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Questions and Answers
Which type of manometer measures absolute pressure?
Which type of manometer measures absolute pressure?
- Inclined manometer
- Cistern manometer (correct)
- Industrial U-tube manometer
- Simple U-tube manometer (correct)
What shape is NOT commonly used for diaphragms in capsule gauges?
What shape is NOT commonly used for diaphragms in capsule gauges?
- Cylindrical (correct)
- Dished
- Flat
- Conical (correct)
Which of the following is a type of differential pressure measurement?
Which of the following is a type of differential pressure measurement?
- Metallic capsule
- Single diaphragm (correct)
- Slack diaphragm
- Metallic bellows (correct)
Which type of diaphragm is used in bellows?
Which type of diaphragm is used in bellows?
Which type of pressure does a gauge pressure measurement indicate?
Which type of pressure does a gauge pressure measurement indicate?
What defines pressure in a physical context?
What defines pressure in a physical context?
Which of the following is NOT a type of static pressure?
Which of the following is NOT a type of static pressure?
What is the equation used to calculate pressure?
What is the equation used to calculate pressure?
Which tool is commonly used for measuring static pressure?
Which tool is commonly used for measuring static pressure?
Which type of pressure is defined as the sum of atmospheric pressure and gauge pressure?
Which type of pressure is defined as the sum of atmospheric pressure and gauge pressure?
What type of manometer is the simplest form of pressure measurement?
What type of manometer is the simplest form of pressure measurement?
Which type of pressure can vary over time?
Which type of pressure can vary over time?
Which of the following is NOT a method of measuring pressure?
Which of the following is NOT a method of measuring pressure?
What does the gauge pressure measure?
What does the gauge pressure measure?
Which one of the following is a type of differential pressure measurement?
Which one of the following is a type of differential pressure measurement?
What type of pressure measurement is primarily associated with the Ring balance manometer?
What type of pressure measurement is primarily associated with the Ring balance manometer?
Which of the following manometers utilizes a two-liquid setup?
Which of the following manometers utilizes a two-liquid setup?
When a pressure difference is applied across the partition in a Ring balance manometer, what occurs?
When a pressure difference is applied across the partition in a Ring balance manometer, what occurs?
Which of the following is NOT a type of pressure measured?
Which of the following is NOT a type of pressure measured?
What is the main advantage of using a two-liquid setup in pressure measurement?
What is the main advantage of using a two-liquid setup in pressure measurement?
Which of the following pressure measurement types can provide a direct indication of atmospheric pressure?
Which of the following pressure measurement types can provide a direct indication of atmospheric pressure?
What is the primary advantage of using a two-liquid U-tube manometer for measuring small pressure differences?
What is the primary advantage of using a two-liquid U-tube manometer for measuring small pressure differences?
In which application is a two-liquid U-tube manometer NOT commonly used?
In which application is a two-liquid U-tube manometer NOT commonly used?
When measuring differential pressure, which device setup is typically employed?
When measuring differential pressure, which device setup is typically employed?
What does the term 'gauge pressure' refer to?
What does the term 'gauge pressure' refer to?
Which type of pressure measurement is specifically highlighted for its sensitivity to low-density gases?
Which type of pressure measurement is specifically highlighted for its sensitivity to low-density gases?
What is one common application of a two-liquid U-tube manometer in industrial processes?
What is one common application of a two-liquid U-tube manometer in industrial processes?
Which manometer is particularly suitable for measuring small pressure changes?
Which manometer is particularly suitable for measuring small pressure changes?
In a typical manometric setup, what is the primary function of the diaphragm?
In a typical manometric setup, what is the primary function of the diaphragm?
Why are two-liquid U-tube manometers preferred for laboratory experiments involving precise air measurement?
Why are two-liquid U-tube manometers preferred for laboratory experiments involving precise air measurement?
How does a two-liquid U-tube manometer compensate for low-pressure fluctuations?
How does a two-liquid U-tube manometer compensate for low-pressure fluctuations?
What is the relationship expressed in the formula $p_1 - p_2 = g h (\rho_2 - \rho_1)$?
What is the relationship expressed in the formula $p_1 - p_2 = g h (\rho_2 - \rho_1)$?
Which characteristic is critical for accurately measuring pressure in ventilation systems using a two-liquid U-tube manometer?
Which characteristic is critical for accurately measuring pressure in ventilation systems using a two-liquid U-tube manometer?
