51. Which type of turbine is most commonly used in hydroelectric power plants?
a. Francis turbine
b. Pelton turbine
c. Kaplan turbine
d. Tesla turbine
52. Which of the following is a disadvantage of a Pelton turbine?
a. It is expensive to manufacture
b. It requires a large amount of water
c. It is not efficient at low head heights
d. It is not suitable for high flow rates
53. Which of the following is a characteristic of a Kaplan turbine?
a. It is most efficient at high head heights
b. It has adjustable blades
c. It is suitable for low flow rates
d. It is not suitable for variable flow rates
54. What is the purpose of a draft tube in a hydroelectric power plant?
a. To regulate the flow of water
b. To store water
c. To increase the pressure of water
d. To decrease the pressure of water
55. Which of the following is an advantage of a pumped-storage hydroelectric power plant?
a. It can be used to store excess electricity
b. It requires less water than a conventional hydroelectric power plant
c. It is more efficient than a conventional hydroelectric power plant
d. It does not require a dam to be built
