1. Define: Transducer
A transducer is defined as a device that receives energy from
one system and transmits it to another, often is a different form.
2. Write the parameters of electrical
The parameters of electrical transducer are:
3. List the advantages of electrical
The advantages of electrical transducers are:
amplification and attenuation can be easily done.
ii. Mass-interia effects
iii. Effects of friction
iv. Using very small power
iv. Electrical output can
be easily used, transmitted and processed for the purpose of measurement.
v. The output can be
indicated and recorded remotely at a distance from the sensing medium.
Viscosity is defined as the property which determine the
magnitudes of the resistance of the fluid to a shearing force.
5. Give the types of potentiometer.
The types of potentiometer are:
6. Give the limitations of
Limitations of thermistor are:
i. Non-linearity in
resistance Vs temperature characteristics.
ii. Unsuitable for wide temperature range.
iii. Very low excitation
current to avoid self-heating.
iv. Need of shielded power
lines, filters etc., due to high resistance.
what principles,inductive transducer works?
i. Variation of
ii. Variation of
a short notes on LVDT.
LVDT(Linear Variable Differential Transformer) converts the
mechanical energy into differential electrical energy. It has single primary
winding, and two secondary windings wound on a hollow cylindrical former. An
movable soft iron core slides within the hollow former and therefore affects
the magnetic coupling between the primary and the two secondaries.
the advantages of LVDT.
The advantages of LVDT are:
i. High range of
ii. Friction and
iii. Immunity from
iv. High input and high
vi. Low hysteresis and low
the limitations of LVDT.
The limitations of LVDT are:
i. Large displacements are required for appreciable differential
ii. They are sensitive to
stray magnetic fields.
iii. Dynamic response is
iv. Temperature also
affects the transducer.
11. List the two physical parameters
in strain gauge.
The two physical parameters in strain gauge are:
i. The change in gauge
ii. The change is length.
12. List out the features of
The features of piezo-electric accelerometer are:
i. Instrument is quite
small in size and has a low weight.
ii. The natural frequency is very high.
iii. Useful for high input frequencies and the response is poor
at low frequencies.
iv. The crystal is a
source with a high output impedance and in order to avoid loading effect, a
voltage monitoring source of a high input impedance should be used.
Inductive transducer is defined as a device that converts
physical motion into a change in inductance. It may be either of active or passive
14. Give the principle of capacitive
Capacitive transducer principle is a linear change in
capacitance with changes in the physical position of the moving element may be
used to provide an electrical indication of the elements position.
Where K= dielectric constant.
A= total area of capacitor surfaces.
d = distance between two capacitive surfaces.
15. What is meant by digital
Digital transducers are also called as encoders. They are
normally in the form of linear or rotary displacement transducers. Hence they
require analog to digital converter to realize the digital data.
16. Classify digital transducers.
Digital transducers are classified into,
i. Tachometer transducers ii. Incremental transducers iii. Absolute