AALSO Exam 1 Questions with correct
Answers
What type of positive displacement pump uses a combination of the reciprocating action
of a solid membrane and a pair of check valves to pump a fluid?
a- flexible impeller pump
b- peristaltic pump
c- centrifugal pump
d- diaphragm pump - Correct Answers -diaphragm pump
Which of the following life support system components uses high flow rates through a
vessel to mechanically trap particulates from the water?
a- rapid sand filter
b- granular activated carbon
c- ultraviolet sterilizer
d- none of the above - Correct Answers -rapid sand filter
What type of valve uses an articulating sphere to control the flow of water?
a- globe
b- ball
c- butterfly
d- gate - Correct Answers –ball
T/F:When the temperature of water is increased, the waters ability to hold dissolved
oxygen is increased - Correct Answers -F
T/F: Oil and water do not mix well at standard temperature and pressure because oil is
a non-polar substance and water is a polar substance - Correct Answers -T
A solution whose pH is 4 is considered to be a _____ substance - Correct Answers -
acidic
A solution whose pH is 9 is considered to be a _____ substance - Correct Answers -
basic
Which of the following actions would increase foam fractionator efficiency?
a- decreasing contact time between water and bubbles
b- decreasing salinity, such as with complete fresh water
c- increasing bubble size through the fractionator
, d- increasing the contact time within the foam fractionator - Correct Answers -increasing
the contact time within the foam fractionator
Which of the following would a carbon filter not be used for?
a- denitrification of an aquarium
b- ozone destruction post-injection
c- removal of chlorine in makeup water
d- none of the above - Correct Answers -denitrification of an aquarium
What two types of pumps are commonly used for chemical dosing applications because
of their ability to reliably deliver small volumes of liquid to a process stream or vessel?
a- axial flow and flexible impeller pumps
b- centrifugal and positive displacement pumps
c- close coupled and piston pumps
d- peristaltic and diaphragm pumps - Correct Answers -centrifugal and positive
displacement pumps
As time goes by, you notice that the difference in pressure between the influent and
effluent of your sand filter has increased. What is the most likely cause of this change in
pressure?
a- the flow rate has been increased by turning down the frequency of the VFD
b- one of the pressure gauges has leaked oil and is no longer reading correctly
c- the sand filter has occluded during its normal operation
d- the sand filter has a broken lateral which has caused some of the media to escape
into the degas tower - Correct Answers -the sand filter has occluded during its normal
operation
Which of the following LSS components is a mechanical, self-cleaning filter that uses
gravity for water flow across the filtration screen?
a- rapid sand filter
b- bead filter
c- rotating drum filter
d- none of the above - Correct Answers -rotating drum filter
For a sand filter in normal operation (filtration mode) what can typically be said about
the hydraulic loading rate?
a- it is low enough to keep from entraining gass
b- it is lower than the backwash rate
c- it is higher than the backwash rate
d- it is equal to the backwash rate - Correct Answers -it is lower than the backwash rate
What does a butterfly valve use to control the flow of water?
a- wafer-like articulating disk
b- plug and baffle
c- spherical articulating disk
d- guillotine action of a solid wall - Correct Answers -wafer-like articulating disk
Answers
What type of positive displacement pump uses a combination of the reciprocating action
of a solid membrane and a pair of check valves to pump a fluid?
a- flexible impeller pump
b- peristaltic pump
c- centrifugal pump
d- diaphragm pump - Correct Answers -diaphragm pump
Which of the following life support system components uses high flow rates through a
vessel to mechanically trap particulates from the water?
a- rapid sand filter
b- granular activated carbon
c- ultraviolet sterilizer
d- none of the above - Correct Answers -rapid sand filter
What type of valve uses an articulating sphere to control the flow of water?
a- globe
b- ball
c- butterfly
d- gate - Correct Answers –ball
T/F:When the temperature of water is increased, the waters ability to hold dissolved
oxygen is increased - Correct Answers -F
T/F: Oil and water do not mix well at standard temperature and pressure because oil is
a non-polar substance and water is a polar substance - Correct Answers -T
A solution whose pH is 4 is considered to be a _____ substance - Correct Answers -
acidic
A solution whose pH is 9 is considered to be a _____ substance - Correct Answers -
basic
Which of the following actions would increase foam fractionator efficiency?
a- decreasing contact time between water and bubbles
b- decreasing salinity, such as with complete fresh water
c- increasing bubble size through the fractionator
, d- increasing the contact time within the foam fractionator - Correct Answers -increasing
the contact time within the foam fractionator
Which of the following would a carbon filter not be used for?
a- denitrification of an aquarium
b- ozone destruction post-injection
c- removal of chlorine in makeup water
d- none of the above - Correct Answers -denitrification of an aquarium
What two types of pumps are commonly used for chemical dosing applications because
of their ability to reliably deliver small volumes of liquid to a process stream or vessel?
a- axial flow and flexible impeller pumps
b- centrifugal and positive displacement pumps
c- close coupled and piston pumps
d- peristaltic and diaphragm pumps - Correct Answers -centrifugal and positive
displacement pumps
As time goes by, you notice that the difference in pressure between the influent and
effluent of your sand filter has increased. What is the most likely cause of this change in
pressure?
a- the flow rate has been increased by turning down the frequency of the VFD
b- one of the pressure gauges has leaked oil and is no longer reading correctly
c- the sand filter has occluded during its normal operation
d- the sand filter has a broken lateral which has caused some of the media to escape
into the degas tower - Correct Answers -the sand filter has occluded during its normal
operation
Which of the following LSS components is a mechanical, self-cleaning filter that uses
gravity for water flow across the filtration screen?
a- rapid sand filter
b- bead filter
c- rotating drum filter
d- none of the above - Correct Answers -rotating drum filter
For a sand filter in normal operation (filtration mode) what can typically be said about
the hydraulic loading rate?
a- it is low enough to keep from entraining gass
b- it is lower than the backwash rate
c- it is higher than the backwash rate
d- it is equal to the backwash rate - Correct Answers -it is lower than the backwash rate
What does a butterfly valve use to control the flow of water?
a- wafer-like articulating disk
b- plug and baffle
c- spherical articulating disk
d- guillotine action of a solid wall - Correct Answers -wafer-like articulating disk
