-6. What is the purpose of the magnetic core in a transformer?
Answer-6: The magnetic core provides a low reluctance path for the magnetic flux generated by the primary winding, enhancing the efficiency of energy transfer.
Question-7. What is the turns ratio of a transformer?
Answer-7: The turns ratio of a transformer is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding.
Question-8. How is the voltage ratio related to the turns ratio in a transformer?
Answer-8: The voltage ratio of a transformer is directly proportional to its turns ratio. For example, if the turns ratio is 1:2, the voltage ratio will be 1:2 as well.
Question-9. What are the different types of single-phase transformer connections?
Answer-9: The different types of single-phase transformer connections include the step-up, step-down, and isolation configurations.
Question-10. What is the step-up configuration in a single-phase transformer?
Answer-10: The step-up configuration in a single-phase transformer increases the voltage from the primary winding to the secondary winding.
Question-11. What is the step-down configuration in a single-phase transformer?
Answer-11: The step-down configuration in a single-phase transformer decreases the voltage from the primary winding to the secondary winding.
Question-12. What is the isolation configuration in a single-phase transformer?
Answer-12: The isolation configuration in a single-phase transformer provides electrical isolation between the primary and secondary windings, ensuring safety and preventing ground loops.
Question-13. How will you define the efficiency of a transformer?
Answer-13: Efficiency of a transformer can be defined as the output power divided by the input power. That is efficiency = output / input .
Question-14. What factors affect the efficiency of a single-phase transformer?
Answer-14: The factors that affect the efficiency of a single-phase transformer include core losses, winding resistance, and load impedance.
Question-15. What is the voltage regulation of a single-phase transformer?
Answer-15: The voltage regulation of a single-phase transformer is the percentage change in output voltage from no-load to full-load conditions.
Question-16. What are the standard voltage ratings for transformers?
Answer-16: Standard voltage ratings for transformers include 120V, 240V, 480V on the primary side, and various voltages on the secondary side depending on application.
Question-17. How are transformers cooled?
Answer-17: Transformers are cooled using methods such as natural convection, forced air cooling, or liquid cooling (using oil or other dielectric fluids).
Question-18. What are the common applications of single-phase transformers?
Answer-18: Common applications include voltage conversion for residential and commercial use, power distribution, and isolation.
Question-19. Can transformers be connected in series or parallel?
Answer-19: Transformers can be connected in parallel to increase capacity or redundancy, but connecting them in series is not common due to impedance matching issues.
Question-20. What are autotransformers?
Answer-20: Autotransformers are transformers where the primary and secondary windings are connected electrically, allowing for voltage conversion with fewer windings, resulting in smaller size and weight compared to conventional transformers.
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