L2

Question 1

Accuracy implies

Answer 1

Precision

Question 2

If a measurement is accurate it must be also

Answer 2

Precise

Question 3

is a quantitative or numerical indication of closeness with which a repeated set of measurements of the same variable agrees with the average of the set of measurement.

Answer 3

Precision of measurement

Question 4

Characteristics that show the performance of an instrument are

Answer 4

Accuracy, sensitivity, precision, resolution etc.

Question 5

It allows users to select the most suitable instrument for specific measuring jobs.

Answer 5

Characteristic of instrument

Question 6

value of the measured variable change very fast.

Answer 6

Dynamic characteristic

Question 7

are required to be considered for the instrument which
measure unvarying process condition.

Answer 7

Static characteristic

Question 8

defined for the instruments which measure quantities which do not vary with time.

Answer 8

Static characteristic

Question 9

value of the measured variable change slowly.

Answer 9

Static characteristic

Question 10

degree of closeness with which an instrument reading approaches the true value
of the quantity being measured.

Answer 10

Accuracy

Question 11

indicates the nearness to the actual/true value of the quantity.

Answer 11

Accuracy

Question 12

ratio of changed in output of an instrument to the change in input

Answer 12

Sensitivity

Question 13

ratio of magnitude of the measured quantity to the magnitude of response

Answer 13

Sensitivity / inverse sensitivity / deflection factor

Question 14

degree of closeness by which a given value can be repeatedly measured

Answer 14

Reproducibility

Question 15

is specified for a period of time

Answer 15

Reproducibility

Question 16

signifies that the given reading that are taken for an input, do not vary with time.

Answer 16

Perfect reproducibility

Question 17

the gradual shift in the indication over a period of time wherein the input variable does
not change.

Answer 17

Drift

Question 18

caused of environment factor like stray electric field, stray magnetic field, thermal e.m.fs, changes in temperature, mechanical vibrations, etc.

Answer 18

Drift

Question 19

3 categories of drift

Answer 19

Zero drift
Span drift / sensitivity drift
Zonal drift

Question 20

the deviation from the true value of the measured variable.

Answer 20

Static error

Question 21

involves comparison of an unknown quantity with an accepted standard quantity.

Answer 21

Static error

Question 22

degree to which an instrument approaches to its expected value is expressed terms of error of measurement.

Answer 22

Static error

Question 23

the largest changes of input quantity for which there is no output.

Answer 23

Dead zone

Question 24

the input that is applied to an instrument may not be sufficient to overcome friction.
It will only respond when it overcomes the friction force.

Answer 24

Dead zone

Question 25

measure of the reproducibility of the measurement that is given a fixed value of variable.

Answer 25

Precision

Question 26

measure of the degree to which successive measurements differ from each other.

Answer 26

Precision

Question 27

the instrument has zero adjustment error, so when we take a readings, the instrument is

Answer 27

Highly precise

Question 28

as the instrument has a zero adjustment error the readings obtained are precise, but they are

Answer 28

Not accurate

Question 29

the smallest measurable input, below which no output change can be identified.

Answer 29

Threshold

Question 30

while specifying *******, manufactures give the first detectable output change.

Answer 30

Threshold

Question 31

defined as the ability of an intrument to reproduce its input linearly

Answer 31

Linearity

Question 32

simply a measure of the maximum deviation of the calibration points from the ideal straight line.

Answer 32

Linearity

Question 33

defined as ______=maximum deviation of o/p from idealized straight line / actual readings.

Answer 33

Linearity

Question 34

most instruments are specified to function over a particular range and the instruments can be said to be linear when incremental changes in the input and output are constant over the specified range.

Answer 34

Linearity

Question 35

the ability of an instrument to retain its performance throughout its specified storage life and operating life is called as *******.

Answer 35

Stability

Question 36

the minimum and maximum values of a quantity for which an instrument is designed to measure is called its ***** or *****.

Answer 36

Range or span

Question 37

sometimes the accuracy is specified interms of ***** or ***** of an instrument

Answer 37

Range or span

Question 38

the constant error which exist over the full range of measurement of an instrument.

Answer 38

Bais

Question 39

can be completely eliminated by calibration.

Answer 39

Bais

Question 40

the zero error is an example of **** which can be removed by calibration.

Answer 40

Bais

Question 41

the maximum allowable error that is specified in terms of certain value while measurement.

Answer 41

Tolerance

Question 42

specifies the maximum allowable deviation of a manufactured device from a mentioned value.

Answer 42

Tolerance

Question 43

is a phenomena which depicts different output effects while loading and unloading.

Answer 43

Hysteresis

Question 44

takes place due to the fact that all the energy put into the stressed parts when loading is not recovable while unloading.

Answer 44

Hysteresis

Question 45

when the input of an instrument is varied from zero to its full scale value and then if the input is decreased from its full scale value to zero, the output varies.

Answer 45

Hysteresis

Question 46

the output at the particular input while decreasing and increasing varies because of

Answer 46

Internal friction / hysteric damping

Question 47

the output at the particular input while decreasing and increasing varies because of

Answer 47

Internal friction / hysteric damping

Question 48

instrumens rarely respond to instantaneous changes in the measured variables, their response is slow or sluggish due to mass, thermal capacitance, electrical capacitance, inductance, etc. sometimes, even the instruments has to wait for some time till the response occurs

Answer 48

Dynamic characteristic

Question 49

these types of instruments are normally used for the measurement of quantities that flactuate with time

Answer 49

Dynamic characteristic

Question 50

the behaviour of such system, where as the input varies from instant to instant, the output also varies from instant to instant is called as _____ _____ of the system.

Answer 50

Dynamic response

Question 51

defined as that part of the response which goes zero as the time becomes large.

Answer 51

Transient response

Question 52

is the response that has definite periodic cycle.

Answer 52

Steady state periodic/ response

Question 53

the input that is subjected to a finite and instantaneous change

Answer 53

Step input

Question 54

the input linearly changes with respect to time.

Answer 54

Ramp input

Question 55

input varies to the square of time. This represent constant acceleration.

Answer 55

Parabolic input

Question 56

input changes in accordance with a _______ function of constant amplitude.

Answer 56

Sinusoidal input

Question 57

defined as the rapidity with which an instrument, responds to the changes in the measured quantity.

Answer 57

Speed of response

Question 58

shows how fast and active the system is.

Answer 58

Speed of response

Question 59

defined as the degree to which a measurement system is capable of faithfully reproducing the changes in input, without any dynamic error.

Answer 59

Fidelity

Question 60

every system requires its own time to respond to the changes in input.

Answer 60

Lag

Question 61

defined as the retardation or delay, in the response of a system to the changes in input

Answer 61

Lag

Question 62

as soon as there is a changes in the measured quantity, the measurement system begins to respond.

Answer 62

Retardation lag

Question 63

the response of the measurement system starts after a dead time, once the input is applied, They caused dynamic error.

Answer 63

Time delay

Question 64

the difference between the true value of the quantity that is to be measured, changing with time and the measured value, if no static error is assumed.

Answer 64

Dynamic error

Question 65

the difference between the true value of the quantity that is to be measured, changing with time and the measured value, if no static error is assumed.

Answer 65

Dynamic error