Instrumentation Transducers

Piezo Electric Transducers

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which of the following can be used conveniently at 1000c temperature?
Rochelle salt
ADP
Both ADP and Rochelle salt
None of the mentioned
Explanation:
Rochelle salt is suitable for operation at room temperature only while ADP (Ammonium dihydrogen Phosphate) can be used up to temperature 1000c.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following type transducers are used in IC engines?
Monomorph
Dimorph
Multimorph
All of the mentioned
Explanation:
Multimorphes are the combination of more than two transducers, it is suitable in IC engines where pressure variations occur at high frequencies up to 20 KHz.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Who invented the piezoelectric effect?
Mary Elizabeth Barber
Christian Doppler
Marie curie and Pierre curie
Pierre curie and Jacques curie
Explanation:
Piezoelectric effect was first invented and explained by curie brothers, Pierre curie and Jacques curie in 1980.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Process of physical deformation on application of electric field is described by ___________
Electromagnetic property
Electro mechanical property
Magnetostriction property
Electrostriction property
Explanation:
Electrostriction property is defined by physical deformation of certain materials on the application of electrical field.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
__________ are also known as piezopile.
Monomorph
Dimorph
Multimorph
None of the mentioned
Explanation:
Multimorphes are combination of more than two transducers are also known as piezopile.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which of the following quantities cannot be measured using piezoelectric transducers?
Pressure
Strain
Acceleration
None of the mentioned
Explanation:
Piezoelectric transducers can be used to measure a wide range of quantities like pressure, acceleration, strain displacement etc.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which of the following represents piezoelectric materials?
ADP
Quartz
Bernilite
All of the mentioned
Explanation:
Quartz, ADP (Ammonium dihydrogen Phosphate), and bernilite are examples of piezoelectric materials.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
In piezoelectric strain transducer voltage developed is _______________ to strain applied.
Directly proportional
Inversely proportional
Equal
Independent
Explanation:
For a piezoelectric strain transducer, as the strain applied increases output voltage also increases.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Property of exhibiting electric polarization when exposed to intense electric field is known as ___________
Electromagnetic effect
Ferromagnetic material
Ferroelectric materials
Piezoelectric materials
Explanation:
Piezoelectric and Ferroelectric materials are closely related and they produce electric polarization when exposed to an intense electric field.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Piezoelectric accelerometer requires damping system.
True
False
Explanation:
Since natural frequency of piezoelements are so high and far removed from range of frequencies normally required of accelerometers they don’t need damping systems.