How many hard questions appear in the BACnet exam?

The BACnet exam mixes difficulty levels. Expect roughly 30 to 40 % of hard questions out of 60 to 100 total per session — practicing on questions filtered by difficulty is the best success indicator.

Should I start with hard BACnet questions?

Depends on where you are: if you're starting prep, begin with easy questions and ramp up. If you're 2 weeks from the exam and haven't seen any discriminating items, jump straight to hard BACnet questions to spot your gaps.

BACnet · Hard level

hard BACnet exam questions

BACnet Fundamentals mock exam questions selected at hard level. Ideal for preparing for the discriminating questions you'll see on exam day.

Sourced bank~ 3 minHard

Hard level questions

Q01
BACnet MS/TP uses a token-passing protocol between the Master nodes of an RS-485 segment: the token holder is allowed to communicate during a bounded time slot and then passes the token to the next Master in the logical ring.
TrueFalse
5. MS/TP· Token Passing· Hard
Correct answer
True
Learning tip
Token passing on RS-485 is the conceptual equivalent of a Token Ring. Only Masters can hold the token and initiate communications; Slaves only respond when polled by a Master and never hold the token. The rotating token defines the order of access, eliminates collisions and gives predictable latency. If a Master fails to respond when the token reaches it, the token is skipped after a timeout. In practice an MS/TP segment runs at 9600 to 115 200 baud and tolerates roughly 30 to 100 nodes per segment. The result is more deterministic than half-duplex Ethernet but slower.
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Q02
When an MS/TP segment is not working, the classic checks are: 120 ohm terminations at both ends, bias resistors (typically 680 ohm) installed on one device, a unique MAC per device, the same baud rate on every device, and correct cable polarity.
TrueFalse
22. Practical· MS/TP-Segment Troubleshooting· Hard
Correct answer
True
Learning tip
A pragmatic MS/TP troubleshooting checklist runs through six items: (1) 120 ohm terminations present at both physical ends of the segment, (2) bias resistors fitted on a single device (typically the master) so that the idle line is correctly polarised, (3) unique MAC addresses with no duplicates, (4) identical baud rate on every device, (5) correct polarity (e.g. blue/white pairing respected), and (6) a 120 ohm-impedance twisted-pair cable. Around 80 % of MS/TP issues encountered in the field can be traced back to one of these six points.
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Q03
Niagara Workbench (Tridium/Honeywell) is a Java-based engineering tool that supports visual programming (wire sheet), BACnet configuration and deployment to JACE controllers for multi-protocol BMS projects.
TrueFalse
23. Engineering· Niagara Workbench· Hard
Correct answer
True
Learning tip
Niagara Workbench combines a drag-and-drop wire-sheet editor for graphical programming, an Object palette with BACnet, Modbus, KNX and OPC UA components, Histories for trend logging and reporting, visual Schedules with weekly views and exceptions, drivers that import GSD/GSDML and similar descriptors, and a web UI toolkit for deployable HMI views. It has become the standard engineering platform for modern commercial BMS projects in Europe and North America, with licence cost driven per JACE and per point and typical project totals in the 5-50 k euro range.
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