Practice

Quick, no-login quizzes for sharpening field knowledge. Content quizzes pair with the Education pages — every question links back to the lesson it came from, so you can flip a page you just read into a quick self-check. Field drills reach broader: scenarios, protocol quirks, troubleshooting, and the kind of "things you'd be asked in an interview" set that doesn't always have a matching page on this site yet. New to the field? Surviving Your First Months is the gentlest place to start. Pick a card.

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Content Quizzes covered by the site

Every question links to the lesson or tool that explains it. Newcomers can read a page, then quiz themselves; reviewers can drill the gotchas without re-reading the whole thing.

QUIZ :: PID BASICS GO
PID Basics
Tell proportional, integral, and derivative apart — the droop P leaves and how integral erases it, too-fast reset, and why HVAC runs PI.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: HYDRONIC LOOPS GO
Hydronic Loops
Why does direct return self-unbalance while reverse return self-balances? Plus the primary-secondary twin-T and its closely-spaced tees.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: LOAD PIPING GO
Load Piping
Two-way vs three-way valves, variable vs constant system flow, mixing vs diverting, pump pairing, and the minimum-flow bypass.
10 QuestionsMCQ · TF · Gotcha~ 5 min
QUIZ :: VFDS GO
VFDs
Three power stages — rectifier, DC bus, inverter — plus the cube law, the run-command vs. speed-reference trap, run status, and reading fault categories.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: PUMP CONTROL GO
Pump Control
Find the operating point where pump and system curves cross — the affinity and cube laws, remote vs local DP sensing, and DP setpoint reset.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: EQUIPMENT STAGING GO
Equipment Staging
Why run parallel units at all? The stage-up/stage-down deadband, the stage delay and minimum stage time, and lead rotation for even wear.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: HYDRONIC BALANCING GO
Hydronic Balancing
CBVs and the square-root law, ABV compensation range, PICVs and DP reset, and reading the symptoms of an unbalanced loop.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: REFRIGERANT CYCLE GO
Refrigerant Cycle Basics
After the refrigerant-cycle lesson: the four components, high side vs. low side, the pressure-temperature saturation lock, and where blend glide shows up.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: SUPERHEAT & SC GO
Superheat & Subcooling
Pin down what each measures and on which line — the dew/bubble formulas, and what a high or low reading on either one points toward.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: TXV VS EEV GO
TXVs vs. EEVs
The mechanical TXV force balance, the electronic EEV control loop, and what each does to hold a target superheat as load drifts.
10 QuestionsMCQ · TF · Gotcha~ 5 min
QUIZ :: PSYCHROMETRICS GO
Psychrometrics Basics
Seven properties, why any two lock the rest, the four chart process families, and the RH / dew-point / enthalpy gotchas.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: AHUS GO
Air Handlers
Walk the unit from memory — station order, minimum outside air and relief, the mixed-air arithmetic that exposes a stuck damper, filter ΔP, and fan heat.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: ECONOMIZERS GO
Economizers
Free cooling from memory — the linked damper set, the mixing math backwards, dry-bulb vs enthalpy changeover, integrated staging, and the stuck-damper tells.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: BUILDING PRESSURE GO
Building Pressure
Keep the ledger from memory — why buildings go positive or negative, sizing the OA minimum, barometric vs power exhaust vs tracking, and the heavy-door diagnosis.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: UNIT IDENTIFICATION GO
Unit Identification
Name the boxes from memory — the three field questions, packaged vs built-up vs makeup air, the lineset, tonnage from a model number, and when the paper lies.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: VAV SYSTEMS GO
VAV Systems
Volume not temperature, flow from K and velocity pressure, the damper nobody sets, reheat at minimum, and the starved-coil gotcha — from memory.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: DUCT STATIC GO
Duct Static Control
Close the chapter from memory — why static is the signal, the sensor two-thirds out, trim and respond, the railed transducer, and who decides flow.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: FUNCTION BLOCKS GO
Function Blocks
Blocks and pins, digital vs. analog wires, the block families, how a scan resolves feedback, and a worked economizer sheet.
10 QuestionsMCQ · TF · Gotcha~ 5 min
QUIZ :: MODBUS BASICS GO
Modbus Basics
Self-check on the Modbus fundamentals — the four data tables, the FC03 / FC04 / FC16 pairs, the client-polls model, and high-bit exception responses.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: MODBUS DECODING GO
Modbus Decoding
Four decoding gotchas — the 5-digit address trap, signed vs unsigned, byte order, and scaling — plus FC03 / FC04 confusion and exception responses.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: BACNET BASICS GO
BACnet Basics
The self-describing object model, device instances, the everyday services, and the priority array's lowest-non-null-slot rule.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: BACNET NETWORKING GO
BACnet Networking
Trace the addressing and broadcast story — the three identifier layers, BBMDs and the asymmetric-BDT trap, Foreign Device TTLs, and EBO hex decoding.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min
QUIZ :: BACNET MS/TP GO
BACnet MS/TP
Which layer is the trunk failing at — the token ring and its Max_Master ceiling, the duplicate-MAC flicker, or the two wires: termination, polarity, bias.
10 QuestionsMCQ · TF · Gotcha · Numeric~ 5 min

Field Drills broader scope · field-knowledge

Wider scope than the lessons — scenarios, troubleshooting, the kind of habits and surprises that don't always have a matching page on the site. Explanations stay inline since not every topic is covered here yet; when one keeps coming up, it becomes a candidate for a new education page.

QUIZ :: FIRST MONTHS GO
Surviving Your First Months
Broad sampler for techs in their first few months in the field — safety basics, panel anatomy, sensor failure modes, 4-20 mA live zero, VFD quirks, and workflow habits that pay off early.
10 QuestionsMCQ · TF · NumericField Sampler~ 5 min
QUIZ :: CONTROLLER SWAP GO
Controller Swap
Replacing a DDC controller end to end — documenting and re-landing field wiring, re-using the MS/TP address and device instance, EOL termination, config backup, download, graphics re-bind, and commissioning the sequence.
10 QuestionsMCQ · TF · Gotcha · NumericHardware + Software~ 5 min
QUIZ :: FIELD WIRING GO
Field Wiring & Sensors
The wire-and-sensor layer that bites before any logic runs — thermistor and RTD curves, 2/3/4-wire lead compensation, AI vs AO, the 4-20 mA live zero, loop power, shield grounding, and sourcing vs sinking inputs.
10 QuestionsMCQ · TF · Gotcha · NumericWiring + Sensors~ 5 min
QUIZ :: SEQUENCING GO
Sequencing Scenarios
How real sequences of operation behave — chiller and boiler plant staging and deadbands, lead/lag rotation, AHU economizer changeover (dry-bulb vs enthalpy), and the overcool-and-reheat dehumidification cascade.
10 QuestionsMCQ · TF · GotchaSequence Scenarios~ 5 min
QUIZ :: TROUBLESHOOTING GO
Troubleshooting
Symptom → most-likely-cause reasoning across the trade — a pingable-but-undiscoverable BACnet device, Modbus exceptions and byte order, low-ΔT hydronics, an air-bound coil, superheat vs subcooling, and VFD start trips.
10 QuestionsMCQ · TF · GotchaSymptom → Cause~ 5 min
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