Piezoelectric Transducer MCQs with Answers: Following Multiple Choice Questions (MCQs) are based on “Piezoelectric Transducers” also known as “Piezoelectric Sensors“. It is related to subject Instrumentation or Industrial Measurement and Applications.
This topic is mostly beneficial in the field of Instrumentation, Electronics, Electrical and Mechanical Engineering.
These MCQs will be useful in various competitive examinations, entrance examinations, oral examination (Viva voce), certifications and interviews.
MCQ on Piezoelectric Transducer
Que.1 A piezoelectric transducer is a passive transducer.
- True
- False
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Option 2: False
Explanation: The piezoelectric transducers generates voltage when pressure is applied on it, hence it is an active transducer.Que.2 The piezoelectric materials used for converting energy are called as ______.
- converters
- Actuators
- Dielectric
- Transducer
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Option 4: Transducer
Que.3 Piezoelectric transducer consists of _________.
- copper wire
- aluminum wire
- Intrinsic Silicon crystal
- quartz crystal
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Option 4: quartz crystal
Que.4 A piezoelectric transducer is a device that uses the piezoelectric effect to measure changes in
(i) acceleration,
(ii) pressure,
(iii) force
- Only (i) and (ii)
- All of the above
- Only (ii) and (iii)
- Only (i) and (iii)
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Option 2: All of the above
Que.5 The piezoelectric effect states that when mechanical stress or forces are applied on quartz crystal,
- produce electrical charges on the quartz crystal surface.
- neutralize charges from quartz crystal.
- temperature of quartz crystal increases.
- temperature of quartz crystal decreases.
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Option 1: produce electrical charges on the quartz crystal surface.
Que.6 Piezoelectric crystals are electrically_____.
positive
negative
neutral
charged
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Option 3: neutral
Que.7 Which of the following is not a piezoelectric material?
- Lead zirconate titanate (PZT).
- Rochelle salt.
- Sodium Nitrate
- Barium Titanate.
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Option 3: Sodium Nitrate
Que.8 Which of the following is not a disadvantage in Piezoelectric transducer?
- It is very difficult to give the desired shape to this material and also desired strength
- The output is low so some external circuit is attached to it.
- External voltage is required to produce output.
- It is affected by temperatures.
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Option 3: External voltage is required to produce output.
Explanation:Piezoelectric transducers are active transducers which do not require any External voltage to produce output.
One more disadvantage of Piezoelectric transducer is, it is not suitable for static condition.
Que.9 Identify the incorrect statement.
Piezoelectric transducer _____ .
- does not require any external power supply.
- is easy to handle and use as it has small dimensions.
- has low frequency response.
- affected by temperatures.
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Option 3: Piezoelectric transducer has low frequency response.
Explanation: Piezoelectric transducers have high frequency response that is they have fast response.Advantages of piezoelectric transducers.
No need for an external force
Easy to handle and use as it has small dimensions
High-frequency response it means the parameters change very rapidly
Que.10 Identify the correct statement about quartz material.
i. The rate of charge produced will be inversely proportional to the rate of change of mechanical stress applied to it.
ii. If quartz crystal becomes longer due to the electric field applied, it becomes shorter due to the electric field applied in a reversed direction.
- Only statement (i) is correct.
- Only statement (ii) is correct.
- Both statements are correct.
- Both statements are wrong.
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Option 2: Only statement (ii) is correct.
Explanation: The rate of charge produced will be directly proportional to the rate of change of mechanical stress applied to it.More stress means more output voltage.
Que.11 Which of the following is not application of Piezoelectric transducer?
- In microphones, the sound pressure is converted into an electric signal
- Electric lighter used in kitchens
- Automobile seat belts lock in response to a rapid braking is also done using a piezoelectric material
- In optical pyrometer
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Option 4: In optical pyrometer
Que.12 The faces of piezoelectric materials are coated with _____ while using as transducers
- Aluminium
- Platinum
- Silver
- Rubber
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Option 1: Aluminium
Que.13 A piezoelectric transducer has a _________.
- zero sensitivity
- very high sensitivity
- low sensitivity
- high sensitivity
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