Renewable Plant O&M interview questions

1. A.monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module
2. B.leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
3. C.actual energy divided by the energy the plant would give at STC efficiency for the measured irradiation; healthy Indian plants run at about 75–82%
4. D.gearbox, pitch and yaw systems dominate downtime; OEM service contracts guarantee 95–97% time-based availability with condition monitoring of drivetrain vibration

Answer + AI explanation with Pro

1. A.Soiling loss
2. B.String current monitoring
3. C.Performance ratio
4. D.RE forecasting and scheduling

Answer + AI explanation with Pro

1. A.Performance ratio — leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
2. B.Performance ratio — deviation beyond the error band, about ±15% of available capacity under most state forecasting and scheduling regulations, attracts slab-wise charges that forecasting accuracy directly reduces
3. C.Performance ratio — monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module
4. D.Performance ratio — actual energy divided by the energy the plant would give at STC efficiency for the measured irradiation; healthy Indian plants run at about 75–82%

Answer + AI explanation with Pro

1. A.dust deposition costs 3–5% or more per month at dry Indian sites without cleaning, so cleaning cycles or dry robotic cleaners are scheduled against water cost
2. B.annual energy over rated capacity times 8760 hours; roughly 17–21% for fixed-tilt solar in India and 25–35% for wind
3. C.wind and solar generators submit day-ahead 15-minute schedules through a Qualified Coordinating Agency and may revise them intra-day, typically up to 16 times
4. D.deviation beyond the error band, about ±15% of available capacity under most state forecasting and scheduling regulations, attracts slab-wise charges that forecasting accuracy directly reduces

Answer + AI explanation with Pro

1. A.DSM for renewables
2. B.Capacity utilisation factor
3. C.Potential-induced degradation
4. D.Wind turbine O&M

Answer + AI explanation with Pro

1. A.Capacity utilisation factor — monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module
2. B.Capacity utilisation factor — Riso alarm when array-to-earth resistance falls below the set threshold at dawn, usually from wet connectors, damaged DC cable or moisture in a module junction box
3. C.Capacity utilisation factor — annual energy over rated capacity times 8760 hours; roughly 17–21% for fixed-tilt solar in India and 25–35% for wind
4. D.Capacity utilisation factor — deviation beyond the error band, about ±15% of available capacity under most state forecasting and scheduling regulations, attracts slab-wise charges that forecasting accuracy directly reduces

Answer + AI explanation with Pro

1. A.actual energy divided by the energy the plant would give at STC efficiency for the measured irradiation; healthy Indian plants run at about 75–82%
2. B.annual energy over rated capacity times 8760 hours; roughly 17–21% for fixed-tilt solar in India and 25–35% for wind
3. C.wind and solar generators submit day-ahead 15-minute schedules through a Qualified Coordinating Agency and may revise them intra-day, typically up to 16 times
4. D.monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module

Answer + AI explanation with Pro

1. A.Inverter insulation fault
2. B.Capacity utilisation factor
3. C.Soiling loss
4. D.String current monitoring

Answer + AI explanation with Pro

1. A.String current monitoring — deviation beyond the error band, about ±15% of available capacity under most state forecasting and scheduling regulations, attracts slab-wise charges that forecasting accuracy directly reduces
2. B.String current monitoring — annual energy over rated capacity times 8760 hours; roughly 17–21% for fixed-tilt solar in India and 25–35% for wind
3. C.String current monitoring — leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
4. D.String current monitoring — monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module

Answer + AI explanation with Pro

1. A.wind and solar generators submit day-ahead 15-minute schedules through a Qualified Coordinating Agency and may revise them intra-day, typically up to 16 times
2. B.gearbox, pitch and yaw systems dominate downtime; OEM service contracts guarantee 95–97% time-based availability with condition monitoring of drivetrain vibration
3. C.dust deposition costs 3–5% or more per month at dry Indian sites without cleaning, so cleaning cycles or dry robotic cleaners are scheduled against water cost
4. D.actual energy divided by the energy the plant would give at STC efficiency for the measured irradiation; healthy Indian plants run at about 75–82%

Answer + AI explanation with Pro

1. A.Capacity utilisation factor
2. B.Inverter insulation fault
3. C.DSM for renewables
4. D.Soiling loss

Answer + AI explanation with Pro

1. A.Soiling loss — deviation beyond the error band, about ±15% of available capacity under most state forecasting and scheduling regulations, attracts slab-wise charges that forecasting accuracy directly reduces
2. B.Soiling loss — monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module
3. C.Soiling loss — leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
4. D.Soiling loss — dust deposition costs 3–5% or more per month at dry Indian sites without cleaning, so cleaning cycles or dry robotic cleaners are scheduled against water cost

Answer + AI explanation with Pro

1. A.gearbox, pitch and yaw systems dominate downtime; OEM service contracts guarantee 95–97% time-based availability with condition monitoring of drivetrain vibration
2. B.deviation beyond the error band, about ±15% of available capacity under most state forecasting and scheduling regulations, attracts slab-wise charges that forecasting accuracy directly reduces
3. C.Riso alarm when array-to-earth resistance falls below the set threshold at dawn, usually from wet connectors, damaged DC cable or moisture in a module junction box
4. D.monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module

