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Higher Study | Sensors and Industrial Instrumentation

Measurement of Temperature
Which of the following represent active transducer?
A car falls from a mountain road and comes to the ground in 0.8 seconds. (Let's say g = 10 ms-2). What will be its speed when it hits the ground?
Which of the following transducers produces an electric signal, when the pressure is applied?
When the reading of a pH meter changes from 5 to 7, the hydrogen ion concentration of the solution is:
What happens when heat is applied to the joined ends of wires of thermocouple?
A thermocouple has low response time when
Consider the following statements related to piezoelectric effect: 1. It gives electrical response in terms of voltage change when mechanical stress occurs in some materials. 2. It gives mechanical response in terms of dimensional change due to electrical excitation of some materials. Which of the above statements is/are correct?
What happened when a heat is applied to the joined ends of the wires of a thermocouple
What are the salient features of thermistors? 1. They are compact, rugged and inexpensive 2. They have good stability when properly aged 3. The response time of thermistors can vary from a fraction of a second to minutes, depending on the size of the detecting mass and thermal capacity of the thermistor
A well of cross-sectional area aw is connected to an inclined tube of cross-sectional area at to form a differential pressure gauge as shown in the figure below. When p1 = p2 the common liquid level is denoted by A. When p1 > p2, the liquid level in the well is depressed to B, and the level in the tube rises by l along its length such that difference in the tube and well levels is hd. The angle of inclination θ of the tube with the horizontal is
What is produced when a thermo-junction is heated?
A J-type thermocouple has an output voltage Vθ = (13650 + 50 θx) μV, where θx is the junction temperature in Celsius (°C). The thermocouple is used with reference junction compensation, as shown in the figure. The Instrumentation amplifier used has a gain G = 20. If θRef is 1 °C, for an input θx of 100 °C, the output Vo of the instrumentation amplifier in millivolt is
Identify the instrument shown in the figure below:
Identify the name of the instrument shown in the figure.
A thermocouple-based temperature measurement system is shown in the adjoining figure. Relevant thermocouple emf data (in mV) is given below. The cold junction is kept at 0°C. The temperature is 30°C in the other parts of the system. The emf V is measured to be 26.74 mV. Th temperature of the hot liquid is Temp. emf of Chromel- Constantan emf of Copper- Constantan 10°C 0.591 0.391 20°C 1.192 0.789 30°C 1.801 1.196 370°C 26.549 19.027 380°C 27.345 19.638
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