Which of the following are methods of measurements
a. Direct and optional b. Direct and indirect c. Dimensions and calibration d. Scale and basic
Direct and indirect methods
Primary standard is?
a. Base or derived unit b. Prototyped and vacant c. Measurement by the laboratory d. Normal standards
Base or derived unit
Which of these is a dimension of power?
a. LT-1 b. MLT-2 c. ML2T3 d. ML2T-3
ML2T-3
All of the following are calibration methods except
a. Primary calibration b. Indirect calibration c. Special calibration d. Routine calibration
Special calibration
Which of the following is not class of an instrument?
a. Analog instrument b.Computer instrument c. Absolute instrument d. Mechanical instrument
Computer Instrument
An example of measurement system with elements is
a. Primary sensing element b.Secondary sensing element c. Tertiary sensing element d. Working sensing element
Primary sensing elements
Transducers are classified into
a. Digital and analog b. Analog and passive c. Passive and analog d. Active and passive
Active and Passive.
The Kline and McClintock formula for estimating uncertainty is
Increase the area of the path
The resistance of a certain copper wire is given as R=Ro[1+α(T-20)], where Ro= 12Ω±0.6 percent is the resistance at 20°C, α = 0.008C-1±2 percent is the temperature coefficient of resistance, and the temperature of the wire is T=60±2 0C. The nominal resistance of the wire is
a. 24.98 ohm b. 15.84 ohm c. 12ohm 18.68 ohm
R=Ro [1+∝(T-20)]=12[1+0.008(60-20)]=15.84
The Uncertainty is,
∂R/(∂Ro )=1+∝(T-20)=1+0.008(60-20)=1.32
∂R/(∂∝)=Ro (T-20)=12(60-20)=480
∂R/∂T =Ro ∝=12(0.008)=0.096
WRo=12(0.006)=0.072
W∝=0.008×2%=0.00016
WT=2℃
WR=[(1.32)2 (0.072)2+(480)2 (0.00016)2+(0.096)2 (2)2 ] =4.02Ω = 25.4%
The total area under the probability density curve is
a. 0.5 b. 0 c. 1 d. 2
The total area is unity 1
Smaller value of standard deviation produces?
a. Maximum value of probability density b. Minimum value of probability density
c. Zero value of probability density d. None of the above
Maximum value of probability density
A correlation coefficient of zero indicates
a. Good fit b. Poor fit c. Fair fit d. Bad fit
Bad fit (no relationship between the variables)
A ……………….. is a physical variable used to specify the behavior of a particular system
a. Unit b. Dimension c. Standardizing d. Conversion
Unit
In an instrument the source of random error is
a. Hysteresis b.Backlash c. Friction d. All of the above
All of the above. Hysteresis, Backlash and friction
What does the reliability of an instrument mean
a. The time interval between two responses of the instrument b.The life of the instrument c. The degree of repeatability within specified limits d. None of the above
It is the degree of reliability
The reading value of a measurement instrument is
a. The operator’s interpretation of the indicated size b.The smallest increment which can be read directly from the scale c. The measuring accuracy of the instrument d. Never better than the indicated size
The smallest increment which can be read directly from the scales
The technology of using instrument to measure and control the physical and chemical properties of a material is called
a. Instrumentation b.Measurement c. Measurand d. Quantitative
Instrumentation
What is the function of the intermediate stage of measuring instrument
a.To give a signal that the desired value has been reached b.To condition and transmit the signal after it has been transduced c. to provide a record or indicate of the measurement d. None of the above
To condition and transmit the signal after it has been transduced
The standard to be used for reference purposes in the laboratories and workshop are referred to as
a. Primary standards b.Secondary standards c. Tertiary standard d. Working standards
Secondary standards
The output stage of generalized method of measurement may comprise of a
a. Detector-transducer unit b.Indicating or recording unit c. Transmission element to telemetre the data for remote reading & recording d. Any of the above depending upon the nature & application of measurement
Transmission element to telemeter the data for remote reading and recording.
A set of readings has a wide range and therefore it has
a. Low precision b. low accuracy c. high precision d. High accuracy
Low precision
Error which may be variable both in magnitude and nature (positive or negative) are classified as
a. Hysteresis error b.Random error c. Systematic error d. Interaction error
Systematic error
A natural error in measurement may be due to
a. Temperature b.Wind c. Any of the above d. None of the above
Environmental condition such as temperature, pressure, wind and humidity.
The maximum amount by which the result differs from the true value is called
a.Correction b.Discrepancy c. Error d. Accuracy
Error
The ease with which observation can be made accurately is referred to as
a. Readability b. Sensitivity c. Precision d. Accuracy
Accuracy
The function of transducer is
a. To amplify the input signal b. To modify the input signal c. To codify the input signal d. To convert the primary signal into a more useful quantity usually an electrical impulse
To convert the primary signal into a more useful quantity usually an electrical impulse
Sensitivity and range of measuring instrument have
a. Direct relationship b.linear relationship c. Inverse relationship d. Unpredictive relationship
Linear relationship
One micron is equal to
a. 1mm b.0.1mm c. 0.01mm d. 0.001mm
0.001mm
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