WorksheetsQuiz on Measurements and Instruments
Total questions: 50
Worksheet time: 52mins
Measurement is defined as:
Counting of objects
Guessing approximate value
Comparison of an unknown quantity with a known standard
Converting one unit into another
The main significance of measurement in engineering is:
To save money
To ensure accuracy and quality of manufacturing
To increase weight of material
To avoid errors in design
Which of the following is a direct measurement?
Measuring temperature with a thermometer
Measuring diameter using micrometer
Measuring velocity from distance/time
Both (a) and (b)
Indirect measurement involves:
Measuring a quantity directly by a scale
Using another parameter to derive the value
Visual inspection only
Approximating by experience
In a generalized measuring system, which element senses the quantity?
Display device
Transducer
Signal conditioner
Recorder
The current SI definition of 1 metre is based on:
Platinum-Iridium bar
Wavelength of krypton-86 radiation
Distance travelled by light in vacuum in 1/299,792,458 sec
Vernier scale reading
Secondary standards are:
Maintained by international bureaus
Used for routine work in industries
Not traceable to primary standards
Unreliable standards
The most important factor in selecting a measuring instrument is:
Cost only
Accuracy required in measurement
Weight of instrument
Color of instrument
Precision refers to:
Closeness to true value
Closeness of repeated measurements
Ability to detect small changes
Range of instrument
Accuracy is:
Closeness of measured value to true value
Ability to repeat readings
Sensitivity of instrument
Least count of instrument
Sensitivity of an instrument is:
Ratio of output to input
Reciprocal of accuracy
Range of measurement
Threshold value
The property of an instrument to give the same reading for repeated application of same input is:
Accuracy
Precision
Repeatability
Sensitivity
The smallest input value that can be detected by an instrument is:
Threshold
Range
Sensitivity
Accuracy
The total span of measured values that can be handled by an instrument is its:
Sensitivity
Range
Threshold
Hysteresis
The lag between applied input and output in measurement is called:
Error
Sensitivity
Hysteresis
Threshold
Calibration of an instrument means:
Cleaning the instrument
Comparing with standard to maintain accuracy
Repairing defective parts
Checking its repeatability
Which of the following is not a standard classification of error?
Gross error
Systematic error
Random error
Threshold error
Systematic errors may arise due to:
Instrument defects
Environmental changes
Personal bias
All of the above
Random errors are:
Unpredictable and caused by unknown factors
Constant throughout the measurement
Easily corrected by calibration
Caused only by environment
Which type of error can be minimized by taking many readings and averaging?
Systematic error
Random error
Gross error
Environmental error
A thread micrometer is used to measure:
Pitch of thread
Core (minor) diameter
Effective (pitch) diameter
Included angle
A V-anvil micrometer is designed to measure:
Outer diameter of cylinders
Effective diameter of screw threads
Pitch diameter of spur gears
Minor diameter of threads
A bevel protractor is used to measure:
Linear dimensions
Internal diameters
External diameters
Angles accurately
The least count of a vernier bevel protractor is usually:
1°
5′ (minutes)
10′ (minutes)
30′ (minutes)
The principle of sine bar is based on:
Pythagoras theorem
Trigonometry (sin θ = h/L)
Similar triangles
Interpolation method
The standard length of commonly used sine bars is:
100 mm and 200 mm
150 mm and 250 mm
200 mm and 300 mm
300 mm and 500 mm
To measure 45° using a 200 mm sine bar, the slip gauge height required is:
200 mm
141.4 mm
100 mm
70.7 mm
Which of the following is not a linear measuring instrument?
Micrometer
Vernier caliper
Bevel protractor
Steel rule
A plain plug gauge is used to check:
Internal diameter of holes
External diameter of shafts
Thread pitch
Surface finish
A ring gauge is used to check:
Internal diameter of hole
External diameter of shaft
Angle of taper
Surface roughness
A snap gauge is used to check:
Length
Diameter or thickness of shafts quickly
Angular dimensions
Thread pitch
A limit gauge is designed to:
Show actual dimension of workpiece
Check whether dimension lies within tolerance
Measure angle only
Indicate surface roughness
The Go gauge in a limit gauge checks:
Maximum limit of size
Minimum limit of size
Average value
Both maximum and minimum
The No-Go gauge checks:
Minimum size
Maximum size
Angle of taper
Pitch of threads
Gauges used in mass production for quick checking are:
Vernier caliper
Micrometer
Limit gauges
Dial indicator
Which of the following is NOT a limit gauge?
Plug gauge
Ring gauge
Snap gauge
Vernier height gauge
Which measuring device works on principle of optical magnification?
Tool maker's microscope
Vernier caliper
Micrometer
Dial gauge
The instrument best suited for angular alignment of machine tools is:
Sine bar
Vernier bevel protractor
Plug gauge
Ring gauge
In screw thread measurement, the three-wire method is used for:
Minor diameter
Effective (pitch) diameter
Major diameter
Thread angle
The best instrument to measure taper angle of a part is:
Plug gauge
Bevel protractor
Sine bar
Vernier caliper
The calibration of sine bars is done using:
Dial indicator
Slip gauges
Vernier caliper
Optical flat
A double-ended type gauge is:
Ring gauge
Plug gauge
Snap gauge
Vernier caliper
Which gauge checks both maximum and minimum sizes in one go?
Ring gauge
Snap gauge
Bevel protractor
Vernier micrometer
Which is a comparative measuring instrument?
Vernier caliper
Sine bar
Dial indicator
Steel rule
A feeler gauge is used to measure:
Clearance or gap
Diameter
Angle
Surface roughness
The least count of a steel rule is:
0.1 mm
0.5 mm
1 mm
0.01 mm
Which of the following is a non-contact type measuring instrument?
Optical comparator
Vernier caliper
Micrometer
Bevel protractor
Limit gauges are primarily used for:
Actual measurement
Quality control in mass production
Rough estimation
Measurement of angle
Which error is most significant in sine bar measurements?
Thermal expansion of bar
Error in slip gauge height
Error due to misalignment
All of the above
The most suitable instrument to check flatness of a surface is:
Sine bar
Slip gauge
Optical flat
Dial indicator