What is the main advantage of using an inclined tube manometer compared to a simple U-tube manometer?
What is the main advantage of using an inclined tube manometer compared to a simple U-tube manometer?
In the formula $p_1 - p_2 = \rho g d \cdot sin \alpha$, what does $d$ represent?
In the formula $p_1 - p_2 = \rho g d \cdot sin \alpha$, what does $d$ represent?
When comparing the pressures in an inclined tube manometer, which condition allows the ratio $A_2/A_1$ to be neglected?
When comparing the pressures in an inclined tube manometer, which condition allows the ratio $A_2/A_1$ to be neglected?
Which of the following types of manometers is NOT mentioned as a type of differential pressure measurement device?
Which of the following types of manometers is NOT mentioned as a type of differential pressure measurement device?
What is measured by a differential pressure manometer?
What is measured by a differential pressure manometer?
Which parameter affects the accuracy of a manometer measurement?
Which parameter affects the accuracy of a manometer measurement?
Which type of pressuring device employs diaphragms in its measurement mechanism?
Which type of pressuring device employs diaphragms in its measurement mechanism?
When analyzing an inclined tube manometer, which of the following equations correctly relates pressure difference to fluid height?
When analyzing an inclined tube manometer, which of the following equations correctly relates pressure difference to fluid height?
What does the term 'static pressure' generally refer to?
What does the term 'static pressure' generally refer to?
What is the primary purpose of using a manometer?
What is the primary purpose of using a manometer?
Study Notes
Introduction
- Inaccurate pressure measurement can lead to disasters
Pressure Definition
- Pressure is defined as the normal force per unit area exerted by a fluid on a surface
- P=F/A, where P - Pressure, F - Normal force, A - Area
Types of Pressure
- Two types of pressures exist: Static and Dynamic
- Static Pressure: force is constant in time
- Dynamic Pressure: force is varying in time
Static Pressure Measurement
- Static pressure measurements include: Absolute, Gauge, and Differential Pressure
- Pabs = Patm + Pg, where Pabs - Absolute pressure, Patm - Atmospheric pressure, Pg - Gauge pressure
Static Pressure Measurement Methods
- Manometers are used to measure static pressures
- Manometers can be classified as the following:
- Simple U-tube Manometer
- Industrial U-Tube Manometer
- Cistern Manometer
- Two-liquid U-Tube Manometer
- Inclined Manometer
- The ring balance
- Diaphragms and bellows: Single diaphragm, diaphragm stack, metallic capsule, metallic bellows
The Simple U-tube Manometer
- Consists of a U-shaped glass tube containing liquid
- Two liquid U-tube manometer: p1 - p2 = g h 𝜌2 - 𝜌1
Applications of Two-liquid U-tube manometer
- Measurement of Small Pressure Differences in Low-Pressure Systems: used in labs, research settings, air measurement systems to measure small pressure differences
- Gas and Airflow Measurement in HVAC Systems: used for monitoring airflow in ventilation ducts and filters, provides precision
- Differential Pressure Measurement for Low-Density Gases: used in fuel cells, controlled gas supply systems to measure differential pressures in gases with low density
- Industrial Processes Requiring High Sensitivity: used in chemical and pharmaceutical industries where sensitive reactions or materials are used
The Ring Balance Manometer
- P1 = P2, P1 > P2
- When there is a pressure difference, a rotating moment is setup
The Inclined Tube Manometer
- Increase in accuracy due to the increased length of the scale
- p1 - p2 = 𝜌𝑔 ℎ1 + ℎ
- ℎ = 𝑑 sin 𝛼
- ℎ1 = 𝐴2/𝐴1 ⋅𝑑
- p1 - p2 = 𝜌𝑔𝑑 𝐴2/𝐴1 + sin 𝛼
- If A1>>A2: p1 - p2 = 𝜌𝑔𝑑 ⋅ sin 𝛼 = 𝜌𝑔ℎ
- Sensitivity of the inclined tube manometer is given by: 𝑆𝑖𝑛𝑐. = 𝑑/ℎ.
Metallic Capsule
- Used in capsule gauges
- Common shapes of diaphragms: Dished, Flat, and c
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Description
This quiz covers the fundamental concepts of pressure measurement, including the definitions, types of pressure, and methods for measuring static pressure. You will learn about different types of manometers and their classifications. Test your understanding of pressure equations and measurement principles.
