Pumped Storage Hydropower MCQ

Question 1

Consider the following statements about hydropower and pumped-storage hydropower: 1. The volume of water flow and the head help determine available energy in moving water. 2. At hydropower plants, water can flow through a penstock and turn turbine blades. 3. Pumped-storage systems generally produce more electricity than they use for pumping. Which of the statements given above are correct?

Accepted Answer

Statements 1 and 2 are correct. Statement 3 is incorrect because EIA states that pumped-storage systems generally use more electricity for pumping than they produce with the stored water, so their net generation balance is negative.

Question 2

Consider the following statements about DPR and concurrence timelines for pumped storage projects in India:
1. CEA's revised process reduced the timeline for concurrence of DPR from 90 days to 50 days for all types of PSPs.
2. For preparation of DPRs, timelines for Himalayan and non-Himalayan PSPs were reduced from 900 days to 840 and 690 days respectively, depending on geology.
3. CEA need not do tariff or financial evaluation for PSPs allotted through tariff-based competitive bidding, integrated renewable projects or captive plants.
4. The 2023 framework increased DPR preparation timelines from 690 days to 900 days for non-Himalayan PSPs.
Which of the statements given above are correct?

Accepted Answer

Statements 1, 2 and 3 are correct. The concurrence timeline was cut from 90 to 50 days; DPR preparation timelines were reduced to 840 and 690 days; and tariff or financial evaluation is not required for specified PSP allotment routes. Statement 4 is false because the direction of change was reduction, not increase.

Question 3

Consider the following statements about grid services from pumped storage hydropower:
1. It can support frequency regulation.
2. It can support voltage stabilization.
3. Black-start capability is not associated with pumped storage hydropower.
Which of the statements given above are correct?

Accepted Answer

Statements 1 and 2 are correct because frequency regulation and voltage stabilization are named services. Statement 3 is incorrect: black-start capability is also listed as a pumped storage grid service.

Question 4

Consider the following statements about the operating cycle of pumped storage hydropower:
1. A pumped storage plant can use the same water repeatedly.
2. After electricity generation, the water remains in the upper reservoir until demand falls.
3. Turbines may spin backward to pump water back to the upper reservoir.
Which of the statements given above are correct?

Accepted Answer

Statement 1 is correct because pumped storage can recycle the same water. Statement 2 is incorrect: after generation, water flows into the lower reservoir and remains there until demand lowers. Statement 3 is correct: turbines can spin backward to pump water upward again.

Question 5

Consider the following statements about siting and water connection in pumped storage:
1. Closed-loop pumped storage does not use water bodies outside its two reservoirs.
2. Open-loop pumped storage uses an outside natural water source for one or both reservoirs.
3. Closed-loop pumped storage is defined by the use of a natural river as both upper and lower reservoirs.
4. Because of off-stream siting, closed-loop projects may reduce aquatic and terrestrial impacts relative to open-loop projects.
Which of the statements given above are correct?

Accepted Answer

Statement 1 is true for closed-loop systems. Statement 2 is true for open-loop systems. Statement 3 is false because closed-loop systems are not defined by using a natural river as reservoirs; they avoid an outside natural-water connection. Statement 4 is true based on the environmental comparison.

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