Transmission and Distribution MCQ

Q1. What is the main purpose of power transmission system?

Correct Answer: B

Transmission system carries power from generating stations to substations.

Q2. Which voltage level is used for long distance transmission?

Correct Answer: C

High voltage reduces power loss over long distances.

Q3. What is the main advantage of high voltage transmission?

Correct Answer: B

High voltage reduces I²R losses.

Q4. Which system is used for stepping up voltage?

Correct Answer: A

Step-up transformers increase voltage for transmission.

Q5. What is distribution system in power system?

Correct Answer: B

Distribution system delivers electricity to end users.

Q6. Which is primary distribution voltage level?

Correct Answer: C

Primary distribution commonly uses 11 kV.

Q7. Which is secondary distribution voltage?

Correct Answer: D

Secondary distribution supplies 415V/230V to consumers.

Q8. What is transmission line?

Correct Answer: B

Transmission lines carry electrical power.

Q9. Which material is commonly used for overhead transmission lines?

Correct Answer: B

ACSR is widely used due to strength and conductivity.

Q10. What is corona effect in transmission lines?

Correct Answer: B

Corona is ionization of air around high voltage conductors.

Q11. What is sag in transmission lines?

Correct Answer: B

Sag is the lowest point of conductor between towers.

Q12. Why is sag provided in transmission lines?

Correct Answer: B

Sag reduces mechanical tension due to temperature changes.

Q13. What is insulator in transmission line?

Correct Answer: B

Insulators prevent leakage of current to towers.

Q14. Which material is used for transmission line insulators?

Correct Answer: B

Porcelain and glass are commonly used insulators.

Q15. What is string insulator used for?

Correct Answer: B

String insulators are used in high voltage lines.

Q16. What is the function of a substation?

Correct Answer: B

Substations step up or step down voltage.

Q17. What is busbar in substation?

Correct Answer: B

Busbar distributes power in substations.

Q18. What is circuit breaker used for?

Correct Answer: B

Circuit breakers protect against faults.

Q19. What is isolator in power system?

Correct Answer: B

Isolator is used for no-load switching.

Q20. What is earthing in power system?

Correct Answer: A

Earthing protects against electric shock.

Q21. What is power factor?

Correct Answer: A

Power factor indicates efficiency of power usage.

Q22. What is ideal power factor value?

Correct Answer: C

Unity power factor (1) is ideal.

Q23. What is load factor?

Correct Answer: B

Load factor measures utilization efficiency.

Q24. What is voltage regulation?

Correct Answer: B

Voltage regulation measures voltage variation.

Q25. What is transmission efficiency?

Correct Answer: A

Efficiency is output power divided by input power.

Q26. Which system reduces transmission losses?

Correct Answer: A

High voltage reduces I²R losses.

Q27. What is HVDC transmission?

Correct Answer: A

HVDC uses direct current for long distance transmission.

Q28. What is advantage of HVDC?

Correct Answer: B

HVDC has lower losses for long distance.

Q29. What is corona loss?

Correct Answer: B

Corona causes energy loss in lines.

Q30. What is skin effect?

Correct Answer: B

AC current tends to flow at conductor surface.

Q31. What is proximity effect?

Correct Answer: B

Proximity effect occurs due to nearby conductors.

Q32. What is surge in power system?

Correct Answer: B

Surge is sudden increase in voltage.

Q33. What is lightning arrester used for?

Correct Answer: B

Lightning arrester protects equipment from surges.

Q34. What is distribution transformer?

Correct Answer: B

Distribution transformer reduces voltage for use.

Q35. What is radial distribution system?

Correct Answer: B

Radial system supplies power in one path.

Q36. What is ring main system?

Correct Answer: B

Ring system provides alternate supply path.

Q37. What is feeder in distribution system?

Correct Answer: B

Feeder carries power to distribution points.

Q38. What is service line?

Correct Answer: B

Service line connects consumer to distribution network.

Q39. What is demand factor?

Correct Answer: A

Demand factor measures system demand.

Q40. What is diversity factor?

Correct Answer: A

Diversity factor improves system design.

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