Name: Score:
75 Multiple choice questions
Definition 1 of 75
Water laboratory test calculations and results use which system?
Metric
Quadratic
Standard
Metronome
Definition 2 of 75
A mixture of air and gas is considered hazardous when the mixture exceeds what percentage of
the lower explosive limit (LEL)?
50%
5%
20%
10%
Definition 3 of 75
When bringing community water service to a home with a private well, what is the most positive
method of preventing a cross connection between the two systems?
Connecting both systems directly with no barriers
Using a single check valve to separate the systems
Installing a filter to clean the water between systems
Complete isolation between the two systems using an air gap
,Definition 4 of 75
Convert 60.5 degrees Fahrenheit to degrees Celsius.
25.0 degrees Celsius
15.8 degrees Celsius
10.0 degrees Celsius
20.5 degrees Celsius
Definition 5 of 75
How many coliform samples are required per month for a water system serving a population
between 25 and 100?
Electricity
1
Preserved
10
Definition 6 of 75
What device measures the flow rate of gases?
Rotameter
Orificemeter
Venturimeter
Flow Meter
, Definition 7 of 75
What agent is responsible for for reporting lab results to the regulatory agency?
Bacteria
Water system owner
State
Laboratory
Definition 8 of 75
What are the most important methods of ensuring operator safety?
Relying solely on personal experience.
Installing new equipment without supervision.
Providing handbooks and copies of regulations
Alerting operators of unsafe acts and conducting mandatory safety training
Definition 9 of 75
Chlorine demand is satisfied at the point when
the chlorine concentration exceeds 100 mg/l.
the water reaches a temperature of 100 degrees celsius.
the chlorine evaporates completely from the water.
the reaction of chlorine with organic materials stops.
75 Multiple choice questions
Definition 1 of 75
Water laboratory test calculations and results use which system?
Metric
Quadratic
Standard
Metronome
Definition 2 of 75
A mixture of air and gas is considered hazardous when the mixture exceeds what percentage of
the lower explosive limit (LEL)?
50%
5%
20%
10%
Definition 3 of 75
When bringing community water service to a home with a private well, what is the most positive
method of preventing a cross connection between the two systems?
Connecting both systems directly with no barriers
Using a single check valve to separate the systems
Installing a filter to clean the water between systems
Complete isolation between the two systems using an air gap
,Definition 4 of 75
Convert 60.5 degrees Fahrenheit to degrees Celsius.
25.0 degrees Celsius
15.8 degrees Celsius
10.0 degrees Celsius
20.5 degrees Celsius
Definition 5 of 75
How many coliform samples are required per month for a water system serving a population
between 25 and 100?
Electricity
1
Preserved
10
Definition 6 of 75
What device measures the flow rate of gases?
Rotameter
Orificemeter
Venturimeter
Flow Meter
, Definition 7 of 75
What agent is responsible for for reporting lab results to the regulatory agency?
Bacteria
Water system owner
State
Laboratory
Definition 8 of 75
What are the most important methods of ensuring operator safety?
Relying solely on personal experience.
Installing new equipment without supervision.
Providing handbooks and copies of regulations
Alerting operators of unsafe acts and conducting mandatory safety training
Definition 9 of 75
Chlorine demand is satisfied at the point when
the chlorine concentration exceeds 100 mg/l.
the water reaches a temperature of 100 degrees celsius.
the chlorine evaporates completely from the water.
the reaction of chlorine with organic materials stops.
