Exam (elaborations)
Texas Irrigator Practice Test Section 4: Q’s And A’s
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Texas Irrigator Practice Test Section 4: Q’s And A’s
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Texas Irrigator Practice Test Section 4: Q’s And A’sWhat happens when there is excessive pressure at the heads?
a). They will not work
b). Less GPM will flow
c). Misting or fogging
d). The heads need adjusting Right Ans - c). Misting or fogging
If the GPM are doubled, the PSI:
a). doubles.
b). triples.
c). quadruples.
d). stays the same Right Ans - c). quadruples.
Hydraulics is:
a). water in motion.
b). the science of dynamic and static water.
c). the study of irrigation designs. d). study of water pressure. Right Ans -
b). the science of dynamic and static water.
What is the weight of one gallon of water?
a). 8.3 pounds
b). 7.3 pounds
c). 62.4 pounds
d). 3.8 pounds Right Ans - a). 8.3 pounds
62.4 pounds represents the weight of:
a). 5 gallons of water.
b). a liter of water.
c). a gallon of water.
d). a cubic foot of water. Right Ans - d). a cubic foot of water.
What does PSI stand for?
a). pounds per square inch
b). the speed of water
c). pressure per square inch
d). pounds per square increment Right Ans - a). pounds per square inch
How many feet of water (in height) does it take to equal 1 PSI?
, a). .433
b). 2.31
c). .866
d). 4.33 Right Ans - b). 2.31
One foot high of water will create:
a). 4.62 PSI
b). 2.31 PSI
c). .433 PSI
d). .866 PSI Right Ans - c). .433 PSI
How many feet of head are needed to produce 65 psi?
a). 28.2
b). 100
c). 150.1
d). 37.4 Right Ans - c). 150.1
65 ÷ .433 = 150.12 feet of head
If you have 167 feet of head, what is the psi?
a). 385.7
b). 83.5
c). 118.31
d). 72.3 Right Ans - d). 72.3
167 ÷ .433 = 72.31 feet of head
There is a 70' water tower on a hill that is 150' high. The water pressure at a
home, being serviced by this water tower, is 70 psi. What is the feet of head
difference between the home and the base of the hill?
a). 58.3
b). 30.3
c). 220
d). 61.43 Right Ans - a). 58.3
1). 70 psi / .433 = 161.66 feet of head to create 70 PSI at the house
2). 220 (70' water tower plus 150' fill) - 161.66 = 58.34 feet of head
An elevation gain in the piping will yield:
a). a gain in psi.
b). no change in psi.
c). loss in psi.
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