Assertion (A) : Normally, some standard signal conditioner and display devices are used with a transducer, unless they are custom-built to suit the requirements of the transducers. Reason (R) : A transducer is a device which receives energy in one form and transfer it to a convenient form. Select your answer using the codes given below :
Both (A) and (R) are true, but (R) is not the correct explanation of (A)
Both statements are true, but the reason is a definition rather than an explanation, so the code is 2.
Why (A) is true. A transducer's raw output is almost never in a form a display can use directly:
| Transducer | Raw output | Conditioning needed |
|---|---|---|
| Thermocouple | Tens of μV | High-gain amplifier, cold-junction compensation |
| Strain gauge | Fractional ΔR/R | Bridge, instrumentation amplifier |
| RTD | Resistance change | Excitation current, linearisation |
| Piezoelectric | Charge | Charge amplifier |
Signal conditioning therefore covers amplification, filtering, linearisation, isolation and conversion to a standard transmission form — classically the 4 to 20 mA current loop, which is immune to voltage drop along the cable and whose non-zero minimum distinguishes a genuine zero reading from a broken wire. Standardising on such an interface is exactly what lets an off-the-shelf indicator work with any sensor, and custom electronics are built only when no standard interface fits.
Why (R) is true. The definition is correct: a transducer converts energy from one form to another — temperature, pressure, displacement or light into an electrical quantity in the usual case, and the reverse for an output transducer such as a loudspeaker or an actuator.
But the definition does not explain the practice. Knowing what a transducer is tells us nothing about why standard conditioners are preferred to custom-built ones. That preference rests on economics and interchangeability — standard modules are cheaper, replaceable and interoperable — and on the fact that most sensor outputs, though weak and awkward, can be brought to a common form. The reason would explain the assertion only if it said something like "because transducer outputs are weak and vary widely in form", which it does not. So the two statements stand independently.
The answer is flagged for confirmation because a lenient reading — "energy is converted, therefore some conversion electronics are needed" — would make (R) explanatory.
The full measurement chain is worth having in mind: transducer → signal conditioner → transmission → display or recorder → controller. Each block has its own standards, and it is precisely that modularity which allows a thermocouple and a pressure sensor to feed the same panel meter.
Hence, both (A) and (R) are true, but (R) is not the correct explanation of (A).
Similar Questions
Which of the following statements are correct ?
A. Hygrometer measures the value of humidity directly
B. Hygrometer measures the value of humidity indirectly
C. Wien's bridge is used to measure the frequency of the signal
D. Wien's bridge is used to measure the amplitude of the signal
E. Bimetallic strip is a thermal expansion detector.
Choose the most appropriate answer from the options given below :
Which of the following statements are correct
A. Megnetostrictive transducer operation depends on the change of permeability of magnetic material is when strained.
B. Potentiometer is an active transducer.
C. Turbine flow meters are volumetric flow meters
D. Any metal can be thermistor.
E. Thermocouples are used in high accuracy measurements.
Choose the most appropriate answer from the options given below :
Match List I with List II
LIST I LIST II A. Stroboscope I. Changes its electrical resistance with temperature B. Bolometer II. Generate thermoelectric emf C. Thermocouple III. Changes pressure to displacement D. Diaphragm IV. For measurement of rotary motion Choose the correct answer from the options given below:
Match the following lists :
List – I List – II a. Electromechanical Device i. Seismic Device b. Optical Device ii. Piezo-electric c. Gyroscopic device iii. Interferometers d. Absolute motion device iv. Aerospace vehicle Choose the correct answer from the codes given below:
Consider the following transducers or transducer systems :
(a) Float elements
(b) Seismic system
(c) Gyroscope
Arrange the above transducers/systems in decreasing order of the availability of possible number of output signals.
Consider the following statements associated with electrical and electronic transducers
A. Little power is consumed by transducer
B. Mass intertia effects are not minimized
C. The response time is small
D. Transmission and processing the signal for the purpose of measurement are easier.
Choose the correct answer from the options given below:
Match List I with List II
LIST I LIST II A. Relative error I. The ability of tde device to give identical O/P when repeated measurements are made witd tde same I/P signal B. Precision II. The ratio of difference between measured value and tde true value to tde true value of tde measurand C. Caliberation III. The smallest increment in measure tdat can be detected witd certainity by tde instrument D. Resolution IV. The process of making adjustments or tde scale so tdat tde instrument reading conform to an accepted standard. Choose the correct answer from the options given below:
The fundamental law that is used in temperature measurement is known as
Which of the following transducers are not linear ?
i. thermistor
ii. thermocouple
iii. IC sensorWhich of the following sensors has excellent linearity ?
Important Questions from Basics of Transducers
Which of the following can act as an inverse transducer?
For transducers, following statements are given:
(A) An optical interferometer is useful for measuring extremely small motions
(B) The damping ratio of a seismic instrument should be low for good dynamic performance
(C) A rate gyro is a relative motion measuring device
(D) A pneumatic motion transducer is non-linear over a wide range of motion
(E) A piezoelectric accelerometer can only be used for static motion measurement
Choose the correct answer from the options given below:
Choose the INCORRECT statement with respect to the use of electrical transducers.
Consider the following transducers:
1. LVDT
2. Piezoelectric
3. Thermocouple
4. Photovoltaic cell
5. Strain gauge
Which of these are active transducers?
Under which condition, Transducers must operate?
