WASTEWATER COLLECTIONS (Class II)
QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
The amount of oxygen that nay become dissolved in a given amount of water is MOST related to... -
ANSWER Tempertaure
The gas most commonly associated with septic wastewater is... - ANSWER Hydrogen sulfide
What determines the amount of hydrogen sulfide produced in a sewer? - ANSWER pH
Four conditions are necessary to create an explosion. Three of these conditions are: combustible gas,
adequate oxygen, and sufficient heat.
What is the fourth condition? - ANSWER Proper mixing of gas and oxygen
One kilowatt is the equivalent of _____________ horsepower. - ANSWER 1.34
The lack of an unpleasant odor in a manhole, lift station, or other structures does NOT always mean that
no dangerous gases are present because... - ANSWER -Most dangerous gases have no odor
-Oxygen may still be lacking
-Some gases deaden the sense of smell
As the impeller wears on a pump, the pump efficiency will... - ANSWER Decrease
How closely an instrument measures the actual value of the process variable being measured is called
its... - ANSWER Accuracy
, Vibrations in pumps may be caused by improper motor-pump... - ANSWER Alignment
Advantages of a video tape recording system include... - ANSWER Length and severity of defective areas
can be recorded
The MOST widely used type of prime mover in a pumping plant is... - ANSWER Electric motor
"Schedule 40" refers to... - ANSWER Wall thickness
Hazards that may damage a TV camera going through a sewer include... - ANSWER - Deep water that
submerges the camera
- Fogging of optical lens
- Offset joints
Centrifugal pump parts include...
Diaphragm?
Piston?
Rotor?
Volute? - ANSWER Volute
When packing a centrifugal pump, how should the packing gland be tightened? - ANSWER Slowly, over a
period of several hours
What factors should be considered when providing trench shoring? - ANSWER Structures or sources of
vibration near trenches
QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
The amount of oxygen that nay become dissolved in a given amount of water is MOST related to... -
ANSWER Tempertaure
The gas most commonly associated with septic wastewater is... - ANSWER Hydrogen sulfide
What determines the amount of hydrogen sulfide produced in a sewer? - ANSWER pH
Four conditions are necessary to create an explosion. Three of these conditions are: combustible gas,
adequate oxygen, and sufficient heat.
What is the fourth condition? - ANSWER Proper mixing of gas and oxygen
One kilowatt is the equivalent of _____________ horsepower. - ANSWER 1.34
The lack of an unpleasant odor in a manhole, lift station, or other structures does NOT always mean that
no dangerous gases are present because... - ANSWER -Most dangerous gases have no odor
-Oxygen may still be lacking
-Some gases deaden the sense of smell
As the impeller wears on a pump, the pump efficiency will... - ANSWER Decrease
How closely an instrument measures the actual value of the process variable being measured is called
its... - ANSWER Accuracy
, Vibrations in pumps may be caused by improper motor-pump... - ANSWER Alignment
Advantages of a video tape recording system include... - ANSWER Length and severity of defective areas
can be recorded
The MOST widely used type of prime mover in a pumping plant is... - ANSWER Electric motor
"Schedule 40" refers to... - ANSWER Wall thickness
Hazards that may damage a TV camera going through a sewer include... - ANSWER - Deep water that
submerges the camera
- Fogging of optical lens
- Offset joints
Centrifugal pump parts include...
Diaphragm?
Piston?
Rotor?
Volute? - ANSWER Volute
When packing a centrifugal pump, how should the packing gland be tightened? - ANSWER Slowly, over a
period of several hours
What factors should be considered when providing trench shoring? - ANSWER Structures or sources of
vibration near trenches
