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Flow 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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Flow Measurement Quiz: 15 Questions
Choose one answer for each question, then press Check answers. Explanations appear after checking.
1. In a DP flowmeter, if flow halves, the DP becomes:
Answer: One quarter. DP ∝ Q², so (0.5)² = 0.25.
2. The beta ratio of an orifice is:
Answer: Bore ÷ pipe diameter. β = d ÷ D.
3. Flow is generally turbulent when the Reynolds number is above about:
Answer: 4000. Above about 4000 flow is turbulent; below 2300 it is laminar.
4. A magnetic flowmeter cannot measure:
Answer: Hydrocarbon oil. It needs a conductive liquid; oils are non conductive.
5. A Coriolis meter directly measures:
Answer: Mass flow and density. Coriolis measures mass flow, and density from tube frequency.
6. A vortex meter works on the principle of:
Answer: Von Kármán vortex shedding. The shedding frequency is proportional to velocity.
7. Square root extraction for a DP flow loop should be done:
Answer: In only one place. Applying it twice gives a large error.
8. Typical upstream straight run for many flowmeters is about:
Answer: 10 D. About 10 D upstream and 5 D downstream is a common guide; check the meter data sheet.
9. Q = A × v. If the pipe diameter doubles at the same flow, velocity becomes:
Answer: One quarter. Area ∝ D², so velocity falls to one quarter.
10. Nm³/h refers to gas volume at:
Answer: Reference conditions (usually 0 °C, 1.01325 bar a). Normal cubic metres are at reference conditions.
11. A turbine meter K factor is expressed in:
Answer: Pulses per unit volume. K factor = pulses per litre (or per m³).
12. The main disadvantage of an orifice plate is:
Answer: High permanent pressure loss and limited turndown. Orifices lose 40 to 90 % of the DP and have about 4:1 turndown per range.
13. Ultrasonic transit time meters work best on:
Answer: Clean liquids or gases. Transit time needs a clean acoustic path; Doppler suits fluids with particles.
14. A low flow cut off is used on DP flow because:
Answer: The square root amplifies noise near zero. Near zero, small DP noise becomes large flow noise.
15. 1 m³/h is approximately:
Answer: 4.40 US gpm. 1 m³/h = 4.403 US gpm (and 16.67 L/min).
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About this Quiz
15 multiple choice questions on flow 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
- One quarter: DP ∝ Q², so (0.5)² = 0.25.
- Bore ÷ pipe diameter: β = d ÷ D.
- 4000: Above about 4000 flow is turbulent; below 2300 it is laminar.
- Hydrocarbon oil: It needs a conductive liquid; oils are non conductive.
- Mass flow and density: Coriolis measures mass flow, and density from tube frequency.
- Von Kármán vortex shedding: The shedding frequency is proportional to velocity.
- In only one place: Applying it twice gives a large error.
- 10 D: About 10 D upstream and 5 D downstream is a common guide; check the meter data sheet.
- One quarter: Area ∝ D², so velocity falls to one quarter.
- Reference conditions (usually 0 °C, 1.01325 bar a): Normal cubic metres are at reference conditions.
- Pulses per unit volume: K factor = pulses per litre (or per m³).
- High permanent pressure loss and limited turndown: Orifices lose 40 to 90 % of the DP and have about 4:1 turndown per range.
- Clean liquids or gases: Transit time needs a clean acoustic path; Doppler suits fluids with particles.
- The square root amplifies noise near zero: Near zero, small DP noise becomes large flow noise.
- 4.40 US gpm: 1 m³/h = 4.403 US gpm (and 16.67 L/min).
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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