2. What is one disadvantage of hydroelectric energy? A. It does not work if we don't have coal as a fuel. B. It doesn't work if it is not windy. C. It doesn't work if we don't have rivers or moving water nearby. D. It doesn't work if we don't have efficient combustion chambers. 3. What is the work of penstock in hydroelectric power plants? A. A place behind a dam where water is stored B. Reduce the water hammering effect in pipes which can cause damage to pipes. C. Long pipe that carries the water flowing from the reservoir towards the power generation unit D. Is an enlarged body of water to store water temporarily to meet load fluctuations. 4. Hydroelectric power plants have very............. A. Low installation cost B. Low running cost C. Short time to erection the station. D. High fuel charges 5. Power plant without pondage is classified as a kind of. A. Pumped storage power plant B. Run-of-river power plant C. Storage plant D. Steam power plant 6. In pumped storage power plants, the usual construction would be a tailwater pond and a headwater pond connected through....... A. Penstock B. Dam C. Surge tank D. Forebay 7. Energy is stored in the water as........... A. Electrical energy B. Renewable source of energy C. Kinetic energy D. Gravitational potential energy