# Exam Review

True or false: Hydrogen sulfide is a major component of digester gas. Over five days the DO concentration in the BOD blank can change by no more than how many mg/L? A very simple equation is used to calculate water power. What is it? When calculating motor power, water power is divided by what and […]

What are the lower and upper explosion limits of methane mixed with air? If CO2, carbon dioxide, is not flammable, not explosive, not toxic, how can it kill you? Two reasons were given in class for drawing a picture for each math problem. What are they? If the density of a ferric chloride solution is […]

Simply stated, what are the three steps in writing an essay? What is the conversion factor used by WWTT to get from gal to Mgal and Mgal to gal? What is the typical composition of digester gas? In the BOD test there are two criteria that must be met to have valid results in the […]

ft.lb/min is a unit of power. What two units of power are far more commonly used in water and wastewater treatment plant operations? What three components are added together to calculate total dynamic head (TDH)? How many pounds does a ft³ of water weigh? Efficiency of any electromechanical device such as a blower, pump, or […]