# Instrumentation Transducers Questions and Answers – Performance Characteristics of Transducers

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This set of Instrumentation Transducers Interview Questions and Answers focuses on “Performance Characteristics of Transducers”.

1. Closeness of measured value to true value is _________________
a) Accuracy
b) Precision
c) Correction
d) Uncertainty

Explanation: Accuracy of a measurement is defined by closeness of a measured value to true value.

2. _______________ of a measuring system refers to its ability to follow instant by instant the measurand with time.
a) Bandwidth
b) Fidelity
c) Measurement lag
d) Settling time

Explanation: Fidelity of a measuring system or transducer refers to its ability to follow instant by instant the variations of measurand with time.

3. For a measuring system, dynamic sensitivity is required to be ________ of static sensitivity.
a) ±2%
b) ±5%
c) ±10%
d) ±20%

Explanation: For a measuring system, tolerated variation of dynamic sensitivity is only ±2% of static sensitivity. That is dynamic sensitivity should be minimum.

4. What is the span of an instrument, operating under a bias which read a value from 230V to 450V only?
a) 450
b) 220
c) 230
d) 400

Explanation: Span of an instrument is the difference between upper and lower calibrated values. Hence, span in this case is 450 – 230 = 220.

5. Given input out characteristic of a typical system, name the region marked as ‘a’. b) Range
c) Drift region
d) Threshold

Explanation: Dead zone is the region in which output starts responding to input. It is marked as region a, below which there is no output for input.
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6. What will be the ratio of amplitudes of largest (maximum) signal to smallest (minimum) signal to which the system is subjected?
a) Time constant
b) Settling period
c) Dynamic range
d) Bandwidth

Explanation: Ratio of amplitude of a large signal to small signal is termed as a dynamic range of the system.

7. For a Measurement, indicated value is 225V while true value if 226V. What will be the static error of an instrument?
a) 1V
b) -1V
c) 0.5V
d) -0.5V

Explanation: Static error is the difference between a measured value and true value of a measurement. Here measured value is 225V while true value is 226V.

8. What is the relation between static error and static correction?
a) Static error is negative of static correction
b) Both are equal
c) No relation
d) Both will be always positive

Explanation: From the definition of static correction and static error, it is clear they both are negative to each other.
Static correction = (true value – indicated value) = – (static error).

9. What is the term used to express the ability of a measuring system to maintain its standard performance?
a) Zero stability
b) Stability
c) Sensitivity
d) Linearity

Explanation: Stability of a system is defined as the ability to maintain its standard performance over prolonged time. Transducers and systems with high stability need not be calibrated.

10. What is ‘live zero’?
a) Output zero for zero input
b) Output non zero for zero input
c) Output null for all input
d) Output unpredictable

Explanation: Live zero is a term used to describe a system in which output has a nonzero value for zero input.

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