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Pressure Transmitter MCQ Test

Test yourself with 20 multiple choice questions. Check your answers to get a score and an explanation for every question.

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Pressure Transmitter MCQ Test: 20 Questions

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

1. Absolute pressure equals:

Answer: Gauge pressure + atmospheric pressure. p_abs = p_gauge + p_atm. Learn more: Absolute Pressure

2. 5 bar g at sea level is about:

Answer: 6.013 bar a. 5 + 1.013 = 6.013 bar a. Learn more: Gauge Pressure

3. Hydrostatic pressure of 10 m of water is about:

Answer: 0.98 bar. ρgh = 1000 × 9.80665 × 10 ≈ 98 kPa. Learn more: Hydrostatic Pressure

4. Transmitter turndown is:

Answer: URL ÷ calibrated span. It shows how far the span is reduced from the sensor limit. Learn more: Transmitter Turndown

5. Which comes first as pressure rises on a sensor?

Answer: URL, then overpressure limit, then burst pressure. URL < overpressure limit < burst pressure. Learn more: Overpressure Limit
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6. A siphon is fitted below a steam pressure gauge to:

Answer: Keep hot steam away with a water seal. Condensate in the loop protects the element. Learn more: Pressure Gauge Siphon

7. A snubber protects a gauge against:

Answer: Pulsation and spikes. It restricts flow into the gauge, smoothing spikes. Learn more: Pressure Snubber

8. EN 837 recommends steady working pressure up to about:

Answer: ¾ of full scale. Up to ¾ for steady and ⅔ for fluctuating pressure. Learn more: Bourdon Tube

9. A transmitter mounted 2 m below its tap on a water filled line reads extra:

Answer: About 19.6 kPa. ρgh = 1000 × 9.80665 × 2 ≈ 19.6 kPa. Learn more: Zero Elevation and Suppression

10. A wet leg on the low side gives which kind of range?

Answer: Elevated zero (negative LRV). The LP head makes DP negative at empty level. Learn more: Zero Elevation and Suppression
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11. Static pressure effect is removed in the field by:

Answer: Zeroing at line pressure with the equaliser open. This removes the zero shift; span effect remains. Learn more: Static Pressure Effect

12. Relief valve blowdown is:

Answer: Difference between set and reseat pressure. Usually stated as % of set pressure. Learn more: Blowdown

13. ASME VIII allowable accumulation for a single non fire relief valve is:

Answer: 10 % of MAWP. 10 % or 3 psi; 16 % for multiple valves; 21 % fire case. Learn more: Accumulation

14. ASME B31.3 hydrostatic test pressure is about:

Answer: 1.5 × design pressure × stress ratio. Piping hydrotest is 1.5 × design with a stress ratio correction. Learn more: Hydrostatic Test Pressure

15. Water hammer pressure rise is estimated by:

Answer: Δp = ρ a Δv. Joukowsky equation. Learn more: Water Hammer
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16. A Bourdon tube works because pressure:

Answer: Straightens a curved oval tube. Pressure tries to make the oval section round, unwinding the tube. Learn more: Bourdon Tube

17. For oxygen service, a diaphragm seal should use:

Answer: Inert halocarbon fill. Hydrocarbon oils can react violently with oxygen. Learn more: Fill Fluid

18. 1 bar is equal to:

Answer: 100 kPa. 1 bar = 100 kPa = 14.504 psi. Learn more: Pressure

19. A gauge pressure transmitter needs its reference side:

Answer: Vented to atmosphere. A blocked vent causes drift with weather and temperature. Learn more: Gauge Pressure

20. Pressure switch deadband is:

Answer: Trip pressure − reset pressure. It prevents chattering near the set point. Learn more: Pressure Switch Deadband
0 of 20 answered
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About this Quiz

20 multiple choice questions on pressure transmitter mcq test, 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: p_abs = p_gauge + p_atm. Learn more: Absolute Pressure
  2. 6.013 bar a: 5 + 1.013 = 6.013 bar a. Learn more: Gauge Pressure
  3. 0.98 bar: ρgh = 1000 × 9.80665 × 10 ≈ 98 kPa. Learn more: Hydrostatic Pressure
  4. URL ÷ calibrated span: It shows how far the span is reduced from the sensor limit. Learn more: Transmitter Turndown
  5. URL, then overpressure limit, then burst pressure: URL < overpressure limit < burst pressure. Learn more: Overpressure Limit
  6. Keep hot steam away with a water seal: Condensate in the loop protects the element. Learn more: Pressure Gauge Siphon
  7. Pulsation and spikes: It restricts flow into the gauge, smoothing spikes. Learn more: Pressure Snubber
  8. ¾ of full scale: Up to ¾ for steady and ⅔ for fluctuating pressure. Learn more: Bourdon Tube
  9. About 19.6 kPa: ρgh = 1000 × 9.80665 × 2 ≈ 19.6 kPa. Learn more: Zero Elevation and Suppression
  10. Elevated zero (negative LRV): The LP head makes DP negative at empty level. Learn more: Zero Elevation and Suppression
  11. Zeroing at line pressure with the equaliser open: This removes the zero shift; span effect remains. Learn more: Static Pressure Effect
  12. Difference between set and reseat pressure: Usually stated as % of set pressure. Learn more: Blowdown
  13. 10 % of MAWP: 10 % or 3 psi; 16 % for multiple valves; 21 % fire case. Learn more: Accumulation
  14. 1.5 × design pressure × stress ratio: Piping hydrotest is 1.5 × design with a stress ratio correction. Learn more: Hydrostatic Test Pressure
  15. Δp = ρ a Δv: Joukowsky equation. Learn more: Water Hammer
  16. Straightens a curved oval tube: Pressure tries to make the oval section round, unwinding the tube. Learn more: Bourdon Tube
  17. Inert halocarbon fill: Hydrocarbon oils can react violently with oxygen. Learn more: Fill Fluid
  18. 100 kPa: 1 bar = 100 kPa = 14.504 psi. Learn more: Pressure
  19. Vented to atmosphere: A blocked vent causes drift with weather and temperature. Learn more: Gauge Pressure
  20. Trip pressure − reset pressure: It prevents chattering near the set point. Learn more: Pressure Switch Deadband
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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