MQC | ENGINEERING METROLOGY | MCQ's

 

MCQ's ON ENGINEERING METROLOGY

 1. The degree of closeness of the measured value of a certain quantity with its true value is
known as
a. Accuracy 

b. Precision 

c. Standard 

d. Sensitivity

2. Error of measurement =
a. True value – Measured value

 b. Precision – True value
c. Measured value – Precision 

d. None of the above

3. The following is an internationally recognized and accepted unit system
a. MKS

 b. FPS 

c. SI 

d. All of the above

4. The following is a line standard of measurement
a. Measuring tape

 b. Slip gauge

 c. Micrometer 

d. End bars

5. _____ is equal to the differences of the two limits of size of the part
a. Tolerance 

b. Low limit 

c. High limit 

d. Design size

6. To check external diameter of hole, we use

a. Plug gauge 

b. Ring gauge
c. Slip gauge 

d. Standard screw pitch gauge

7. ‘GO’ and ‘NO GO’ gauge is a type of
a. Plug gauge

 b. Slip gauge 

c. Ring gauge 

d. Limit gauge

8. The following is not used to measure angles
a. Bevel protector’s

b. Calibrated levels
c. Clinometers

 d. Optical flats

9. The study of scientific metrology deals with
a. Accuracy and methods of measurement
b. Standard specifications
c. Theories related to nature
d. All of the above

10. Which of the following is not a type of direct measuring instrument?
a. Micrometer

b. Vernier caliper 

c. Divider 

d. All of the above

11. A micrometer screw gauge is precise to ________?
a. 0.005 mm b. 0.1 mm c. 0.05 mm d. 0.01 mm

12. In a micrometer screw gauge, the ratchet is used to
a. Turn the circular scale wrong 

b. Lock the spindle
c. Correct the zero error

 d. Apply the correct pressure

13. When the length is measured as the distance between two parallel lines, this standard is
called _______.
a. Line Standard b. End Standard
c. Wave Standard d. None of these

14. When the distance is measured as a separation of two parallel surfaces, then this is called
_______.
a. Line Standard b. End Standard
c. Wave Standard d. None of these

15. The result of every measurement is denoted in
a. Unit b. Gauge c. Magnitude

16. The maximum amount by which the result differs from the True Value is called ____.
a. Correction b. Discrepancy
c. Error d. Accuracy

17. The number of Slip Gauges in a set are
a. 87

 b. 31

 c. 45 

d. All of these sets are available

18. Circular Scale on the micrometer is marked on
a. Anvil b. Barrel c. Ratched d. Thumble

19. Constant measuring pressure in micrometer is ensured by
a. Lock Nut b. Barrel & Thimble
c. Spindle d. Ratched

20. The Slip Gauge was introduced by __________ engineer.
a. Swedish b. German
c. British d. American

21. The Slip Gauge is example of ________ of length.
a. Line Standard b. End Standard
c. Wave Standard d. None of these

22. For angular measurement, the ________ are used with Sine bar.
a. Slip Gauge b. Calipers
c. Scale d. Micrometer

23. The NPL gauge interferometer is designed & used for
a. Absolute measurement of length of slip gauges.
b. Judging features of surface
c. Comparing height with a standard reference
d. Measurement of fringe displacement.

24. Which of the following is true for uses of comparators?
a) Can’t be used in mass production
b) Not suitable for inspection purposes
c) Can be used as working gauge
d) Slow rate of working

25. From which category ‘Sigma comparator’ belongs?
a) Optical comparator
b) Mechanical comparator
c) Mechanical-optical comparator
d) Pneumatic comparator

26. What is the advantage of mechanical comparator over others?
a) Less moving parts
b) No need of external supply
c) No error due to parallax
d) Large range of instrument

27. Which of the following option is correct regarding characteristics of comparators?
a) Minimum inertia
b) Minimum compensation for temperature effect
c) High measuring pressure
d) Minimum versatility

