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B Exam: Instrumentation and Laboratory

front 1

An instrument's ability to establish the actual value of a process variable being measured is called?

back 1

Accuracy

front 2

The ability of an instrument to repeatedly obtain the same outcome is called?

back 2

Precision

front 3

What does a totalizer (integrator) measure?

back 3

The cumulative/total flow or process variable

front 4

Velocity sensing devices measure rate of flow by sensing?

back 4

Rate of Rotation

front 5

What does a flow meter measure?

back 5

Rate of Flow at a given time

front 6

What meter is widely used in water treatment because of its accuracy?

back 6

Venturi Meter

front 7

How does a Venturi meter measure flow rate?

back 7

Differential pressure

front 8

A device used to measure the flow rate of gases and liquids is?

back 8

Rotameter

front 9

What is the most accurate method to feed chemicals?

back 9

Electronically Controlled Feeders

front 10

What indicates that the silica gel in a desiccator is spent?

back 10

Changes color to pink

front 11

The readout of an instrument by a pointer is called?

back 11

Analog

front 12

What do you call a device that controls starting, stopping, or operation of a piece of equipment?

back 12

Controller

front 13

The readout of an instrument by a direct, numerical reading of the measured value is called?

back 13

Digital reading

front 14

What is the most common type of level controller found in water systems?

back 14

Ball Floats

front 15

What is computer hardware?

back 15

The computer devices that run the computer

front 16

What is software?

back 16

Computer programs installed on computer hardware

front 17

A meter should never be installed directly in front of a pump because?

back 17

Turbulence will cause inaccurate readings

front 18

Remote monitoring of plant and distribution processes is called?

back 18

SCADA (Supervisory Control and Data Acquisition)

front 19

What do the letters TD mean on a graduated cylinder?

back 19

To Deliver

front 20

What do the letters TC mean on a graduated cylinder?

back 20

To Contain

front 21

What is the most accurate lab equipment to deliver a 100 mL sample?

back 21

front 22

Dissolved oxygen (DO) is measured by a portable dissolved oxygen meter or chemically by the _______ method?

back 22

Winkler Method

front 23

Flow meters in a water plant must be calibrated how frequently?

back 23

Once every 2 years

front 24

A sample being analyzed for pH must be first measured for?

back 24

Temperature

front 25

How often should a pH meter be calibrated?

back 25

At least once a day

front 26

What drying oven temperature is used to determine TDS?

back 26

180°C

front 27

What is a buret used for?

back 27

Ans. Titration
Ans. Accurately deliver a sample

front 28

What temperature is used in a muffle furnace to determine volatile solids?

back 28

550 C

front 29

What is a meniscus?

back 29

The curved (bevel) surface of a column of liquid in a small tube or cylinder

front 30

How do you read the meniscus?

back 30

Ans. For water, the bottom of the curve/bevel
Ans. For mercury, the top of the curve/bevel

front 31

Never add _____ to acid

back 31

Water

front 32

What is the oven temperature used for drying suspended solids?

back 32

103-105°C

front 33

A representative portion of a sample is called?

back 33

Aliquot

front 34

What is the holding time for Coliform samples?

back 34

6 hours (test must be completed within 30 hours of sampling)

front 35

What is the holding time for Turbidity samples?

back 35

48 hours

front 36

What is the holding time for THM samples?

back 36

14 days

front 37

What is the holding time for iron samples?

back 37

Ans. 48 hours if not acidified
Ans. 6 months if acidified

front 38

What is the best method to analyze iron samples?

back 38

Ans. Atomic Absorption

front 39

What preservative is added to iron samples?

back 39

Nitric Acid

front 40

What is the simplest test to determine if water is hard^?

back 40

Soap

front 41

What does it indicate if all the samples in a MPN test have gas?

back 41

Test is invalid

front 42

What broth is used in the membrane Filtration coliform Test?

back 42

M-Endo broth

front 43

How long do coliform tests run?

back 43

24 hours

front 44

What broth is used for the fecal coliform test?

back 44

E-coli broth

front 45

What is the incubation period and temperature for the fecal coliform test?

