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Temperature Measurement Quiz
Test yourself with 15 multiple choice questions. Check your answers to get a score and an explanation for every question.
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Temperature Measurement Quiz: 15 Questions
Choose one answer for each question, then press Check answers. Explanations appear after checking.
1. A Pt100 has a resistance of:
Answer: 100 Ω at 0 °C. Pt100: 100 Ω at 0 °C (IEC 60751).
2. The resistance of a Pt100 at 100 °C is about:
Answer: 138.5 Ω. 138.51 Ω.
3. Which thermocouple type has the widest common use and range up to about 1200 °C?
Answer: Type K. Type K, NiCr/NiAl.
4. The 3 wire RTD connection is used to:
Answer: Compensate for lead resistance. The third wire lets the transmitter cancel lead resistance.
5. Cold junction compensation is needed for:
Answer: Thermocouples. A thermocouple measures the difference between hot and cold junctions.
6. In ANSI MC96.1 thermocouple colours, the negative wire is:
Answer: Red. ANSI makes the negative conductor red for all types.
7. Under IEC 60584-3, type K positive conductor colour is:
Answer: Green. IEC type K: green positive, white negative.
8. A shorted thermocouple extension cable makes the reading:
Answer: Read the temperature at the short. The short forms a new junction at that point.
9. RTDs are generally preferred over thermocouples for:
Answer: Better accuracy and stability below about 600 °C. RTDs are more accurate and stable in their range.
10. A thermowell is used to:
Answer: Protect the sensor and allow removal without process shutdown. The well keeps the process sealed when the sensor is removed.
11. Class A tolerance of a Pt100 at 100 °C is:
Answer: ± 0.35 °C. ± (0.15 + 0.002 × 100) = ± 0.35 °C.
12. °F for 100 °C is:
Answer: 212 °F. 100 × 9/5 + 32 = 212 °F.
13. Thermowell wake frequency calculation is covered by:
Answer: ASME PTC 19.3 TW. ASME PTC 19.3 TW covers thermowell design and wake frequency.
14. Burnout direction in a temperature transmitter decides:
Answer: Output on sensor failure (upscale or downscale). It sets whether a broken sensor drives the output high or low.
15. Type B thermocouples are suitable for:
Answer: Very high temperatures up to about 1700 °C. Type B (Pt30Rh/Pt6Rh) is used from about 600 to 1700 °C.
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About this Quiz
15 multiple choice questions on temperature measurement, the kind asked in instrumentation interviews, technician exams and plant training. Each answer comes with a short explanation, so the quiz works as a revision sheet too.
Show answer key
- 100 Ω at 0 °C: Pt100: 100 Ω at 0 °C (IEC 60751).
- 138.5 Ω: 138.51 Ω.
- Type K: Type K, NiCr/NiAl.
- Compensate for lead resistance: The third wire lets the transmitter cancel lead resistance.
- Thermocouples: A thermocouple measures the difference between hot and cold junctions.
- Red: ANSI makes the negative conductor red for all types.
- Green: IEC type K: green positive, white negative.
- Read the temperature at the short: The short forms a new junction at that point.
- Better accuracy and stability below about 600 °C: RTDs are more accurate and stable in their range.
- Protect the sensor and allow removal without process shutdown: The well keeps the process sealed when the sensor is removed.
- ± 0.35 °C: ± (0.15 + 0.002 × 100) = ± 0.35 °C.
- 212 °F: 100 × 9/5 + 32 = 212 °F.
- ASME PTC 19.3 TW: ASME PTC 19.3 TW covers thermowell design and wake frequency.
- Output on sensor failure (upscale or downscale): It sets whether a broken sensor drives the output high or low.
- Very high temperatures up to about 1700 °C: Type B (Pt30Rh/Pt6Rh) is used from about 600 to 1700 °C.
Tip: take the quiz before an interview, note the questions you missed and read the linked article for those topics.
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Frequently Asked Questions
Is this quiz free?
Yes. No sign up is needed and you can retake it as often as you like.
Are the answers explained?
Yes. After you check your answers, each question shows the correct answer and a short explanation.
Where can I find more questions?
See the Interview Q&A section of instrumentationblog.in and the linked article below.
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