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Pressure 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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Pressure Measurement Quiz: 15 Questions

Choose one answer for each question, then press Check answers. Explanations appear after checking.

1. Absolute pressure equals:

Answer: Gauge pressure + atmospheric pressure. Pabs = Pgauge + Patm.

2. 1 bar is approximately:

Answer: 14.5 psi. 1 bar = 14.504 psi.

3. A column of water 10 m high exerts about:

Answer: 0.98 bar. P = ρgh = 1000 × 9.81 × 10 ≈ 98 kPa ≈ 0.98 bar.

4. A Bourdon tube gauge on steam service should be fitted with:

Answer: A siphon (pigtail). The siphon holds condensate that protects the Bourdon tube from live steam temperature.

5. For a gauge, the normal operating pressure should ideally be:

Answer: In the middle third of the scale. Working in the middle of the scale gives best accuracy and life.

6. Accuracy class 1.0 on a 0 to 10 bar gauge allows an error of:

Answer: ± 0.1 bar. Class 1.0 means ± 1 % of span: 0.1 bar.

7. When removing a DP transmitter from service with a 3 valve manifold, the first step is:

Answer: Open the equaliser valve. Open the equaliser first so the sensor never sees one sided line pressure.

8. Which sensor principle is used in most smart pressure transmitters?

Answer: Capacitive or piezoresistive. Capacitive and piezoresistive (silicon) sensors dominate smart transmitters.

9. A compound gauge measures:

Answer: Both vacuum and positive pressure. A compound gauge reads below and above atmospheric pressure.

10. Turndown of a transmitter with URL 250 mbar calibrated 0 to 50 mbar is:

Answer: 5:1. Turndown = URL ÷ span = 250 ÷ 50 = 5:1.

11. Static pressure effect in a DP transmitter mainly causes:

Answer: A zero shift at line pressure. High line pressure on both sides can shift the zero; it is trimmed at line pressure.

12. A diaphragm seal is used mainly for:

Answer: Corrosive, viscous, hot or clogging fluids. The seal isolates the instrument from the process fluid.

13. 1 psi equals approximately:

Answer: 6.895 kPa. 1 psi = 6.895 kPa = 68.95 mbar.

14. A pressure switch trips at 8.2 bar rising and resets at 7.6 bar. The deadband is:

Answer: 0.6 bar. Deadband = trip − reset = 0.6 bar.

15. Liquid filled gauges are mainly used to:

Answer: Damp pointer vibration and pulsation. The fill fluid damps vibration and pulsation and lubricates the movement.
0 of 15 answered
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About this Quiz

15 multiple choice questions on pressure 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
  1. Gauge pressure + atmospheric pressure: Pabs = Pgauge + Patm.
  2. 14.5 psi: 1 bar = 14.504 psi.
  3. 0.98 bar: P = ρgh = 1000 × 9.81 × 10 ≈ 98 kPa ≈ 0.98 bar.
  4. A siphon (pigtail): The siphon holds condensate that protects the Bourdon tube from live steam temperature.
  5. In the middle third of the scale: Working in the middle of the scale gives best accuracy and life.
  6. ± 0.1 bar: Class 1.0 means ± 1 % of span: 0.1 bar.
  7. Open the equaliser valve: Open the equaliser first so the sensor never sees one sided line pressure.
  8. Capacitive or piezoresistive: Capacitive and piezoresistive (silicon) sensors dominate smart transmitters.
  9. Both vacuum and positive pressure: A compound gauge reads below and above atmospheric pressure.
  10. 5:1: Turndown = URL ÷ span = 250 ÷ 50 = 5:1.
  11. A zero shift at line pressure: High line pressure on both sides can shift the zero; it is trimmed at line pressure.
  12. Corrosive, viscous, hot or clogging fluids: The seal isolates the instrument from the process fluid.
  13. 6.895 kPa: 1 psi = 6.895 kPa = 68.95 mbar.
  14. 0.6 bar: Deadband = trip − reset = 0.6 bar.
  15. Damp pointer vibration and pulsation: The fill fluid damps vibration and pulsation and lubricates the movement.
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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