Brae 340 exam 2 questions with verified
answered graded A+
What is an approximate average DU value for drip hose? - correct answer ✔✔0.86
What should you do before entering the field? - correct answer ✔✔Obtain a piping layout from
the grower or trace one from a Google Earth printout
How should you hold the gauge while taking pressure measurements? - correct answer ✔✔At
the same elevation of the hose (at the operating level of the hose)
The two major components of non-uniformity in above-ground drip irrigation systems are: -
correct answer ✔✔Pressure differences and plugging
What is the approximate "x" value of PC emitters (above their minimum pressure)? - correct
answer ✔✔0
How do you determine the five pressures used for pressure compensating emitters? - correct
answer ✔✔Look over your pressure data. Select the highest and lowest pressure readings and
write down three numbers that are spaced evenly between the two.
DUΔpressure is caused by: - correct answer ✔✔differences in pressure among emitters
throughout a field
What is a possible solution for a significant pressure difference along the mainline? - correct
answer ✔✔Install adjustable pressure regulators at the heads of the manifolds or adjust existing
pressure regulators
, How many DU values are averaged in the DUother equations (in other words, how many tests
are performed for DUother)? - correct answer ✔✔Three
To prevent plugging, a good recommendation is to: - correct answer ✔✔Add acid to the water
Given the following values, what is the DUlq of this field? - correct answer ✔✔0.82
DU = Ave LQ / Ave All
The LQ is this case is the lowest 2 values.
Find the DU due to differences in pressure with the given information below.
Given: x= 0.515 k= 0.755 - correct answer ✔✔0.76
First, determine the flow rate from each emitter using Q = kPx. For example, the first emitter
would have a flow rate = 0.755 * 10.60.515 = 2.55 gph. Once you have all of the flow rates, for
each emitter, use DU = Ave LQ / Ave All to determine the DU due to pressure differences.
irrigation type:
drip - correct answer ✔✔irrigation method:
Tape, Sub-surface tape, On-line emitter
irrigation type:
micro - correct answer ✔✔irrigation method:
Fanjet, Mini sprinklers, Spaghetti tube
irrigation type:
surface - correct answer ✔✔irrigation method:
Contour furrow, Flood, Border Strip
answered graded A+
What is an approximate average DU value for drip hose? - correct answer ✔✔0.86
What should you do before entering the field? - correct answer ✔✔Obtain a piping layout from
the grower or trace one from a Google Earth printout
How should you hold the gauge while taking pressure measurements? - correct answer ✔✔At
the same elevation of the hose (at the operating level of the hose)
The two major components of non-uniformity in above-ground drip irrigation systems are: -
correct answer ✔✔Pressure differences and plugging
What is the approximate "x" value of PC emitters (above their minimum pressure)? - correct
answer ✔✔0
How do you determine the five pressures used for pressure compensating emitters? - correct
answer ✔✔Look over your pressure data. Select the highest and lowest pressure readings and
write down three numbers that are spaced evenly between the two.
DUΔpressure is caused by: - correct answer ✔✔differences in pressure among emitters
throughout a field
What is a possible solution for a significant pressure difference along the mainline? - correct
answer ✔✔Install adjustable pressure regulators at the heads of the manifolds or adjust existing
pressure regulators
, How many DU values are averaged in the DUother equations (in other words, how many tests
are performed for DUother)? - correct answer ✔✔Three
To prevent plugging, a good recommendation is to: - correct answer ✔✔Add acid to the water
Given the following values, what is the DUlq of this field? - correct answer ✔✔0.82
DU = Ave LQ / Ave All
The LQ is this case is the lowest 2 values.
Find the DU due to differences in pressure with the given information below.
Given: x= 0.515 k= 0.755 - correct answer ✔✔0.76
First, determine the flow rate from each emitter using Q = kPx. For example, the first emitter
would have a flow rate = 0.755 * 10.60.515 = 2.55 gph. Once you have all of the flow rates, for
each emitter, use DU = Ave LQ / Ave All to determine the DU due to pressure differences.
irrigation type:
drip - correct answer ✔✔irrigation method:
Tape, Sub-surface tape, On-line emitter
irrigation type:
micro - correct answer ✔✔irrigation method:
Fanjet, Mini sprinklers, Spaghetti tube
irrigation type:
surface - correct answer ✔✔irrigation method:
Contour furrow, Flood, Border Strip
