UMC Operations and Maintenance 3

Question 1

When performing confined space entry in a utility vault, what must be done FIRST?

Accepted Answer

Test the atmosphere for oxygen, flammable gases, and toxic vapors

Answer

Enter quickly to minimize exposure time

Answer

Turn off all lighting to conserve power

Answer

Remove all PPE to allow freer movement

Question 2

What is the purpose of flushing water distribution mains?

Accepted Answer

Remove sediment, biofilm, and stale water to maintain water quality

Answer

Increase system pressure

Answer

Test for leaks in pipe joints

Answer

Calibrate flow meters

Question 3

Which type of pump is most commonly used to move wastewater in lift stations?

Accepted Answer

Centrifugal pump

Answer

Reciprocating piston pump

Answer

Peristaltic pump

Answer

Diaphragm pump

Question 4

What does BOD stand for in wastewater treatment?

Accepted Answer

Biological Oxygen Demand

Answer

Basic Oxygen Demand

Answer

Bacterial Output Density

Answer

Baseline Organic Distribution

Question 5

A utility is experiencing frequent main breaks in a specific zone. Which approach BEST addresses the root cause?

Accepted Answer

Conduct pipe condition assessment and prioritize rehabilitation

Answer

Increase pressure throughout the system

Answer

Add more chlorine to prevent corrosion

Answer

Hire more repair crews

Question 6

What is the primary hazard associated with hydrogen sulfide (H₂S) in sewer systems?

Accepted Answer

It is highly toxic and can cause rapid incapacitation at low concentrations

Answer

It causes pipe corrosion only

Answer

It increases wastewater pH

Answer

It accelerates biological treatment

Question 7

Which document outlines the step-by-step procedures for safely isolating equipment for maintenance?

Accepted Answer

Lockout/Tagout (LOTO) procedure

Answer

Capital Improvement Plan

Answer

Consumer Confidence Report

Answer

Asset Management Plan