Irrigation Exam 2 Practice Test
T F Surge irrigation is used along with center pivot swing arms to provide more uniform
irrigation? - Correct Answers -False
T F Worn or cracked gaskets can be replaced to reduce leaks between sections of
aluminum sprinkler pipe by the farmer? - Correct Answers -True
T F Gaskets between 3 inch hand line sprinklers are made of only one material,
rubberized leather. - Correct Answers -False
T F The lateral carries water from the pump to the mainline. - Correct Answers -False
T F Organic matter percentage and soil texture affect the intake or infiltration rate of
water? - Correct Answers –True
________is the rapid rise in pressure within pipes in any water system created by the
rapid change in velocity of the water - Correct Answers -Water hammer
Small implosions on the trailing edge o an impeller caused by the imploding water
vapors is called_______ - Correct Answers -cavitation
A head of 11.55 feet is equal to how many psi? - Correct Answers -5
Head means? - Correct Answers -height of water above a certain point
T F Trimming an impeller means to put it into a different volute case? - Correct Answers
-False
T F If water is applied to a soil in excess of the infiltration rate, runoff will occur? -
Correct Answers -True
T F The volute case is a protective covering on a center pivot "big gun?" - Correct
Answers -False
T F Pump panels contain the electrical protection and on/off switch for pump motors? -
Correct Answers -True
, T F A displacement pump can have the discharge valve closed most of the way without
damaging the pump? - Correct Answers -False
________impellers can pass the largest debris but have lower pressure capabilities. -
Correct Answers -Open
_______ is used to convey water from the mainline to furrows in a surface irrigation
system where it is then discharged through small adjustable openings in the pipe. -
Correct Answers -Gated Pipe
Most industrial pumps run on what phase of power? - Correct Answers -Three
Two examples of______ -duty loads include furnace fans and air compressors. -
Correct Answers -intermittent
The vertical column of water 2.31 feet high will an exert a pressure of____ psi on a
gauge at the base - Correct Answers -1 psi
A _________ is a series of graphs made by pump engineers providing information
about out put characteristics of the pump. - Correct Answers -Pump Curve
Polyacrylamide is used for ______ control. - Correct Answers -Erosion
This is a type of surface irrigation where the field is perfectly level, water elevation is
raised then subsides, no run off is permitted, and is more efficient that other types of
surface irrigation. _______ - Correct Answers -Basin Irrigation
What is used to keep debris from plugging emitters on a drip system? - Correct Answers
-Filter
A tank at the top of the hill is used to supply irrigation water to a turnip field. The
elevation difference is 45 feet. Will the resulting pressure be suitable for a wheel line
sprinkler system? Why or why not? - Correct Answers -No, the Psi is not high enough.
P=.433H Pressure= 19 PSI
What is the function of a valve opener. Where would you find one? - Correct Answers -
Allows water to pass from mainline to the lateral, hand line or wheeline
What are the four types of microirrigation systems discussed in class? - Correct
Answers -Drip
Subsurface
Bubbler
Spray
What material are most impact sprinkler heads made of? - Correct Answers -Brass
T F Surge irrigation is used along with center pivot swing arms to provide more uniform
irrigation? - Correct Answers -False
T F Worn or cracked gaskets can be replaced to reduce leaks between sections of
aluminum sprinkler pipe by the farmer? - Correct Answers -True
T F Gaskets between 3 inch hand line sprinklers are made of only one material,
rubberized leather. - Correct Answers -False
T F The lateral carries water from the pump to the mainline. - Correct Answers -False
T F Organic matter percentage and soil texture affect the intake or infiltration rate of
water? - Correct Answers –True
________is the rapid rise in pressure within pipes in any water system created by the
rapid change in velocity of the water - Correct Answers -Water hammer
Small implosions on the trailing edge o an impeller caused by the imploding water
vapors is called_______ - Correct Answers -cavitation
A head of 11.55 feet is equal to how many psi? - Correct Answers -5
Head means? - Correct Answers -height of water above a certain point
T F Trimming an impeller means to put it into a different volute case? - Correct Answers
-False
T F If water is applied to a soil in excess of the infiltration rate, runoff will occur? -
Correct Answers -True
T F The volute case is a protective covering on a center pivot "big gun?" - Correct
Answers -False
T F Pump panels contain the electrical protection and on/off switch for pump motors? -
Correct Answers -True
, T F A displacement pump can have the discharge valve closed most of the way without
damaging the pump? - Correct Answers -False
________impellers can pass the largest debris but have lower pressure capabilities. -
Correct Answers -Open
_______ is used to convey water from the mainline to furrows in a surface irrigation
system where it is then discharged through small adjustable openings in the pipe. -
Correct Answers -Gated Pipe
Most industrial pumps run on what phase of power? - Correct Answers -Three
Two examples of______ -duty loads include furnace fans and air compressors. -
Correct Answers -intermittent
The vertical column of water 2.31 feet high will an exert a pressure of____ psi on a
gauge at the base - Correct Answers -1 psi
A _________ is a series of graphs made by pump engineers providing information
about out put characteristics of the pump. - Correct Answers -Pump Curve
Polyacrylamide is used for ______ control. - Correct Answers -Erosion
This is a type of surface irrigation where the field is perfectly level, water elevation is
raised then subsides, no run off is permitted, and is more efficient that other types of
surface irrigation. _______ - Correct Answers -Basin Irrigation
What is used to keep debris from plugging emitters on a drip system? - Correct Answers
-Filter
A tank at the top of the hill is used to supply irrigation water to a turnip field. The
elevation difference is 45 feet. Will the resulting pressure be suitable for a wheel line
sprinkler system? Why or why not? - Correct Answers -No, the Psi is not high enough.
P=.433H Pressure= 19 PSI
What is the function of a valve opener. Where would you find one? - Correct Answers -
Allows water to pass from mainline to the lateral, hand line or wheeline
What are the four types of microirrigation systems discussed in class? - Correct
Answers -Drip
Subsurface
Bubbler
Spray
What material are most impact sprinkler heads made of? - Correct Answers -Brass
