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Measurement of Fluid pressure – MCQ Set with Explanations


MCQ Set with Explanations

Measurement of Fluid pressure

1. A manometer is primarily used to measure:

  • A) Temperature

  • B) Pressure difference

  • C) Velocity

  • D) Density

Answer: B Explanation: Manometers measure pressure difference using a liquid column.

 

2. The instrument used to measure very small pressure differences is:

  • A) Bourdon gauge

  • B) Piezometer

  • C) Inclined manometer

  • D) Barometer

Answer: C Explanation: Inclined manometers increase sensitivity by extending the length of the liquid column.

 

3. A piezometer can measure:

  • A) Negative pressure

  • B) Very high pressure

  • C) Only positive gauge pressure

  • D) Atmospheric pressure

Answer: C Explanation: Piezometers measure positive gauge pressure only, since the liquid rises in a vertical tube.

 

4. A barometer is used to measure:

  • A) Absolute pressure

  • B) Gauge pressure

  • C) Vacuum pressure

  • D) Differential pressure

Answer: A Explanation: Barometers measure atmospheric pressure, which is a type of absolute pressure.

 

5. The unit of pressure head is:

  • A) Pascal

  • B) Newton

  • C) Meter

  • D) kg/m³

Answer: C Explanation: Pressure head is expressed as height of a fluid column → meters.

 

6. Bourdon tube pressure gauges measure:

  • A) Absolute pressure

  • B) Gauge pressure

  • C) Differential pressure

  • D) Vapor pressure

Answer: B Explanation: Bourdon gauges measure gauge pressure (pressure above atmospheric).

 

7. A U‑tube manometer contains two fluids. The heavier fluid is used to:

  • A) Increase sensitivity

  • B) Reduce sensitivity

  • C) Measure temperature

  • D) Reduce friction

Answer: B Explanation: Heavier fluids produce smaller height differences, reducing sensitivity.

 

8. Vacuum pressure is defined as:

  • A) Absolute pressure + atmospheric pressure

  • B) Atmospheric pressure – absolute pressure

  • C) Gauge pressure + atmospheric pressure

  • D) Absolute pressure – gauge pressure

Answer: B Explanation: Vacuum pressure is the difference between atmospheric and absolute pressure.

 

9. The pressure measured relative to a perfect vacuum is called:

  • A) Gauge pressure

  • B) Absolute pressure

  • C) Static pressure

  • D) Differential pressure

Answer: B Explanation: Absolute pressure is measured from zero pressure (perfect vacuum).

 

10. In a U‑tube manometer, if the height difference increases, the pressure difference:

  • A) Decreases

  • B) Increases

  • C) Remains constant

  • D) Becomes zero

Answer: B 

Explanation: Pressure difference is directly proportional to height difference. 



 

 

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