MultipleChoicePractice-1

Question 1

Temporary trickling filter odor control can be obtained by :

a. Use of insecticide
B Using Masking agent
c. Draining the filter
d. pH adjustment
E. Using hydrogen sulfide

Answer 1

B. Using a masking agent

Question 2

A roughing filter can be used to

a. increase wastewater DO before trickling filter application
b. Remove wastewater solids before gravity filter application
c. Reduce high BOD wastewater before trickling filter application
d. Disinfect wastewater
e. Reduce the pH

Answer 2

C. Reduce high BOD wastewater before trickling filter application

Question 3

Nitrification is the conversion of

a. Ammonia-nitrogen to nitrite and then nitrate
b. Nitrate to nitrogen gas
c. None of the above
d. Ammonia-nitrogen to nitrogen gas
e. ammonia to amine

Answer 3

A. Ammonia -Nitrogen to nitrite and then nitrate

Question 4

When igh sloughing occurs on a RBC, the oprator should

a. All are correct
b. Check the pH
c. Check the influent flow rate and determine if it is high
d. Check the influent for toxic substances
e. Check the influent organic load and determine if it is high

Answer 4

A. All are correct

Question 5

Denitrification is

a. Conversion of nitrate to nitrite to nitrogen gas products
conversion of nitrogen to nitrate
c. conversion of nitrogen to amine
d. Conversion of ammonia to amine
e. Conversion of nitrate to amine

Answer 5

A. Conversion of nitrate to nitrite to nitrogen gas products

Question 6

Important measurements for rotating biological contractor operations are

a. All are correct
b. BOD
c. DO
d. COD
e. pH

Answer 6

A. All are correct

Question 7

Aerobic sludge digestion normally takes about

a. a. 7 days
b. All are correct
c. 20 days
d. 30 days
e. 90 days

Answer 7

D. 30 days

Question 8

Starting up and shutting down an activated sludge treatment plant

a. Is an easy operation
b. Is the same from one plant to another
c. Is to o difficult for even an Operator, only engineers start and shut down plants
d. Should be accomplished in one shift
e. Should follow a written plan

Answer 8

E. Should follow a written plan

Question 9

Ammonia-nitrogen in the effluent of treatment plants may cause

a. Potential health hazards to newborn infants
b. Ammonia toxicity to fish in receiving waters
c. Increased MPN
D. Increased dissolved oxygen depletion in receiving waters
e. All are correct

Answer 9

E. all are correct

Question 10

An anaerobic process is one

a. Containing low BOD
b. None of the above
c. Containing no dissolved oxygen
d. May or may not contain dissolved oxygen
e. Containing dissolved oxygen

Answer 10

C. Containing no dissolved oxygen

Question 11

Microorganisms found in the MLSS include

a. Free crawling ciliates
b. Flagellates
c. All are correct
d. Stalked ciliates
e. Amoeboid

Answer 11

C. All are correct

Question 12

reC. Food wastes
D. Rubber
E. Inert materials

Answer 12

C. Food wastes

Question 13

Worms and rotifers are examples of

a. Animals in the MLSS
b. Viruses in the MLSS
c. MO in the MLSS
d. Algae in the MLSS
e. Bacteria in the MLSS

Answer 13

A. Animals in the MLSS

Question 14

It is always important when using chlorine

a. To remember less is better
b. To remember pathogens will not be affected
c. To remember more is better
d. To apply to correct amount. An under dose or an over dose can lead to serious problems
e. To remember that the dose does not affect what microorganisms are in the wastewater

Answer 14

D. To apply the correct amount. An under dose or an over dose can lead to serious problems.

Question 15

WAS stands for

a. Has no significance
b. None are correct
c. Work always safely
d. Waste activated sludge
e. Wait after supper

Answer 15

D. Waste activated sludge

Question 16

One safety rule when working around chlorine gas is

a. Make sure work can be completed before break time
b. Make sure a self contained breathing apparatus is located in the chlorine room for emergency action
c. No special safety rules are required when working with chlorine gas. It is not toxic to humans, only to MO
d. Make sure operators can hold their breath for at least 60 seconds
e. Make sure a self contained breathing apparatus is located outside the chlorine room for emergency action

Answer 16

E. Make sure a self contained breathing apparatus is located outside the chlorine room for emergency action

Question 17

Sodium nitrate can be used to

a. Cause coagulation
b. Provide oxygen for facultative organisms
c. Provide a source for disinfection
d. Disinfect sludge
e. Sweeten a sour anaerobic digester

Answer 17

B. Provide oxygen for facultative organisms

Question 18

The major advantage(s) of water hyacinth system is

a. It does not require much land space
b. the production of hemp
c. There are no safety hazards to the operator
d. Hemp can be grown and sold as a side product
e. It’s a natural process requiring little energy input

Answer 18

E. It’s a natural process requiring little energy input

Question 19

DO in a pond will increase

a. With high BOD loading
b. During the night
c. During the day
d. with increased temperature
e. All are correct

Answer 19

C. During the day

Question 20

Careful chlorination of the RAS will

a. All are correct
b. Inactive filamentous causing bulking
c. Lower the BOD
d. Increase denitrification
e. Increase the pH

Answer 20

B. Inactive filamentous causing bulking