Q1. Which type of substation is generally preferred in congested urban areas?
A. Outdoor substation
B. Indoor substation
C. Underground substation
D. Pole-mounted substation
Answer: B. Indoor substation
Explanation: Indoor substations require less open space and are safer, making them suitable for congested urban areas.
Q2. Which substation has higher initial installation cost?
A. Outdoor substation
B. Indoor substation
C. Both have same cost
D. Depends only on voltage
Answer: B. Indoor substation
Explanation: Indoor substations require buildings, ventilation, fire protection, and insulation, increasing installation cost.
Q3. Which of the following voltage levels is most suitable for indoor substations?
A. Above 220 kV
B. 132 kV and above
C. Up to 33 kV
D. Above 400 kV
Answer: C. Up to 33 kV
Explanation: Indoor substations are commonly used for low and medium voltages (up to 33 kV). High voltages need large clearances, making indoor installations uneconomical.
Q4. Outdoor substations are generally installed at:
A. Inside buildings
B. Underground
C. Open areas
D. On rooftops
Answer: C. Open areas
Explanation: Outdoor substations require open space for equipment, air insulation, and safety clearances.
Q5. Which type of substation requires less maintenance?
A. Indoor substation
B. Outdoor substation
C. Both same
D. Depends on weather
Answer: A. Indoor substation
Explanation: Indoor substations are protected from weather conditions like rain, dust, and pollution, reducing maintenance.
Q6. Which substation is more affected by environmental conditions?
A. Indoor substation
B. Outdoor substation
C. Underground substation
D. Mobile substation
Answer: B. Outdoor substation
Explanation: Outdoor substations are exposed to rain, sunlight, dust, and pollution, affecting performance and maintenance.
Q7. Safety to operating personnel is higher in:
A. Outdoor substation
B. Indoor substation
C. Both same
D. Pole-mounted substation
Answer: B. Indoor substation
Explanation: Indoor substations provide controlled environments, better enclosure, and protection, enhancing personnel safety.
Q8. Which substation uses air as the main insulating medium?
A. Indoor substation
B. Outdoor substation
C. Gas-insulated substation
D. Underground substation
Answer: B. Outdoor substation
Explanation: Outdoor substations mainly use air insulation, while indoor substations often use oil, SF₆ gas, or solid insulation.
Q9. Expansion or future extension is easier in:
A. Indoor substation
B. Outdoor substation
C. Underground substation
D. GIS substation
Answer: B. Outdoor substation
Explanation: Outdoor substations have more available space, making future expansion easier and economical.
Q10. Which substation is generally preferred for very high voltage transmission?
A. Indoor substation
B. Outdoor substation
C. Pole-mounted substation
D. Distribution substation
Answer: B. Outdoor substation
Explanation: High voltage substations (132 kV and above) require large clearances, which are more feasible outdoors.
Q11. Which substation requires a separate building structure?
A. Outdoor substation
B. Indoor substation
C. Pole-mounted substation
D. Mobile substation
Answer: B. Indoor substation
Explanation: Indoor substations are installed inside buildings to protect equipment and personnel, so a separate structure is required.
Q12. Which substation is more economical for rural areas?
A. Indoor substation
B. Outdoor substation
C. Underground substation
D. Gas insulated substation
Answer: B. Outdoor substation
Explanation: In rural areas, land is easily available and cheaper, making outdoor substations more economical.
Q13. Which substation is less affected by pollution and dust?
A. Outdoor substation
B. Indoor substation
C. Pole-mounted substation
D. Switching substation
Answer: B. Indoor substation
Explanation: Indoor substations are enclosed and protected from dust and pollution.
Q14. In indoor substations, the commonly used insulating medium is:
A. Air only
B. Oil, SF₆ gas, or solid insulation
C. Water
D. Vacuum only
Answer: B. Oil, SF₆ gas, or solid insulation
Explanation: Indoor substations often use oil-filled or gas-insulated equipment due to limited space.
Q15. Outdoor substations generally use which type of insulation?
A. Solid insulation
B. Oil insulation
C. Air insulation
D. Vacuum insulation
Answer: C. Air insulation
Explanation: Outdoor substations mainly depend on air as the insulating medium.
Q16. Which substation is more suitable for extremely high power handling?
A. Indoor substation
B. Outdoor substation
C. Underground substation
D. Distribution substation
Answer: B. Outdoor substation
Explanation: Outdoor substations can handle high power and voltage levels due to ample clearances and space.
Q17. Which type of substation has better accessibility for maintenance equipment?
A. Indoor substation
B. Outdoor substation
C. Both same
D. Underground substation
Answer: B. Outdoor substation
Explanation: Outdoor substations have open layouts, allowing easier movement of cranes and heavy equipment.
Q18. Indoor substations are commonly used in:
A. Desert areas
B. Hilly remote areas
C. Urban and metropolitan areas
D. Agricultural fields
Answer: C. Urban and metropolitan areas
Explanation: Indoor substations are preferred where land is costly and space is limited.
Q19. Which substation has better aesthetic appearance?
A. Outdoor substation
B. Indoor substation
C. Pole-mounted substation
D. Mobile substation
Answer: B. Indoor substation
Explanation: Indoor substations are enclosed and visually less intrusive, making them suitable for cities.
Q20. Which of the following is a disadvantage of indoor substations?
A. High safety
B. Low maintenance
C. High initial cost
D. Less exposure to environment
Answer: C. High initial cost
Explanation: Construction and equipment costs make indoor substations expensive initially.
0 टिप्पणियाँ