AALSO LIFE SUPPORT PRACTICE
EXAM 2025 QUESTIONS AND ANSWERS
100% CORRECT.
A positive displacement pump that utilizes a set of rollers that compress and rotate
across an elastomeric tube to pump a fluid is a:
a) Flexible impeller pump
b) Diaphragm pump
c) Centrifugal pump
d) Peristaltic pump - ANSWERd) Peristaltic pump
According to the diagram, which part of the centrifugal pump does the motor connect
to?
a) Pump casing
b) Impeller
c) Volute
d) Drive shaft flange - ANSWERd) Drive shaft flange
Which of the following life support system components could be categorized as
mechanical filtration?
a) Ultraviolet sterilizer
b) Ozone contact tank
c) Rotating drum filter
d) None of the above - ANSWERc) Rotating drum filter
Which of the following life supporting system components uses high flow rates and
higher pressures to mechanically filter water?
a) Ultraviolet sterilizer
b) Carbon filter
c) High pressure sand filter
d) None of the above - ANSWERc) High pressure sand filter
A ________ valve uses the guillotine action of a solid wall to control the flow of water:
a) Butterfly
b) Ball
c) Gate
d) Globe - ANSWERc) Gate
, A globe valve uses ___________ to control the flow of water:
a) Wafer-like articulating disk
b) Guillotine action of a solid wall
c) Plug and baffle
d) Spherical articulating disk - ANSWERc) Plug and baffle
Which condition can decrease foam fractionator efficiency?
a) Consistent flow rate through the fractionator
b) Large disruptive bubbles in the reaction column
c) Uniform bubble size in the reaction column
d) Higher salinity (such as full strength seawater) - ANSWERb) Large disruptive bubbles
in the reaction column
Before entering a confined space, one should do all of the following EXCEPT:
a) Lock out/tag out all mechanical equipment
b) Ensure adequate ventilation
c) Test oxygen levels and dangerous gases
d) Securely tie a rope around one's waist to ensure recuse if necessary - ANSWERc)
Test oxygen levels and dangerous gases
Which of the following is a type of chemical filtration?
a) Degas tower
b) Carbon filter
c) Sand filter
d) Bag filter - ANSWERb) Carbon filter
Channeling in a sand filter can be caused by
a) Improper backwashing frequency
b) Broken lateral
c) Low filtering flow rates
d) Both A&B - ANSWERd) Both A&B
An aquarium to be used as a sump tank of 6 ft long, 2 ft wide, and 2 ft deep. While
normally the sump will be 1/3 full. How many gallons will the sump hold when normally
operating? (Round answer to the nearest gallon)
a) 120 gallons
b) 24 gallons
c) 179 gallons
d) 60 gallons - ANSWERCalculations:
6ft * 2ft * 2ft = 24 ft3
EXAM 2025 QUESTIONS AND ANSWERS
100% CORRECT.
A positive displacement pump that utilizes a set of rollers that compress and rotate
across an elastomeric tube to pump a fluid is a:
a) Flexible impeller pump
b) Diaphragm pump
c) Centrifugal pump
d) Peristaltic pump - ANSWERd) Peristaltic pump
According to the diagram, which part of the centrifugal pump does the motor connect
to?
a) Pump casing
b) Impeller
c) Volute
d) Drive shaft flange - ANSWERd) Drive shaft flange
Which of the following life support system components could be categorized as
mechanical filtration?
a) Ultraviolet sterilizer
b) Ozone contact tank
c) Rotating drum filter
d) None of the above - ANSWERc) Rotating drum filter
Which of the following life supporting system components uses high flow rates and
higher pressures to mechanically filter water?
a) Ultraviolet sterilizer
b) Carbon filter
c) High pressure sand filter
d) None of the above - ANSWERc) High pressure sand filter
A ________ valve uses the guillotine action of a solid wall to control the flow of water:
a) Butterfly
b) Ball
c) Gate
d) Globe - ANSWERc) Gate
, A globe valve uses ___________ to control the flow of water:
a) Wafer-like articulating disk
b) Guillotine action of a solid wall
c) Plug and baffle
d) Spherical articulating disk - ANSWERc) Plug and baffle
Which condition can decrease foam fractionator efficiency?
a) Consistent flow rate through the fractionator
b) Large disruptive bubbles in the reaction column
c) Uniform bubble size in the reaction column
d) Higher salinity (such as full strength seawater) - ANSWERb) Large disruptive bubbles
in the reaction column
Before entering a confined space, one should do all of the following EXCEPT:
a) Lock out/tag out all mechanical equipment
b) Ensure adequate ventilation
c) Test oxygen levels and dangerous gases
d) Securely tie a rope around one's waist to ensure recuse if necessary - ANSWERc)
Test oxygen levels and dangerous gases
Which of the following is a type of chemical filtration?
a) Degas tower
b) Carbon filter
c) Sand filter
d) Bag filter - ANSWERb) Carbon filter
Channeling in a sand filter can be caused by
a) Improper backwashing frequency
b) Broken lateral
c) Low filtering flow rates
d) Both A&B - ANSWERd) Both A&B
An aquarium to be used as a sump tank of 6 ft long, 2 ft wide, and 2 ft deep. While
normally the sump will be 1/3 full. How many gallons will the sump hold when normally
operating? (Round answer to the nearest gallon)
a) 120 gallons
b) 24 gallons
c) 179 gallons
d) 60 gallons - ANSWERCalculations:
6ft * 2ft * 2ft = 24 ft3
