# Instrumentation Transducers Questions and Answers – Liquid Level Measurement

This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Liquid Level Measurement”.

1. Which of the following conversions take place in float element?
a) Level to force
b) Level to voltage
c) Level to displacement
d) None of the mentioned
View Answer

Answer: c
Explanation: Float elements are used for measuring the liquid level of a system. Liquid level indication is obtained using displacement of float element.

2. In ______________ system, float whose weight greater than liquid to be displaced is used.
a) Inverse float system
b) Displacer system
c) Magnifying float system
d) None of the mentioned
View Answer

Answer: b
Explanation: Displacer systems are in which weight of float will be greater than the weight of liquid to be displaced.

3. For float element, uniformity of density is important.
a) True
b) False
View Answer

Answer: b
Explanation: While using the float element, liquid of uniform density distribution is not required. But in the displacer system, liquid with constant density distribution is important.
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4. Which of the following represents pressure of a liquid column with constant density?
a) ϱgh
b) ϱh
c) ϱg
d) None of the mentioned
View Answer

Answer: a
Explanation: In a liquid column with constant density ‘ϱ’, pressure can be represented as a product of density, acceleration due to gravity and height of the liquid column.

5. Which of the following is correct for a level to force conversions?
a) Liquid at constant density distribution
b) Liquid with different density distribution
c) Level difference should be gradual
d) Liquid should be highly viscous
View Answer

Answer: a
Explanation: Liquid used for a level to force conversion should have constant density distribution at all points, it enables consistent measurement of force.
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6. Which of the following devices are used for a level to force conversion?
a) Load cell
b) Membrane
c) Diaphragm
d) Voltmeter
View Answer

Answer: a
Explanation: Load cells are force measuring devices, and they are used for a level to force conversion.

7. Diaphragm element is used for a level to pressure conversion.
a) True
b) False
View Answer

Answer: a
Explanation: Diaphragm elements are used for measuring pressure and they are used for a level to pressure conversion.
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8. In closed container type level measuring system, pressure at top of container is due to ______________
a) Vacuum pressure
b) Vapor pressure
c) Liquid pressure
d) Atmospheric pressure
View Answer

Answer: b
Explanation: Pressure at top of the container in a closed container system is the pressure above liquid level which is the pressure of vapor.

9. What will happen if the float becomes lighter?
a) Density variations becomes more important
b) Density variations becomes less important
c) System becomes less efficient
d) None of the mentioned
View Answer

Answer: b
Explanation: When float made lighter, errors due to density variation decreases.
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10. Which of the following represents correct relation for pressure in manometer type level measuring system?
a) (ϱmhm – ϱy)g
b) (ϱm – ϱy)g
c) (ϱmhm – ϱ)g
d) ϱmhm – ϱy
View Answer

Answer: a
Explanation: (ϱmhm – ϱy)g represents pressure difference in a manometer system for measuring level measuring, where ϱm is the density of manometric liquid and hm is the level of manometric liquid.

Sanfoundry Global Education & Learning Series – Instrumentation Transducers.

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