ESCO Building Automation and Energy Management Control Systems

Question 1

What does an air-side economizer do in a BAS sequence?

Accepted Answer

Brings in more outdoor air for free cooling when outdoor conditions allow

Answer

When outdoor air is cool and dry enough, the economizer opens the outdoor air dampers to meet cooling load with less mechanical cooling.

Question 2

What does an optimal start routine calculate?

Accepted Answer

The latest start time that still reaches setpoint by occupancy

Answer

Optimal start uses indoor and outdoor temperatures and the building's learned response to delay equipment start as long as possible, which cuts runtime and still reaches setpoint at occupancy.

Question 3

Which open communication protocol, published as ASHRAE Standard 135, is widely used for interoperable building automation?

Accepted Answer

BACnet

Answer

BACnet (Building Automation and Control Networks) is defined by ASHRAE/ANSI Standard 135 and lets devices from different manufacturers talk to each other.

Question 4

Demand-controlled ventilation (DCV) usually adjusts outdoor air based on which sensor?

Accepted Answer

CO2 concentration in the space

Answer

CO2 level tracks occupancy. DCV cuts outdoor air when spaces are lightly occupied, which saves heating and cooling energy while keeping ventilation adequate.

Question 5

In a VAV system, what is the energy benefit of a 'trim and respond' duct static pressure reset?

Accepted Answer

It lowers the static pressure setpoint until a VAV box calls for more air, cutting fan energy

Answer

Fan power falls steeply as pressure drops. Trim and respond keeps static pressure only as high as the most demanding zone needs.

ESCO - Energy Service Company Practice Test

ESCO - Energy Service Company Practice Test

ESCO Building Automation and Energy Management Control Systems