back 45

24 hours plus or minus 2 hours; 44.5°C

front 46

What analysis uses green bile broth?

back 46

Confirmed MPN test

front 47

What analysis uses lauryl triptose or lactose as a medium?

back 47

Presumptive MPN test

front 48

What is the incubation period and temperature for the total coliform test?

back 48

24 hours plus or minus 2 hours; 35°C

front 49

What test uses a petri dish?

back 49

Membrane Filtration Coliform test

front 50

What is the minimum amount of sample needed for a coliform test?

back 50

100 mL

front 51

Which test measures both fecal and tol coliform at the same tiem?

back 51

Colilert test

front 52

The Presence or Absence Test measures which parameter?

back 52

Total Coliform

front 53

What is the holding time for Color?

back 53

48 hours

front 54

What is the holding time for pH and/or Chlorine?

back 54

Immediately

front 55

What is the holding time for odor testing?

back 55

6 hours

front 56

What is the holding time for Dissolved Oxygen (DO) testing?

back 56

Immediately

front 57

What instrument measures the disinfectant potential or effectiveness of chlorine?

back 57

ORP Probe

front 58

The greatest errors in laboratory analysis are caused by?

back 58

Improper sampling and poor mixing

front 59

For laboratory analysis to have any significance, the sample must be?

back 59

Representative

front 60

What analysis uses DPD as a reagent?

back 60

Chlorine Residual

front 61

Chemicals symbols are used as short hand for the names of?

back 61

Elements

front 62

A substance composed of two or more different elements and whose composition is constant is called?

back 62

Compound sample.

front 63

To reduce or eliminate errors in test results that can be caused when the dilution water used in the analysis is contaminated, the laboratory uses a _______ sample

back 63

Blank

front 64

The most accurate method for measuring chlorine residual is the?

back 64

Amperometric Test

front 65

What is the action level for lead?

back 65

0.015 mg/L

front 66

What is the action level for copper?

back 66

1.3 mg/L

front 67

How often must a water system split fluoride samples with HRS Dental Office?

back 67

Once a month

front 68

What is the SMCL for sulfate?

back 68

250 mg/L

front 69

Sulfates in water are a concern because?

back 69

Ans. They have a laxative effect
Ans. Cause scaling

front 70

What is the SMCL for chlorides?

back 70

250 mg/L

front 71

A WTP must keep bacteriological records for how long?

back 71

5 years

front 72

For how long must a WTP keep MORS?

back 72

10 years

front 73

What is a tier 1 violation?

back 73

Exceeds MCL for health Hazard; Requires customer notification

front 74

The MOR must be mailed (Electronic or sanil mail) by what date?

back 74

10 days following the end of the operating month

front 75

The MOR must be sent where?

back 75

County HRS Office

front 76

Which Primary Standards are IDLH?

back 76

Nitrites and Bacteria

front 77

What is the minimum PSI allowed in the distribution system?

back 77

20 PSI

front 78

If a water system pressure goes below 20 psi, what actiuon is needed?

back 78

Boil water notice

front 79

What is the SMCL for color?

back 79

15 Color Units

front 80

What is the SMCL for TDS?

back 80

500 mg/L

front 81

Specific conductance is indirect measure of what parameter?

back 81

TDS

front 82

The TDS represents what percentage of the specific conductance reading?

back 82

About 70%

front 83

Which samples are taken in the home of a customer?

back 83

Lead and Copper

front 84

Lead in drinking water can cause what health hazard?

back 84

Brain Damage

front 85

Copper in drinking water causes what health problem?

back 85

Wilson's disease

front 86

Lead and copper samples are called?

back 86

First draw samples (Taken at kitchen bathroom tap after nonuse for at least 6 hours)

front 87

What does it indicate if the 90 percentile lead or copper analysis exceeds the action level?

back 87

Water system is in violation and must take remedial action

front 88

How often are lead and copper samples taken?

back 88

Every six months

front 89

What steps may be taken if a water system violates action level for lead and copper?

back 89

Ans. PH adjustment
Ans. Public notice and education
Ans. Addition of polyphosphate prior to filtration