28. Which of the following is not correct for pneumatic comparator?
a) Independent of operator skill
b) Loss of accuracy due to gauge wear
c) Speedy operation
d) Total life cost is less

29. Which of the following is not correct for pneumatic comparator?
a) Independent of operator skill
b) Loss of accuracy due to gauge wear
c) Speedy operation
d) Total life cost is less

30. In Back pressure type pneumatic gauge, there are two orifices. What is the relationship
between upstream pressure of first orifice and pressure between two orifices?
a) Depends upon the distance between two orifice
b) Depends upon relative size of orifice
c) Only on geometric area of first orifice
d) Distance between pressure source and first orifice

31. Function of transducer is to convert
a. Electrical signal into non electrical quantity
b. Non electrical quantity into electrical signal
c. Electrical signal into mechanical quantity
d. All of these

32. Potentiometer transducers are used for the measurement of
a. Pressure
b. Displacement
c. Humidity
d. Both (a) and (b)

33. Thermistor is a transducer. Its temperature coefficient is
a. Negative
b. Positive
c. Zero
d. None of these

34. The transducer used for the measurements is/are
a. Resistance temperature detectors
b. Thermistors
c. Ultrasonic
d. All of these

35. For the measurement of pressure the instruments used can be
a. Mechanical
b. Electro-mechanical
c. Electronic
d. All of these

36. What is the difference between CMM and UMM?
a) UMM can’t inspect geometrical features while CMM does it
b) CMM is more accurate than UMM but can’t inspect geometrical features
c) UMM is more accurate than CMM and can inspect geometrical features
d) CMM is more accurate than UMM but can’t inspect geometrical features

37. Which type of standard is UMM for calibration of hole location gauges?
a) Primary standard
b) Secondary standard
c) Basic standard
d) Reference standard

38. Which of the following is used to locate awkward shaped work pieces in UMM?
a) Swinging table
b) Tilt table
c) Rotary table
d) Angular table

39. Which of the following is used to measure macro-circuit components in UMM?
a) Telescope
b) Microscope
c) Probe tip
d) Capstan

40. Which of the following are the foundations of mechanical accuracy in UMM?
a) Geometry and length
b) Roundness, geometry and length
c) Geometry, division of circle and length
d) Roundness, geometry, division of circle and length

41. Which of the following option is true for given statements about UMM?
Statement 1: Measurement on CMM is faster than UMM.
Statement 2: UMM can resolve the exact nature of error of features of all parts.
a) T, T b) F, T c) T, F d) F, F

42. Which of the following is not true for UMM?
a) Less skilled operator is needed
b) It is a slow machine
c) Used as a special purpose machine in metrology laboratories
d) A valuable machine for comparing master gauges and length standards

43. Which of the following is a foundation of all geometrical accuracy?
a) Vertical plane
b) Flat plane
c) Rough plane
d) Oblique plane

44. Which of the following instrument is of the highest accuracy?
a) Digital length gauge
b) Inside micrometer
c) Universal measuring instrument
d) Universal height micrometer

45. Which of the following option is incorrect about universal measuring instrument?
a) Twin digital display is present
b) Highly skilled operator is required
c) Computation capabilities
d) Automatically sense diameter of bores

46. What is the permissible measuring speed in universal measuring instrument for error free
reading?
a) 1 m/sec
b) 1 mm/sec
c) 1 cm/sec
d) 2 cm/sec

47. What precise movement does CMM have?
a) Precise movement in x coordinate
b) Precise movement in x and y coordinates
c) Precise movement in y and z coordinates
d) Precise movement in x, y and z coordinates

48. Which type of CMM is most suited for large heavy workpieces?
a) Cantilever type
b) Bridge type
c) Horizontal boring mill type
d) Floating bridge type

49. Which direction is sensed by linear measurement transducer used in CMM?
a) Positive direction only
b) Negative direction only
c) Both positive and negative direction
d) Not used to sense directions

