10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free C-275 questions are organized by exam domain, so you can see how each part of the Process Data Acquisition 1 (C-275) blueprint is tested. Reveal the answer and explanation under each question.
A disconnected three-wire Pt100 has unmarked leads X, Y, and Z. Resistance checks give X-Y = 0.8 Ω, X-Z = 110.4 Ω, and Y-Z = 110.4 Ω. The recorder's wiring diagram assigns terminal 1 to the single lead at one end of the element and terminals 2 and 3 to the two leads at the other end. Which connection preserves three-wire lead compensation?
Correct answer: B - Z to terminal 1; X to terminal 2; Y to terminal 3.
A Type K thermocouple is correctly connected as far as a junction box, but both conductors from that box to the recorder are copper. Internal cold-junction compensation measures only the recorder's terminals. The process and recorder-terminal temperatures stay constant, yet the indication drifts as the junction box warms. Both connections inside the box are at the same temperature. What correction removes this temperature-dependent error?
Correct answer: A - Use correctly polarized Type K extension wire instead of copper.
A voltage channel is intended to convert 0-10 V to 0-200 kPa. With the transmitter disconnected, a traceable source produces these results: 0 V → 6 kPa; 5 V → 106 kPa; 10 V → 206 kPa. The recorder's raw-voltage reading agrees with the source at every point. How should the error in the engineering-unit indication be classified?
Correct answer: D - A positive offset with unchanged span.
A transmitter's 0-10 V output is specified for loads of at least 100 kΩ. A 10 MΩ meter confirms the correct output before connection, but the voltage falls when a recorder with a fixed 20 kΩ input is attached. The meter and recorder then agree on the lower voltage. Wiring and common-mode limits are satisfactory. What modification addresses the cause rather than hiding the error?
Correct answer: D - Insert a signal buffer with at least 100 kΩ input resistance.
A temperature transmitter maps 4-20 mA to 0-200°C. Its documented configuration reserves 3.5 mA for a detected sensor fault; ordinary measurement output cannot fall below 3.8 mA. During operation, both the recorder and a series meter indicate 3.50 mA. Simulation is off. The recorder nevertheless extrapolates a negative temperature and marks it valid. What does the current actually establish?
Correct answer: A - A fault indication, not a valid process-temperature measurement.
The commissioning sheet for a flowmeter specifies 450 pulses/L. Clean pulses arrive at 180 Hz, and the recorder counts rising edges only, with no missed pulses. A low-flow warning turns on below 20 L/min and has no delay or hysteresis. A successful checkout would show which result?
Correct answer: C - 24 L/min; low-flow warning inactive.
An archive retains only the minimum and maximum sampled pressure for each minute, stamped with the interval's end time. The 14:21 entry contains 88 kPa and 112 kPa; all samples were valid. No individual samples or alarm-transition times survive. A reviewer asks how long pressure exceeded 105 kPa during that minute. Which finding is defensible?
Correct answer: B - An exceedance was sampled, but its duration cannot be determined.
After an interrupted Ethernet archive transfer, an operator retries by appending the entire file. The PC dataset now contains repeated blocks with identical channel IDs, timestamps, and values. The recorder's closed source archive remains complete. The reporting software can import that source into a new dataset. How should a faithful PC record be restored?
Correct answer: C - Import into a clean dataset and verify one copy of each original sample.
An approved range change was made at a recorder during maintenance. The setup file on the service PC predates that change. Before further edits, the technician needs a backup of the recorder exactly as it is now, without altering its active settings. Which operation creates that backup?
Correct answer: A - Read the recorder's active configuration into a new PC file.
A remotely powered monitor must see a closed circuit while a recorder is healthy and an open circuit on either a recorder alarm or loss of recorder power. The recorder provides a changeover dry-contact relay. Which coil configuration and contact pair meet both requirements?
Correct answer: B - Energized when healthy; use COM-NO.
The C-275 exam also covers these domains. Drill them in the full free practice test:
The full bank has 1,020 more C-275 questions with explanations.
Continue in the free practice test →
View plans