Water Operator Certification Exam Prep Laboratory Analysis - I. Water treatment Introductory Questions.
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38 Terms
1) What test is done by a laboratory to determine data quality?
Spiked samples to test
3 multiple choice options
2) A beaker is primarily used for ___________.
mixing chemicals
3 multiple choice options
3) The Curie unit is the activity of 1g of ______ or ______ disintegrations per second.
radium , 3.7 X 10^10
3 multiple choice options
4) What is the primary constituent of the pH -causing ions in a water sample if the pH is above 10?
OH-
3 multiple choice options
5) Coliform bacteria will produce gas in ______broth at ______within ______.
lactose or lauryl tryptose , 35.5ÂşC , 24-48 Hours
3 multiple choice options
6) The number of samples under the Total Coliform Rule that a water system must collect depends on the _______.
number of customers it serves
3 multiple choice options
7) Phenolphthalein acidity is the same as ____________
CO2
3 multiple choice options
8) Drinking water samples to be tested for total coliforms should be tested the same day they are collected, but they can be refrigerated for_________ before analysis.
8 hours
3 multiple choice options
9) What type of laboratory equipment is highly resistant to heat , sudden temperature change and chemical attack?
Porcelain dishes
3 multiple choice options
10) Two metals that are typically toxic are _______ , and two metals that are not normally toxic are _______.
Chromium and cadmium , manganese and iron
3 multiple choice options
11) The total hardness and total alkalinity of water are used to calculate the _______.
carbonate and noncarbonate hardness
3 multiple choice options
12) What group of organism are measured that , if present , might indicate the presence of pathogens ?
Coliform bacteria
3 multiple choice options
13) Alkalinity is defined as ________.
a measurement of the water's capacity to neutralize an acid.
3 multiple choice options
14) What should be done with the lid while collecting a bacteriological sample ?
Hold the cap, threads down, while collecting the sample with the other hand.
3 multiple choice options
15) The zeta potential is defined as a force that will keep ______ apart and keep them suspended.
very small colloidal particles
3 multiple choice options
16) specific UV absorbance (SUVA) is an indicator of what disinfection by-product precursor substances?
Humic Content
3 multiple choice options
17) Sampling of organic compounds must be done with ultraclean glass vials that have lids made of _____________.
polytetrafluoroethylene
3 multiple choice options
18) The best place to collect samples at water treatment plants would most probably be _________.
from the main stream flow.
3 multiple choice options
19) What are the chemical formula precipitates when chlorine is added to water containing iron and manganese? = ÂżCuáles son los precipitados de fĂłrmula quĂmica cuando se agrega cloro al agua que contiene hierro y manganeso?
Fe(OH)3 (Iron(III) oxide-hydroxide) and MnO2. (Manganese dioxide).
3 multiple choice options
20) What is calcium hardness , as CaCO3, if the water has a calcium content of 51 mg/L? . Use the following equivalent weights table to answer this question.
127.36 mg/L Ca as Ca CO3
3 multiple choice options
21) The saturation point of a chemical in water varies with _________.
pH , total dissolved solids(TDS) , temperature
3 multiple choice options
22) Why is it important to label that contents of all containers that carry materials or solutions in a water plant?
All of the above ( To prevent mixing of incompatible materials, To prevent unwanted reactions affecting health and safety, To prevent losing a sample).
3 multiple choice options
23) The amount of oxygen that can remain dissolved in water is a function of the water's ________, and the________the water, the _______the possible concentration of dissolved oxygen.
Temperature, colder , higher
3 multiple choice options
24) The precise location of sampling points depends on the ________ the distribution system.
configuration of
3 multiple choice options
25) Which is the most inexpensive pathogenic test?
Coliforms
3 multiple choice options
26) In order to test a laboratory and an analyst, the oversight agency gives the laboratory and analyst a _________test. =. Para probar un laboratorio y un analista, la agencia de supervisiĂłn le da al laboratorio y al analista_____________ probar
set of blind standard to = conjunto de estándares ciegos para
3 multiple choice options
27) A virus would be considered a ______.
Both b and c ( colloidal solid and biological solid)
3 multiple choice options
28) Customer complaints of ______ are often caused by a ________.
Taste, odor, and color ; water softener or water heater.
3 multiple choice options
29) What are the additives in detergent that tie up hardness ions ?
Sequestering agents
3 multiple choice options
30) what rule requires the measurement of conductivity ?
Lead and Copper Rule
3 multiple choice options
31) Any good _______ household detergent is adequate for cleaning labware , and it is preferred that the detergent be of a _______ Type.
nonphosphate, liquid
3 multiple choice options
32) Raw water temperature should be measured at a minimum of ________.
Every 24 hours.
3 multiple choice options
33) Find the amount of Iron(Fe) removed per year from a plant that treats an average of 17.2 MGD , if the average raw water iron concentration is 0.46 mg/L and the removal efficiency is 82%. Round to the most appropriate answer.
20,000 lb/yr of Fe removed
3 multiple choice options
34) If a treatment plant softens its water, where should samples be collected to determine whether the desired degree of softening has been achieved ?
Immediately after softening and before the clearwell
3 multiple choice options
35) As this parameter increases , corrosion decreases.
Alkalinity
3 multiple choice options
36) What threshold odor number(TON) , also the USEPA secondary MCL, will begin to draw complaints from customers?
3 TON
3 multiple choice options
37) The turbidity reading from a meter at a water plant's Clearwell is reading a zero immediately to the right of the decimal point, and the next three numbers to the right of the zero are 435. What should the operator record if three numbers to the right of the zero are 435. What should the operator record if three digits to the right of the decimal are needed?
0.044
3 multiple choice options
38) Samples should not be collected from _____or _______.
Sill cocks ,faucets with hose threads= Llaves de paso , grifos con roscas de manguera.
3 multiple choice options
Note 
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