50. What is the accuracy of present day co-ordinate measuring machine?
a) 10 microns
b) 5 microns
c) 2 microns
d) 1 micron

51. Which of the following is caused by careless handling?
a) Systematic error
b) Gross error
c) Random error
d) None of the mentioned

52. ‘A system will be error free if we remove all systematic error’. Is this statement true or
false?
a) True b) False

53. Which of the following is not a fundamental quantity?
a) Length
b) Angle
c) Time
d) Luminous intensity

54. Which of the following error is caused by poor calibration of instrument?
a) Random error
b) Gross error
c) Systematic error
d) Precision error

55. How systematic errors are eliminated?
a) Frequent measurement
b) Replacement of instrument
c) Finding mean of reading
d) Finding variance of reading

56. ‘Zero error is an indication of instrumental error’. Is the statement true or false?
a) True b) False

57. The systematic errors of an instrument can be reduced by making
a. The sensitivity of instrument to environmental input as low as possible
b. The sensitivity of instrument to environmental input as high as possible
c. Systematic errors does not depend on the sensitivity of instrument
d. None of these

58. Suitable method for the reduction of systematic errors is/are
a. Instrument must be designed carefully
b. By introducing an equal and opposite environmental input for compensating the effect
of environmental input in a measurement system
c. By adding high gain feedback to measurement system
d. All of these

59. If the instrument is used in wrong manner while application, then it will results in
a. Systematic error
b. Instrument error
c. Random error
d. Environmental error

60. Random errors in a measurement system are due to
a. Environmental changes
b. Use of uncalibrated instrument
c. Poor cabling practices
d. Unpredictable effects

61. In a measurement system,
a. A single measurement components may have both random errors and systematic errors
b. A measurement system consists of several components with each component having
separate errors
c. Both the statement (a) & (b) are true
d. Neither statement (a) nor statement (b) are true

62. Error that occurs due to equally affected measurements is called
a. random error
b. systematic error
c. frequent error
d. precision

63. Error that occurs during measurement of quantities is
a. random error
b. systematic error
c. frequent error
d. both a and b

64. Systematic error occurred due to poor calibration of instrument that can be corrected by
a. taking several readings
b. replacing instruments
c. taking mean of values
d. taking median of values

65. Who gave the fundamental principle of straightness measurement?
a) Bryan
b) Moire
c) Euler
d) Amedeo

66. Which of the following represents the quality of straightness in precision engineering?
a) Spirit level
b) Straight edge
c) Autocollimator
d) Dial indicator

67. What is the tolerance of the straightness of a line?
a) Maximum deviation from the straight line joining two extremities
b) Maximum deviation from the middle point of straight line joining two extremities
c) Minimum deviation from the straight line joining two extremities
d) Minimum deviation from the middle point of straight line joining two extremities

68. Which of the following is true for measurement of surface roughness?
a) 3 dimensional geometry can be easily measured
b) Direction of measurement is perpendicular to the lay
c) Direction of measurement is parallel to the lay
d) Direction of measurement is parallel to the direction of the predominant surface
marking

69. Which of the following parameter is important for specifying surface roughness?
a) Size of irregularity
b) Spacing of irregularity
c) Height of irregularities
d) Height, spacing and form of irregularities

70. What is meant by roughness?
a) Minute succession of hills of different height
b) Minute succession of valleys and hills of different height and varied spacing
c) Minute succession of valleys and hills of same height and same gap
d) Minute succession of valleys of different depth

71. Flank is a __________
a) line
b) point
c) distance
d) surface

72. For acme thread the angle between the two flanks is ____
a) 55 degrees
b) 47.5 degrees
c) 29 degrees
d) 45 degrees

73. According to Taylor's principle which type of gauge checks both size and geometric
features?
a. Go gauge
b. No go gauge
c. Both a. and b.
d. None of the above

74. What is used to measure the major 

a. Bench micrometer
b. Thread micrometer 

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