C7 Energy Management & Building Automation 3

Question 1

What wiring topology does KNX TP (twisted pair) typically use for field devices?

Accepted Answer

Free topology (bus, star, tree, or combination)

Answer

KNX TP supports free topology, allowing installers to wire devices in bus, star, tree, or mixed configurations within segment length limits.

Question 2

An energy management system (EMS) implements 'load rolling' to:

Accepted Answer

Rotate which electrical loads are shed during peak demand periods

Answer

Load rolling cycles the shutdown of non-critical loads in sequence during peak demand events so no single area is without service for extended periods.

Question 3

Which California energy code provision requires newly installed lighting controls to include a manual-on function limited to a specific zone area?

Accepted Answer

Title 24 Part 6 Section 130.1 occupancy sensor requirements

Answer

Title 24 Part 6 Section 130.1 governs indoor lighting controls and specifies occupancy sensor requirements including manual-on functionality and zone area limits.

Question 4

A BAS supervisor discovers that a field controller's real-time clock has drifted by 45 minutes. What is the most likely effect on the system?

Accepted Answer

Schedules executing at incorrect times, causing energy waste or comfort complaints

Answer

An incorrect clock causes time-based schedules (occupancy, setpoint shifts, lighting scenes) to run at wrong times, degrading energy performance and occupant comfort.

Question 5

In a chilled water system, 'chiller sequencing' logic in a BAS is used to:

Accepted Answer

Determine the order and number of chillers to enable based on cooling load

Answer

Chiller sequencing optimizes efficiency by staging chillers on and off based on real-time cooling demand rather than running all units at partial load.

(C7) California C7 Low Voltage Systems Contractor Certification Practice Test

(C7) California C7 Low Voltage Systems Contractor Certification Practice Test

C7 Energy Management & Building Automation 3