# 250+ TOP MCQs on Classification of Transducers and Answers

Biomedical Instrumentation Multiple Choice Questions 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
Clarification: 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
Clarification: 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
Clarification: 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.

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
Clarification: 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
Clarification: 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
Clarification: 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