# Biomedical Instrumentation Questions and Answers – Classification of Transducers

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This set of Biomedical Instrumentation Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Transducers”.

1. Which type of transducer requires energy to be put into it in order to translate changes due to the measurand?
a) active transducers
b) passive transducers
c) powered transducers
d) local transducers

Explanation: Passive transducers are transducers that require energy to translate changes due to the measurand. Active transducers convert one form of energy directly into another. For example photovolatic cell in which light energy is converted into electrical energy.

2. Active transducers work on the principle of ________
a) energy conversion
b) mass conversion
c) energy alteration
d) volume conversion

Explanation: Active transducers work on the principle of energy conversion. They convert one form of energy to another. They don’t require any power to operate.

3. Accuracy is ______
a) ability of the transducer or sensor to see small differences in reading
b) ability of the transducer or sensor to see small differences in reading
c) algebraic difference between the indicated value and the true or theoretical value of the measurand
d) total operating range of the transducer

Explanation: Accuracy describes the algebraic difference between the indicated value and the true or theoretical value of the measurand. Resolution is the ability of the transducer or sensor to see small differences in reading. Precision refers to the degree of repeatability of a measurant.
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4. The smallest change in measurant that will result in a measurable change in the transducer output is called _______
a) offset
b) linearity
c) resolution
d) threshold

Explanation: The threshold of the transducer is the smallest change in measurant that will result in a measurable change in the transducer output. Offset is the output that will exist when it should be zero. Linearity shows closeness of a transducer’s calibration curve to a specific straight line with in a given percentage of full scale output.

5. Unwanted signal at the output due either to internal sources or to interference is called ________
a) offset
b) noise
c) drift
d) threshold

Explanation: Noise is the unwanted signal at the output due either to internal sources or to interference. Offset is the output that will exist when it should be zero. The threshold of the transducer is the smallest change in measurant that will result in a measurable change in the transducer output.

6. The ability of the sensor to see small differences in reading is called ______
a) resolution
b) drift
c) offset
d) linearity

Explanation: The ability of the sensor to see small differences in reading is called the resolution of the sensor. Offset is the output that will exist when it should be zero. Linearity shows closeness os a transducer’s calibration curve to a specific straight line with in a given percentage of full scale output.

7. Change is signal over long period of time is called _______
a) noise
b) offset
c) hysteresis
d) drift

Explanation: Drift indicated a change of base line or of sensitivity with time, temperature etc. Drift is basically the change in a signal over long period of time. Noise is the unwanted signal at the output due either to internal sources or to interference. Offset is the output that will exist when it should be zero.

8. Linearity of transducer is ___________
a) Closeness of the transducer’s calibration curve to a special curved line within a given percentage of full scale output
b) Closeness of the transducer’s calibration curve to a special straight line within a given percentage of full scale output
c) Closeness of the transducer’s calibration curve to a special straight line within a given percentage of half scale output
d) Closeness of the transducer’s calibration curve to a special curved within a given percentage of half scale output

Explanation: Linearity of transducer is closeness of the transducer’s calibration curve to a special straight line within a given percentage of full scale output. Basically, it reflects that the output is in some way proportional to the input. A linear sensor produces an output value which is directly proportional to the input.

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