Wastewater /
Class
/ //
2 /
multiple
/ /
choice exam questions with correct answers
/ // // // // //
The //threahold //limit //value //concentration //for //chlorine //vapour //is:
a. //0.1 //ppm
b. //0.3 //ppm
c. //0.5 //ppm
d. //1.0 //ppm //- //correct //answer(s) //✔✔ //c. //0.5ppm
When /
/working /
/in //confined //spaces //where //flammable //gasesmay //be //present, //use //only //tools //made //of:
a. //stainless //steel
b. //lead
c. //iron
d. //a //non-sparking //alloy //- //correct //answer(s) //✔✔ //d. //a //non-sparking //alloy
In /
/addition /
/to /
/the /
/worker /
/entering //
,a/
/confined /
/space, /
/what /
/is /
/thw /
/minimum //number //of //people //required //to //be //present //during //a //confined //space //entry?
a. //1
b. //2
c. //3
d. //4 //- //correct //answer(s) //✔✔ //a. //1
Hearing /
/protection //must //be //made //available //to //all //employees //exposed //to //noise //levels //above:
a. //85 //db //averaged //over //8 //working //hours
b. //850 //db //averaged //over //8 //working //hours
c. //85 //db //continuously //for //8 //working //hours
d. /
/85 /
/db /
/at /
/any /
/point /
/in /
/the //8 //hour //workday //- //correct //answer(s) //✔✔ //a. //85 //db //averaged //over //8 //working //hours
Recommended /
/hygiene /
/practices //to //minimize //the //risk //if //being //infected //by //wastewater //pathogens //include:
a. //only //rubbing //your //eyes //while //working //if //you //are //wearing //impervious //gloves
b. //washing //your //hands //before //the //beginning //of //your //shift
,c. //changing //out //your //work //clothes //and //showering //before //leaving //work
d. /
/reading /
/the /
/material /
/safety /
/data /
/sheets /
/for /
/all /
/chemicals /
/used /
/in /
/the /
/plant //- /
/correct /
/answer(s) //✔✔ //c. //changing //out //your //work //clothes //and //showering //before //leaving //work
the /
/BOD /
/loading /
/rate /
/divided /
/by /
/the /
/quantity /
/of //microorganisms //present //in //the //biological //reactor //(aeration //tanks) //is //known //as:
a. //organic //loading
b. //toxicity
c. //hydraulic //loading
d. //food //to //microorganism //ratio //- //correct //answer(s) //✔✔ //d. //food //to //microorganism //ratio
The /
/food /
, /to /
/microorganism /
/ratio /
/is /
/the /
/ratio /
/of /
/the //mass //of //organic //loading //to //the //mass //of //microorganisms //in //the //biological //reactors
white /
/fluffy /
/foam //on //the //biological //reactors //in //an //activated //sludge //process //is //usually //caused //by:
a. //insufficient //biomass //to //treat //the //incoming //waste //
B. //Low //b //o //d //
C. //high //do //
D. /
/Too /
/little /
/sludge /
/being /
/waste /
/from /
/process //- //correct //answer(s) //✔✔ //a. //insufficient //biomass //to //treat //the //incoming //waste //
Stiff /
/white /
/foam /
/typically /
/indicates /
/that //there //are //too //few //microorganisms //in //the //system //to //treat //the //incoming //waste. //This
//shortage //can //be //caused //by //start-
up /
/conditions, /
/excessive /
/wasting, /
/toxic /
Class
/ //
2 /
multiple
/ /
choice exam questions with correct answers
/ // // // // //
The //threahold //limit //value //concentration //for //chlorine //vapour //is:
a. //0.1 //ppm
b. //0.3 //ppm
c. //0.5 //ppm
d. //1.0 //ppm //- //correct //answer(s) //✔✔ //c. //0.5ppm
When /
/working /
/in //confined //spaces //where //flammable //gasesmay //be //present, //use //only //tools //made //of:
a. //stainless //steel
b. //lead
c. //iron
d. //a //non-sparking //alloy //- //correct //answer(s) //✔✔ //d. //a //non-sparking //alloy
In /
/addition /
/to /
/the /
/worker /
/entering //
,a/
/confined /
/space, /
/what /
/is /
/thw /
/minimum //number //of //people //required //to //be //present //during //a //confined //space //entry?
a. //1
b. //2
c. //3
d. //4 //- //correct //answer(s) //✔✔ //a. //1
Hearing /
/protection //must //be //made //available //to //all //employees //exposed //to //noise //levels //above:
a. //85 //db //averaged //over //8 //working //hours
b. //850 //db //averaged //over //8 //working //hours
c. //85 //db //continuously //for //8 //working //hours
d. /
/85 /
/db /
/at /
/any /
/point /
/in /
/the //8 //hour //workday //- //correct //answer(s) //✔✔ //a. //85 //db //averaged //over //8 //working //hours
Recommended /
/hygiene /
/practices //to //minimize //the //risk //if //being //infected //by //wastewater //pathogens //include:
a. //only //rubbing //your //eyes //while //working //if //you //are //wearing //impervious //gloves
b. //washing //your //hands //before //the //beginning //of //your //shift
,c. //changing //out //your //work //clothes //and //showering //before //leaving //work
d. /
/reading /
/the /
/material /
/safety /
/data /
/sheets /
/for /
/all /
/chemicals /
/used /
/in /
/the /
/plant //- /
/correct /
/answer(s) //✔✔ //c. //changing //out //your //work //clothes //and //showering //before //leaving //work
the /
/BOD /
/loading /
/rate /
/divided /
/by /
/the /
/quantity /
/of //microorganisms //present //in //the //biological //reactor //(aeration //tanks) //is //known //as:
a. //organic //loading
b. //toxicity
c. //hydraulic //loading
d. //food //to //microorganism //ratio //- //correct //answer(s) //✔✔ //d. //food //to //microorganism //ratio
The /
/food /
, /to /
/microorganism /
/ratio /
/is /
/the /
/ratio /
/of /
/the //mass //of //organic //loading //to //the //mass //of //microorganisms //in //the //biological //reactors
white /
/fluffy /
/foam //on //the //biological //reactors //in //an //activated //sludge //process //is //usually //caused //by:
a. //insufficient //biomass //to //treat //the //incoming //waste //
B. //Low //b //o //d //
C. //high //do //
D. /
/Too /
/little /
/sludge /
/being /
/waste /
/from /
/process //- //correct //answer(s) //✔✔ //a. //insufficient //biomass //to //treat //the //incoming //waste //
Stiff /
/white /
/foam /
/typically /
/indicates /
/that //there //are //too //few //microorganisms //in //the //system //to //treat //the //incoming //waste. //This
//shortage //can //be //caused //by //start-
up /
/conditions, /
/excessive /
/wasting, /
/toxic /
