Advance Diploma Solar Semester Two Paper 3 Exam Section B

Q1. What is a solar water pumping system?

Answer:
A solar water pumping system uses photovoltaic (PV) panels to generate electricity for operating water pumps. It replaces diesel or grid-powered pumps. It is clean, renewable, and requires low maintenance.

Q2. What are the main components of a solar pumping system?

Answer:
The main components include solar panels, pump controller, motor, and water pump. These work together to convert solar energy into mechanical energy for water lifting.

Q3. What is Total Dynamic Head (TDH)?

Answer:
TDH is the total height water must be lifted, including vertical lift and friction losses. It is a key parameter for selecting the appropriate pump system.

Q4. Differentiate between AC and DC solar pumps.

Answer:
DC pumps run directly on solar DC power, while AC pumps require an inverter. DC pumps are simpler and efficient, whereas AC pumps are suitable for larger systems.

Q5. What is a submersible pump?

Answer:
A submersible pump is installed below the water level. It is used for deep wells and borewells, providing efficient water lifting with minimal losses.

Q6. What is solar cooking?

Answer:
Solar cooking uses solar radiation to generate heat for cooking food. It eliminates the need for conventional fuels like LPG or firewood.

Q7. State two advantages of solar cookers.

Answer:
Solar cookers are environmentally friendly and reduce fuel costs. They also eliminate harmful emissions and are safe to use in rural and urban areas.

Q8. State two disadvantages of solar cookers.

Answer:
Solar cookers cannot be used during cloudy weather or at night. They also take longer time to cook compared to conventional methods.

Q9. Explain the principle of solar cooking.

Answer:
Solar cooking involves collecting solar radiation, converting it into heat, and retaining the heat to cook food. Heat is transferred through the cooking vessel.

Q10. Name different types of solar cookers.

Answer:
Common types include box-type cookers, panel cookers, parabolic dish cookers, and evacuated tube cookers. Each type works based on heat concentration or insulation.

Q11. What is a solar water heater?

Answer:
A solar water heater uses solar thermal energy to heat water. It consists of collectors and storage tanks and is widely used for domestic and industrial purposes.

Q12. What are solar thermal collectors?

Answer:
Solar thermal collectors absorb sunlight and convert it into heat. They are classified as low, medium, or high-temperature collectors based on heat output.

Q13. What is infrared radiation?

Answer:
Infrared radiation is a form of solar energy responsible for heating objects. It is absorbed by water and converted into thermal energy.

Q14. What is the best orientation for solar heaters?

Answer:
The best orientation is south-facing in the Northern Hemisphere. It ensures maximum exposure to sunlight throughout the day.

Q15. What is net metering?

Answer:
Net metering is a system that allows users to export excess solar electricity to the grid and receive credits. It uses a bidirectional meter.

Q16. How does net metering reduce electricity bills?

Answer:
Excess energy generated is sent to the grid and credited. Consumers only pay for net energy consumption after adjustment.

Q17. What is a bidirectional meter?

Answer:
A bidirectional meter records both electricity import from the grid and export to the grid. It is essential for net metering systems.

Q18. What is virtual net metering?

Answer:
Virtual net metering allows energy generated at one location to be shared across multiple consumers. It benefits people without rooftop access.

Q19. Why is virtual net metering important?

Answer:
It enables participation in solar energy for users who lack suitable installation space. It improves utilization of solar power across multiple users.

Q20. What is a techno-commercial proposal?

Answer:
It is a document combining technical design and financial analysis of a solar project. It helps in decision-making and project approval.

Q21. What are the key elements of a techno-commercial proposal?

Answer:
Key elements include technical design, financial viability, risk assessment, and client requirements. These ensure project feasibility.

Q22. What is payback period?

Answer:
Payback period is the time required to recover the investment cost of a solar system through savings or revenue generation.

Q23. What is solar project management?

Answer:
It involves planning, executing, and controlling solar projects to ensure timely delivery, cost efficiency, and high performance.

Q24. What are the phases of a solar project lifecycle?

Answer:
Phases include pre-feasibility, design, procurement, construction, commissioning, and operation & maintenance.

Q25. What is site assessment?

Answer:
Site assessment involves evaluating location factors like shading, load profile, weather data, and structural capacity before installation.

Q26. What is load profile analysis?

Answer:
Load profile analysis studies energy consumption patterns over time. It helps in sizing solar systems accurately.

Q27. What is peak demand?

Answer:
Peak demand is the maximum power consumption at a given time. It is used for system design and inverter sizing.

Q28. What is procurement in solar projects?

Answer:
Procurement involves purchasing solar components like panels, inverters, and cables from suppliers.

Q29. What are Balance of System (BOS) components?

Answer:
BOS includes all components except PV modules, such as inverters, cables, mounting structures, and protection devices.

Q30. What is a combiner box?

Answer:
A combiner box combines outputs from multiple solar panel strings into a single DC output for the inverter.

Q31. What is grounding in solar systems?

Answer:
Grounding ensures safety by directing fault currents into the earth. It protects equipment and users from electrical hazards.

Q32. What is a solar cable?

Answer:
A solar cable is an insulated conductor used to connect components in a PV system. It is designed to withstand harsh weather conditions.

Q33. What is wire gauge?

Answer:
Wire gauge indicates the thickness of a cable. Lower gauge means thicker wire with higher current carrying capacity.

Q34. Why is voltage drop important in cables?

Answer:
Voltage drop reduces system efficiency. Proper cable sizing minimizes energy losses in solar systems.

Q35. What is an installation checklist?

Answer:
It is a structured list ensuring all installation steps are completed safely and correctly. It improves system performance.

Q36. Why is pre-installation preparation important?

Answer:
It ensures safety, compliance, and system efficiency. It helps avoid installation errors and long-term issues.

Q37. What tools are required for solar installation?

Answer:
Tools include drills, PV testers, cable tools, and safety equipment like fall protection gear.

Q38. What is a solar array?

Answer:
A solar array is a group of solar panels connected together to generate electricity. It forms the core of a PV system.

Q39. What is series connection in solar panels?

Answer:
In series connection, panel voltages add up while current remains the same. It increases system voltage.

Q40. What is parallel connection in solar panels?

Answer:
In parallel connection, currents add up while voltage remains the same. It increases total current output.

Q41. What factors affect solar array size?

Answer:
Factors include energy demand, panel wattage, sunlight availability, and system voltage requirements.

Q42. What is PV system sizing?

Answer:
It is the process of determining the size of solar panels, battery, and inverter based on energy requirements.

Q43. What are the benefits of solar projects?

Answer:
Solar projects reduce carbon emissions, lower electricity costs, and provide sustainable energy solutions.

Q44. How do solar systems reduce carbon footprint?

Answer:
They replace fossil fuel-based electricity with renewable solar energy, reducing greenhouse gas emissions.

Q45. What is grid-connected solar system?

Answer:
It is a system connected to the utility grid, allowing energy import and export without battery storage.

Q46. What is inverter efficiency?

Answer:
Inverter efficiency is the ratio of AC output to DC input. Higher efficiency means less energy loss.

Q47. What is earthing in solar systems?

Answer:
Earthing protects systems from electrical faults and lightning by providing a safe path for excess current.

Q48. What is the function of an inverter?

Answer:
An inverter converts DC electricity from solar panels into AC electricity for use in homes and industries.

Q49. What is energy monitoring system?

Answer:
It tracks solar energy production and consumption. It helps in performance analysis and maintenance.

Q50. Why is solar energy considered renewable?

Answer:
Solar energy is continuously available from the sun and does not deplete over time. It is clean and sustainable.