ch 12 a

Question 1

in most hydroelectric developments the head and water flow will

Answer 1

fluctuate

Question 2

intake design has a large effect on

Answer 2

all three

Question 3

a partially clogged trash rack will

Answer 3

causes a decrease in the effective head

Question 4

wood stave pipe would probably not be used for

Answer 4

heads above 500 feet

Question 5

an open conduit system implies

Answer 5

the presence of a free surface

Question 6

the best canal cross section from a hydraulic point of view is defined as

Answer 6

the one that has a minimum wetted perimeter

Question 7

the least efficient type of high line conduit is that type which

Answer 7

has the greatest effect on the available head

Question 8

steel pipe is used more extensively than any other type of pipe for penstock construction because

Answer 8

of the degree of flexibility it offers in satisfying design criteria in all of the above areas

Question 9

one of the major advantages of using a pressure tunnel in a power conduit system is that

Answer 9

it permits full use of the available head

Question 10

positive water hammer pressure caused by a sudden decrease in the demand for water can be eliminated by

Answer 10

any one of the above

Question 11

negative water hammer pressure is created by

Answer 11

a sudden increase in the demand for water

Question 12

which of the below conditions would probably not cause the water level in the riser of a differential surge tank to fall

Answer 12

a load rejection

Question 13

pumped storage type of hydroelectric developments implies a capability for

Answer 13

all of the above

Question 14

the best hydraulic rectangular cross-section occurs when (b = bottom width, y = water depth)

Answer 14

y=b/2

Question 15

penstock velocities may range from

Answer 15

6 to 20 ft/sec