b) A thin layer of water flows down along the surface of a hill. The water is exposed to the atmosphere. Which of the following head may increase as the water flows down? Pressure head Elevation head Kinetic head c) As a diver submerges deeper into the ocean, the buoyancy he feels should... Remain the same Increase Decrease None d) Mark the best efficiency point of the following pump when the impeller size of 10 inches.
b) A thin layer of water flows down along the surface of a hill. The water is exposed to the atmosphere. Which of the following head may increase as the water flows down? Pressure head Elevation head Kinetic head c) As a diver submerges deeper into the ocean, the buoyancy he feels should... Remain the same Increase Decrease None d) Mark the best efficiency point of the following pump when the impeller size of 10 inches.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:b) A thin layer of water flows down along the surface of a hill. The water is exposed to the
atmosphere. Which of the following head may increase as the water flows down?
Pressure head
Elevation head
c) As a diver submerges deeper into the ocean, the buoyancy he feels should...
Remain the same
Total head (m)
140
120
d) Mark the best efficiency point of the following pump when the impeller size of 10 inches.
100
80
60
40
20
NPSH, (m)
ONA
Total head (n)
450
NPSH, (n)
400
350
€300
250
200
100
20
Increase
Impeller diameter
10 in 31-36-4146 151
10
150 6 in.
8 in
9 in
0
0
7 in y
31
5 HP
50
0 25 50 75 100 125
36 41 146
3 HP
46
200
Decrease
400
54 56 57 58
6 in
58.7
15 HP:
600
7 in
58
46
800
Capacity (L/min)
20 HP
Kinetic head
25 HP
51
57
1000
30 HP
7.5 HP 10 HP
150 175 200 225 250 275 300 325 350 375
8 in 9 in
10 in
25 50 75 100 125 150 175 200 225 250 275 300 325 350 375
Capacity (gal/min)
2X3-10
3500 RPM
40 HP
50 HP
1200
1400
None
FIGURE 13.28 Complete pump performance chart for a 2 X 3 10 centrifugal pump
at 3500 rpm.
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