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 transducers are not linear ?
i. thermistor
ii. thermocouple
iii. IC sensorWhich of the following sensors has excellent linearity ?
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:
Incorrect statements regarding measurement are given :
A. Hot wire anemometer is used to measure displacement
B. Hall effect is used to measure current
C. LVDT is used to measure acceleration and gas flow
D. Piezoelectric Transducer is used to measure acceleration
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:
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.
The fundamental law that is used in temperature measurement is known as
The mechanical elements that are used to convert the applied force into a displacement are called :
A device used to convert a non-electrical quantity into an electrical signal is called :
Important Questions from Basics of Transducers
_____ converts mechanical displacement into electrical signals.
Which of the following transducers are not linear ?
i. thermistor
ii. thermocouple
iii. IC sensorWhich of the following sensors has excellent linearity ?
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:
Incorrect statements regarding measurement are given :
A. Hot wire anemometer is used to measure displacement
B. Hall effect is used to measure current
C. LVDT is used to measure acceleration and gas flow
D. Piezoelectric Transducer is used to measure acceleration
Choose the correct answer from the options given below:
