4A Unit 5 Exam 2025 Questions and Answers

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


If a hazardous liquid were to escape containment (it has spilled) who must report the spill?



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,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


d. carbon dioxide carrying precipitation - CORRECT ANSWER✔️✔️-b. the formation of

sedimentary rocks




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,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

c. It is a pond or lagoon where solid pollutants are stored




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, 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:

a. the process where plants take in carbon dioxide



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