Which of the following methods are used to change pump flow to match load in an operating system? Select all that apply.
A) Staging of multiple pumps.
B) Variable-speed drive.
C) Adjusting impeller size on the fly.
D) Valves.
A) Staging of multiple pumps. , B) Variable-speed drive. and D) Valves.
You might also like to view...
One of the minor differences between troubleshooting a geothermal heat pump and an air-to-air heat pump is how to gain access to pressures and temperatures in the water or ground loop.
Answer the following statement true (T) or false (F)
Centrum Water & Gas provides standby power to pumping stations using diesel-powered generators. An alternative is the use of natural gas to power the generators, but it will be a few years before the gas is available at remote sites. Centrum estimates that by switching to gas, it will save $15,000 per year, starting 3 years from now through the end of year 20. At an interest rate of 8% per year, determine the present worth of the projected savings.
What will be an ideal response?
List four examples of a confined space.____________________________________________________________________________________________________________________________________________________________________________________
What will be an ideal response?
The main duties of the U.S. Department of Homeland Security include
A. preventing terrorist attacks within the United States B. reducing the vulnerability of the United States to terrorism C. minimizing the damage and assisting in the recovery from terrorist attacks in the United States D. all of the above