4A Unit 5 Exam 2025 Questions and
Answers
Where does the oxygen in the air come from?
Select one:
a. plants
b. minerals
c. the oceans
d. animals - CORRECT ANSWER✔️✔️-a. plants
If noise can't be reduced to safe levels by getting a quieter machine or by using sound absorbing
materials around it, what can be done?
Select one:
a. Move the equipment so that the noise isn't a concern
b. Use hearing protection
c. Re-engineer the equipment
d. Restrict access to the machine - CORRECT ANSWER✔️✔️-b. Use hearing protection
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,If a hazardous liquid were to escape containment (it has spilled) who must report the spill?
Select one:
a. the plant chief
b. the person in charge of the material
c. the person who discovers the spill
d. the plant manager - CORRECT ANSWER✔️✔️-b. the person in charge of the material
What do animals use to change what they eat (biomass) into energy?
Select one:
a. water
b. photosynthesis
c. oxygen
d. heat from the sun - CORRECT ANSWER✔️✔️-c. oxygen
Carbon can find its way into rock via:
Select one:
a. groundwater
b. the formation of sedimentary rocks
c. decaying plant matter
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,d. carbon dioxide carrying precipitation - CORRECT ANSWER✔️✔️-b. the formation of
sedimentary rocks
If it is feasible to eliminate the root cause of a problem, what type of action is taken?
Select one:
a. permanent action
b. final action
c. restorative action
d. fixative action - CORRECT ANSWER✔️✔️-a. permanent action
(4-042-2.2) In an electrostatic precipitator the:
Select one:
a. Particles receive a positive charge
b. Collector plates and electrodes are both positively charged
c. Discharge electrode is negatively charged
d. Ash falls unaided into the bottom hopper - CORRECT ANSWER✔️✔️-c. Discharge electrode
is negatively charged
With regards to solid pollutants, what is a surface impoundment?
Select one:
a. It is part of the conveying system meant to handle solid pollutants
b. It is an area to store dry solid pollutants
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, c. It is a pond or lagoon where solid pollutants are stored
d. It is a warehouse where solid pollutants are stored - CORRECT ANSWER✔️✔️-c. It is a pond
or lagoon where solid pollutants are stored
How can a Power Engineer affect the environmental impact his/her facility has?
Select one:
a. by having a good attitude towards environmental impacts
b. by ensuring all equipment is running as it should
c. by following procedures to the letter
d. by reporting all spills immediately - CORRECT ANSWER✔️✔️-a. by having a good attitude
towards environmental impacts
(4-041-2.1) One proven method of reducing the sulphur oxides in flue gas is to:
Select one:
a. Use staged combustion
b. Reduce the amount of excess air
c. Scrub the flue gas with lime or limestone
d. Lower the furnace temperature - CORRECT ANSWER✔️✔️-c. Scrub the flue gas with lime or
limestone
What is "respiration"?
Select one:
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Answers
Where does the oxygen in the air come from?
Select one:
a. plants
b. minerals
c. the oceans
d. animals - CORRECT ANSWER✔️✔️-a. plants
If noise can't be reduced to safe levels by getting a quieter machine or by using sound absorbing
materials around it, what can be done?
Select one:
a. Move the equipment so that the noise isn't a concern
b. Use hearing protection
c. Re-engineer the equipment
d. Restrict access to the machine - CORRECT ANSWER✔️✔️-b. Use hearing protection
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,If a hazardous liquid were to escape containment (it has spilled) who must report the spill?
Select one:
a. the plant chief
b. the person in charge of the material
c. the person who discovers the spill
d. the plant manager - CORRECT ANSWER✔️✔️-b. the person in charge of the material
What do animals use to change what they eat (biomass) into energy?
Select one:
a. water
b. photosynthesis
c. oxygen
d. heat from the sun - CORRECT ANSWER✔️✔️-c. oxygen
Carbon can find its way into rock via:
Select one:
a. groundwater
b. the formation of sedimentary rocks
c. decaying plant matter
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
,d. carbon dioxide carrying precipitation - CORRECT ANSWER✔️✔️-b. the formation of
sedimentary rocks
If it is feasible to eliminate the root cause of a problem, what type of action is taken?
Select one:
a. permanent action
b. final action
c. restorative action
d. fixative action - CORRECT ANSWER✔️✔️-a. permanent action
(4-042-2.2) In an electrostatic precipitator the:
Select one:
a. Particles receive a positive charge
b. Collector plates and electrodes are both positively charged
c. Discharge electrode is negatively charged
d. Ash falls unaided into the bottom hopper - CORRECT ANSWER✔️✔️-c. Discharge electrode
is negatively charged
With regards to solid pollutants, what is a surface impoundment?
Select one:
a. It is part of the conveying system meant to handle solid pollutants
b. It is an area to store dry solid pollutants
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
, c. It is a pond or lagoon where solid pollutants are stored
d. It is a warehouse where solid pollutants are stored - CORRECT ANSWER✔️✔️-c. It is a pond
or lagoon where solid pollutants are stored
How can a Power Engineer affect the environmental impact his/her facility has?
Select one:
a. by having a good attitude towards environmental impacts
b. by ensuring all equipment is running as it should
c. by following procedures to the letter
d. by reporting all spills immediately - CORRECT ANSWER✔️✔️-a. by having a good attitude
towards environmental impacts
(4-041-2.1) One proven method of reducing the sulphur oxides in flue gas is to:
Select one:
a. Use staged combustion
b. Reduce the amount of excess air
c. Scrub the flue gas with lime or limestone
d. Lower the furnace temperature - CORRECT ANSWER✔️✔️-c. Scrub the flue gas with lime or
limestone
What is "respiration"?
Select one:
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