# Electrical Measurements Questions and Answers – Pressure Sensor

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Pressure Sensor”.

1. Pressure is the _________
a) force per unit area
b) mass per unit area
c) force per unit volume
d) mass per unit volume

Explanation: Pressure at a point is defined as the force acting per unit area. It is measured at some given point over a surface.

2. Pressure measurement devices make use of ________
a) non-elastic member
b) elastic member
c) bendable member
d) non-bendable member

Explanation: Pressure sensors employ elastic member at the input stage to detect or sense the pressure variations. Elastic members are usually of various forms and convert the pressure into mechanical displacement.

3. Output of electrical transducer is ________
a) inversely proportional to displacement
b) proportional to square of displacement
c) proportional to displacement
d) constant

Explanation: The output of an electrical transducer is proportional to displacement. Displacement is measured using electrical transducers.

4. In general how many pressure sensitive devices are there?
a) 6
b) 20
c) 10
d) 4

Explanation: Usually there are four pressure sensitive devices. They are as follows:
• Diaphragms
• Capsule
• Bourdon tube
• Bellows.

5. Diaphragms in a pressure sensor are of ________
a) 2 types
b) 5 types
c) 10 types
d) 20 types

Explanation: Generally in a pressure sensor we have four pressure sensitive devices. Diaphragm is a type of a pressure sensitive device. They are of two types:
• Flat type
• Corrugated type.
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6. Temperature is the only consideration while selecting a diaphragm.
a) True
b) False

Explanation: While selecting a suitable diaphragm for sensing the pressure the following factors are considered important.
• Temperature range
• Shock and vibration
• Frequency response requirements.

7. Capsule type of pressure sensor consists of ________
a) 6 dissimilar diaphragms
b) 4 identical diaphragms
c) 2 identical diaphragms
d) 8 dissimilar diaphragms

Explanation: Capsule is a type of a pressure sensor. It comprises of two identical annular corrugated metal diaphragms that are sealed together to form a shell like enclosure.

8. Bourdon tubes are ________
a) very highly sensitive to shock
b) not sensitive to shock
c) less sensitive to shock
d) more sensitive to shock

Explanation: Bourdon tube is one type of pressure sensor. It is more sensitive to shock and vibrations as compared to diaphragms. Bourdon tube can be used for precision measurements of pressure up to 3 MN/m2.

9. Bellows have 5 to 20 convolutions.
a) True
b) False

Explanation: Bellow is a type of pressure sensor. They have about 5 to 20 convolutions. The number of convolutions depends on the pressure range, displacement, and operating temperature.

10. Sensitivity in a capsule is increased ________
a) through parallel connection of capsules
b) through series connection of capsules
c) through series and parallel connection of capsules
d) by not connecting them at all

Explanation: Capsule is a type of pressure sensor. In a capsule, we can increase the sensitivity by connecting two or more capsules in series. The resultant displacement is equal to the number of capsules.

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