Question 1

​Small-scale hydropower installations that rely on long pipes to convey water to the turbine experience lower efficiencies than fossil fuel and nuclear power plants.

Accepted Answer

A) True 
 B)False  False

Question 2

​In the equation P = rgQH, the _____ measures the height in feet (ft) from which water descends and determines its pressure.

Accepted Answer

A)  ​Q 
B)  ​g 
C)  ​H 
D)  ​ρ C

Question 3

​The _____ is a channel or pipe that connects the water intake to the turbine and often includes a control gate for regulating flow rate.

Accepted Answer

A)  ​powerhouse 
B)  ​tailrace 
C)  ​intake pipe 
D)  ​penstock D

Question 4

​Hydroelectric generators cannot be started or stopped quickly.

Accepted Answer

A) True 
 B)False

Question 5

​Which of the following statements is true regarding the environmental impact of large-scale hydroelectric plants?

Accepted Answer

A)  ​The release of water timed to accommodate peak demands in electricity bears a striking resemblance to natural flood cycles. 
B)  ​Dams can inundate productive land, destroy wildlife habitat, and interrupt fish migration. 
C)  ​Water released from dams is usually cooler than the undammed river, preventing undue stress on fish and other organisms. 
D)  ​When dams flood vegetated land,  the resulting decomposition fertilizes the land for crop growth.

Question 6

Impact turbines are used for high-flow facilities and are not common in residential and small-scale commercial systems.

Accepted Answer

A) True 
 B)False

Question 7

​_____ turbines are not submerged and use nozzles to focus high-pressure jets of water into curved bowls on the rim of a wheel.

Accepted Answer

A)  ​Impact 
B)  ​Reaction 
C)  ​Francis 
D)  ​Kaplan

Question 8

​Most commercial power plants use reaction turbines, designing the turbines to permit fish and other small objects to pass through unharmed.

Accepted Answer

A) True 
 B)False

Question 9

​Hydropower, unlike solar and wind, offers predictable and reliable energy.

Accepted Answer

A) True 
 B)False

Question 10

​Which of the following statements is true regarding micro hydro systems?

Accepted Answer

A)  ​Micro hydro systems range in capacity from less than 100 kW to more than 1 million kW. 
B)  ​The constancy and predictability of hydropower, even if the available resource is small, dramatically improve off-grid systems. 
C)  ​For off-grid systems, micro hydro is an unpredictable and unstable source of energy. 
D)  ​Even without stored resources of a reservoir, power produced by micro hydro installations does not vary with the seasonal flow of the water supply.

Exam 9: Hydropower

​Small-scale hydropower installations that rely on long pipes to convey water to the turbine experience lower efficiencies than fossil fuel and nuclear power plants.

​In the equation P = rgQH, the _____ measures the height in feet (ft) from which water descends and determines its pressure.

​The _____ is a channel or pipe that connects the water intake to the turbine and often includes a control gate for regulating flow rate.

​Hydroelectric generators cannot be started or stopped quickly.

​Which of the following statements is true regarding the environmental impact of large-scale hydroelectric plants?

Impact turbines are used for high-flow facilities and are not common in residential and small-scale commercial systems.

​_____ turbines are not submerged and use nozzles to focus high-pressure jets of water into curved bowls on the rim of a wheel.

​Most commercial power plants use reaction turbines, designing the turbines to permit fish and other small objects to pass through unharmed.

​Hydropower, unlike solar and wind, offers predictable and reliable energy.

​Which of the following statements is true regarding micro hydro systems?

Small-scale hydropower installations that rely on long pipes to convey water to the turbine experience lower efficiencies than fossil fuel and nuclear power plants.

In the equation P = rgQH, the _____ measures the height in feet (ft) from which water descends and determines its pressure.

The _____ is a channel or pipe that connects the water intake to the turbine and often includes a control gate for regulating flow rate.

Hydroelectric generators cannot be started or stopped quickly.

Which of the following statements is true regarding the environmental impact of large-scale hydroelectric plants?

_____ turbines are not submerged and use nozzles to focus high-pressure jets of water into curved bowls on the rim of a wheel.

Most commercial power plants use reaction turbines, designing the turbines to permit fish and other small objects to pass through unharmed.

Hydropower, unlike solar and wind, offers predictable and reliable energy.

Which of the following statements is true regarding micro hydro systems?