Answer + AI explanation with Pro

1. A.Inverter insulation fault
2. B.Soiling loss
3. C.String current monitoring
4. D.Wind turbine O&M

Answer + AI explanation with Pro

1. A.Inverter insulation fault — leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
2. B.Inverter insulation fault — actual energy divided by the energy the plant would give at STC efficiency for the measured irradiation; healthy Indian plants run at about 75–82%
3. C.Inverter insulation fault — annual energy over rated capacity times 8760 hours; roughly 17–21% for fixed-tilt solar in India and 25–35% for wind
4. D.Inverter insulation fault — Riso alarm when array-to-earth resistance falls below the set threshold at dawn, usually from wet connectors, damaged DC cable or moisture in a module junction box

Answer + AI explanation with Pro

1. A.gearbox, pitch and yaw systems dominate downtime; OEM service contracts guarantee 95–97% time-based availability with condition monitoring of drivetrain vibration
2. B.leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
3. C.Riso alarm when array-to-earth resistance falls below the set threshold at dawn, usually from wet connectors, damaged DC cable or moisture in a module junction box
4. D.monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module

Answer + AI explanation with Pro

1. A.Inverter insulation fault
2. B.DSM for renewables
3. C.Potential-induced degradation
4. D.Performance ratio

Answer + AI explanation with Pro

1. A.Potential-induced degradation — gearbox, pitch and yaw systems dominate downtime; OEM service contracts guarantee 95–97% time-based availability with condition monitoring of drivetrain vibration
2. B.Potential-induced degradation — leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
3. C.Potential-induced degradation — annual energy over rated capacity times 8760 hours; roughly 17–21% for fixed-tilt solar in India and 25–35% for wind
4. D.Potential-induced degradation — actual energy divided by the energy the plant would give at STC efficiency for the measured irradiation; healthy Indian plants run at about 75–82%

Answer + AI explanation with Pro

1. A.gearbox, pitch and yaw systems dominate downtime; OEM service contracts guarantee 95–97% time-based availability with condition monitoring of drivetrain vibration
2. B.actual energy divided by the energy the plant would give at STC efficiency for the measured irradiation; healthy Indian plants run at about 75–82%
3. C.wind and solar generators submit day-ahead 15-minute schedules through a Qualified Coordinating Agency and may revise them intra-day, typically up to 16 times
4. D.monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module

Answer + AI explanation with Pro

1. A.Wind turbine O&M
2. B.Performance ratio
3. C.Inverter insulation fault
4. D.String current monitoring

Answer + AI explanation with Pro

1. A.Wind turbine O&M — monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module
2. B.Wind turbine O&M — leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
3. C.Wind turbine O&M — gearbox, pitch and yaw systems dominate downtime; OEM service contracts guarantee 95–97% time-based availability with condition monitoring of drivetrain vibration
4. D.Wind turbine O&M — Riso alarm when array-to-earth resistance falls below the set threshold at dawn, usually from wet connectors, damaged DC cable or moisture in a module junction box

Answer + AI explanation with Pro

1. A.actual energy divided by the energy the plant would give at STC efficiency for the measured irradiation; healthy Indian plants run at about 75–82%
2. B.leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
3. C.gearbox, pitch and yaw systems dominate downtime; OEM service contracts guarantee 95–97% time-based availability with condition monitoring of drivetrain vibration
4. D.wind and solar generators submit day-ahead 15-minute schedules through a Qualified Coordinating Agency and may revise them intra-day, typically up to 16 times

Answer + AI explanation with Pro

1. A.DSM for renewables
2. B.RE forecasting and scheduling
3. C.Performance ratio
4. D.String current monitoring

Answer + AI explanation with Pro

1. A.RE forecasting and scheduling — wind and solar generators submit day-ahead 15-minute schedules through a Qualified Coordinating Agency and may revise them intra-day, typically up to 16 times
2. B.RE forecasting and scheduling — Riso alarm when array-to-earth resistance falls below the set threshold at dawn, usually from wet connectors, damaged DC cable or moisture in a module junction box
3. C.RE forecasting and scheduling — dust deposition costs 3–5% or more per month at dry Indian sites without cleaning, so cleaning cycles or dry robotic cleaners are scheduled against water cost
4. D.RE forecasting and scheduling — actual energy divided by the energy the plant would give at STC efficiency for the measured irradiation; healthy Indian plants run at about 75–82%

Answer + AI explanation with Pro

1. A.leakage between cells and the earthed frame under high negative string voltage erodes output; mitigated by PID-resistant modules, negative-pole earthing or night-time recovery boxes
2. B.annual energy over rated capacity times 8760 hours; roughly 17–21% for fixed-tilt solar in India and 25–35% for wind
3. C.deviation beyond the error band, about ±15% of available capacity under most state forecasting and scheduling regulations, attracts slab-wise charges that forecasting accuracy directly reduces
4. D.wind and solar generators submit day-ahead 15-minute schedules through a Qualified Coordinating Agency and may revise them intra-day, typically up to 16 times

Answer + AI explanation with Pro

1. A.Capacity utilisation factor
2. B.Inverter insulation fault
3. C.RE forecasting and scheduling
4. D.DSM for renewables

Answer + AI explanation with Pro

1. A.DSM for renewables — deviation beyond the error band, about ±15% of available capacity under most state forecasting and scheduling regulations, attracts slab-wise charges that forecasting accuracy directly reduces
2. B.DSM for renewables — gearbox, pitch and yaw systems dominate downtime; OEM service contracts guarantee 95–97% time-based availability with condition monitoring of drivetrain vibration
3. C.DSM for renewables — monitoring boxes or inverter string inputs compare each string's current with its neighbours so an underperformer flags a failed diode, connector or shaded module
4. D.DSM for renewables — wind and solar generators submit day-ahead 15-minute schedules through a Qualified Coordinating Agency and may revise them intra-day, typically up to 16 times

Answer + AI explanation with Pro