# Instrumentation Transducers Questions and Answers – Density Measurement

This set of Instrumentation Transducers Assessment Questions and Answers focuses on “Density Measurement”.

1. Which of the following is represented by a ratio of density of substance to density of water at 400c?
a) Specific gravity
b) Mass density
c) Weight density
d) Specific density

Explanation: Specific gravity is the ratio of density of that substance to density of water at 400c.

2. In air bubbler system, air pressure is measured.
a) True
b) False

Explanation: In air bubbler system, air pressure is measured using air bubbles in measuring liquid.

3. Which of the following cannot be used for density measurement?
a) Hydrometer system
b) Pitot-static device
c) Air bubbler system
d) U-tube system

Explanation: Pitot-static device are used for flow measurement, all other devices are used for density measurement.

4. Which of the following device doesn’t uses storage of liquid?
a) Manometer system
b) Hydrometer system
c) U-tube system
d) Air bubbler system

Explanation: In U-tube system, density of the liquid is measured by allowing liquid to flow through. It doesn’t require storage of liquid under measurement.

5. Manometer system cannot be used for measuring density.
a) True
b) False

Explanation: Manometer system can be used for measuring the density of liquid also.
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6. Which of the following represents the correct relationship of density and length of column?
a) Direct proportionality
b) Inverse proportionality
c) Equal
d) None of the mentioned

Explanation: Correct relation explaining it is ΔP=hϱg, where density becomes inversely portioned to length.

7. Which of the following represents relation for a pressure change in a column?
a) hϱg
b) hϱ
c) hg
d) n one of the mentioned

Explanation: Product of density, acceleration due to gravity and length of the column represents pressure difference in column.

8. ____________ can be used for measuring density.
b) pH meter
c) Pitot static device
d) Mutimeter

Explanation: For density measurement, load cell can also be used. It employs an indication of density in terms of force.

9. Which of the following is used to represent mass per unit volume of a substance?
a) Mass density
b) Weight density
c) Specific density
d) None of the mentioned

Explanation: Mass density of a substance is the mass per unit volume of the substance.

10. Specific volume of all substances depends on ______________
a) Temperature only
b) Pressure only
c) Both temperature and pressure
d) Temperature and pressure for some

Explanation: For compressible fluids, specific volume depends on temperature and pressure, for all other substances specific volume depends on temperature only.

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