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Book 1 Ch 7 - Corrosion Control Practice Quiz

front 1

Calculate the Langelier Index from the results of water testing shown below:
Initial pH = 7.9
pH after saturation = 8.3

back 1

-0.4

front 2

In the corrosion cell, or a piece of iron pipe, this is the positive pole, or electrode

back 2

The anode

front 3

The absence of dissolved oxygen and low pH make ideal conditions for what?

back 3

The growth of anaerobic bacteria

front 4

By rule, samples for lead and copper must be 'first-draw' samples. What defines a 'first-draw' sample?

back 4

A sample that is the first liter of water collected from a tap that has not been used for at least 6 hours

front 5

From the list of lead sample results shown, calculate the 90th percentile lead
result.
0.003 mg/L
0.004 mg/L
0.020 mg/L
0.023 mg/L
0.045 mg/L
0.076 mg/L
0.003 mg/L
0.090 mg/L
0.002 mg/L
0.002 mg/L

back 5

0.076 mg/L

front 6

The results of the Marble Test are as follows:

•Initial water pH = 7.8

Finished water pH = 7.5

•Initial water hardness = 156 mg/L as CaCO3

Finished water hardness = 143 mg/L as CaCO3

•Initial water alkalinity = 198 mg/L as CaCO3

Finished water alkalinity = 172 mg/L as CaCO3

What do these test results indicate?

back 6

The initial water is saturated

front 7

In a piece of iron pipe that is experiencing tuberculation, a pit in the pipe wall and subsequent tubercule forms at which location?

back 7

At the anode

front 8

What analysis uses a pinch of powdered calcium carbonate along with results of hardness, alkalinity and pH tests?

back 8

Marble test

front 9

If the result of the Langelier Index test of water in a distribution system is positive, which of the following statements is correct?

back 9

The water in the distribution system is scale forming

front 10

According to the lead and copper rule, samples must be collected at locations the utility has identified as high risk. These locations include homes with lead pipes, lead service lines and what other factor?

back 10

Homes with lead solder installed after 1982

front 11

Water that contains dissolved salts is known as what?

back 11

Electrolyte

front 12

This element is considered the most corrosive component of water chemistry

back 12

Oxygen

front 13

Phosphate based corrosion inhibitors may cause what condition?

back 13

Encourage growth of biofilms on pipe walls

front 14

The plant operator is receiving complaints from customers in a section of the service area about red colored water, metallic taste and low water pressure. The area is also prone to water leaks and water main breaks. What is happening in the water system?

back 14

Corrosion of the metal water mains is occurring