Instrumentation Transducers

Measurement and Callibration

Question 1
Marks : +2 | -2
Pass Ratio : 100%
In a measuring system quantity under measurement is termed as ________________
Measurand
Controllers
Sensors
Indicators
Explanation:
Measurand is the value under consideration in a measuring system. For example, while measuring signal voltage, voltage is the measurand.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Given a DC voltmeter has a sensitivity of 500ohm/V. For a full scale reading in 100V range, what will be the current through voltmeter?
500mA
200mA
250mA
300mA
Explanation:
Full scale reading in 100V range means 100V itself. For a sensitivity of 500ohm/V current through it will be the ratio of scale reading and sensitivity. ie, 0.2A=200mA.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Using a voltmeter measured value is 24.3V, while its true value is 24V. What is the relative error of measurement?
1.25%
1.2%
1.3%
1.4%
Explanation:
Relative error = ((measured value-true value)/true value)*100%
Question 4
Marks : +2 | -2
Pass Ratio : 100%
What is the span of an ammeter with range -30 to +30A?
60
-60
30
20
Explanation:
Span of a system is the difference between higher and lower calibrated values. Here span=30-(-30) = 60.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
During a measurement, for a measure value “B”, absolute error is obtained as “A”, what will be the relative error of measurement?
A/B
B/A
(A+1)/B
(B+A)/A
Explanation:
Ratio of absolute error to measured value is called relative error. i.e.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Science of precise and accurate measurement of various physical quantities is termed as ___________
Metrology
Meteorology
Pedology
Mineralogy
Explanation:
Metrology is the science of measurement. Metrology includes all theoretical aspects of measurement. Meteorology is the branch of study about the atmosphere. Pedology is the branch of study about soil and Mineralogy is a branch of geology specializing in chemistry, chemical structure and physical properties of minerals.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Accuracy and Precision are dependent on each other.
True
False
Explanation:
Accuracy is the closeness of a measured value with a standard value. Precision is the closeness of two or more measured values. Hence they are not dependent with each other.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
In a measurement, what is the term used to specify the closeness of two or more measurements?
Precision
Accuracy
Fidelity
Threshold
Explanation:
Closeness of two or more measurements is termed as precision. For example, if two measurements gives 3.1kg as output, then the measurement is said to be more precise.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
______________ is used to prevent oscillation in moving system.
Oscillatory system
Controlling
Damping system
Deflecting
Explanation:
Damping system acts on the damping force. Damping force is necessary in case of moving systems to bring the pointer to rest quickly.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
In a measuring system what is the term used to specify a difference between higher and lower calibration values?
Range
Span
Drift
Threshold
Explanation:
Span is the difference between higher and lower calibration values. For an instrument with a range 100 units to 250 units span are 150 units.