CMM Building Systems Operations & Maintenance 2

Question 1

Which ASHRAE standard establishes minimum requirements for a water management program to reduce Legionella risk in building water systems such as cooling towers?

Accepted Answer

ASHRAE Standard 188

Answer

ASHRAE 188 covers Legionellosis risk management for building water systems, including cooling towers.

Question 2

A water-cooled chiller shows a steadily rising condenser approach temperature while load is unchanged. What is the most likely cause?

Accepted Answer

Fouled or scaled condenser tubes

Answer

Scale or fouling on condenser tubes reduces heat transfer, widening the approach between refrigerant and leaving water temperatures.

Question 3

MERV ratings used to select air filters are defined by which test standard?

Accepted Answer

ASHRAE Standard 52.2

Answer

ASHRAE 52.2 defines the Minimum Efficiency Reporting Value test method for air cleaning devices.

Question 4

What is the primary function of an air-side economizer on an air handling unit?

Accepted Answer

Use cool outdoor air for free cooling when conditions allow

Answer

An economizer increases outdoor air intake when its temperature or enthalpy is low enough to reduce mechanical cooling.

Question 5

Why is regular blowdown performed on a steam boiler?

Accepted Answer

To remove concentrated dissolved solids and sludge from the boiler water

Answer

Blowdown controls total dissolved solids and removes sludge that would otherwise cause scale, carryover, and corrosion.

CMM - Certified Building Maintenance Manager Practice Test

CMM - Certified Building Maintenance Manager Practice Test

CMM Building Systems Operations & Maintenance 2