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.
(b), (c), (a)
The question asks how many distinct quantities each device can be made to deliver.
(b) Seismic system — the most. A spring-mounted mass inside a case is a genuinely versatile instrument, because which quantity it reports depends on where its natural frequency sits relative to the motion being measured:
| Operating region | Output represents |
|---|---|
| ω ≫ ωn | displacement (vibrometer) |
| ω ≈ ωn | velocity (with suitable damping) |
| ω ≪ ωn | acceleration (accelerometer) |
One mechanical arrangement, three different measurands — and it needs no external reference, since the inertia of its own mass provides one.
(c) Gyroscope — fewer. A spinning rotor gives an inertial reference direction, from which angular displacement and angular rate can be derived, and with three axes it supplies attitude information in roll, pitch and yaw. So it offers more than one output, but they are all angular quantities — a narrower set than the seismic instrument's displacement, velocity and acceleration.
(a) Float element — fewest. A float rides on a liquid surface and its position follows the level. It measures essentially one thing: liquid level (from which volume follows trivially for a known tank shape). Simple, cheap and robust — but a single-purpose device.
Decreasing order: (b), (c), (a).
The principle behind the ranking. The versatility of a transducer depends on how many independent physical effects it can be arranged to sense. A device with an internal dynamic system — a mass and spring, or a spinning rotor — has frequency-dependent behaviour that can be exploited in several regimes, whereas a purely geometric element such as a float has only one mode of operation.
Hence, the decreasing order is (b), (c), (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 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
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 :
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?
