Quiznetik

Metrology and Measurements | Set 1

1. What is the relation between variation due to observation, manufacturing process and measuring process of a product?

A. σobservation = σprocess + σmeasurement

B. σobservation = σprocess – σmeasurement

C. σobservation = σprocess * σmeasurement

D. σobservation = σprocess / σmeasurement

Correct : A. σobservation = σprocess + σmeasurement

2. movements?

A. 0.04 mm

B. 0.05 mm

C. 0.07 mm

D. 0.06 mm

Correct : D. 0.06 mm

3. rotation in universal micrometer?

A. dial indicator

B. slip gauges

C. control shaft

D. universal microscope

Correct : C. control shaft

4. used for setting of helix angles in universal micrometer?

A. 1’

B. 2’

C. 3’

D. 4’

Correct : A. 1’

5. Which of the following is true for the calibration of instruments?

A. in casting and fabrication shops the measurements made are of more precise nature as compared to those made in machine shop and tool room

B. periodical calibration is made for optical measuring instruments

C. there is no need of periodic calibration in universal microscope

D. preventive maintenance is not necessary for optical measuring instruments

Correct : B. periodical calibration is made for optical measuring instruments

6. What is the permissible error in straight movement of longitudinal and transverse table in horizontal plane?

A. 0.002 mm

B. 0.003 mm

C. 0.004 mm

D. 0.005 mm

Correct : A. 0.002 mm

7. Which of the following is true for checking the Relative perpendicular motion of the longitudinal and transverse carriage?

A. the permissible error allowed is 0.005 mm in 2500 mm length.

B. this is checked using a slip gauges

C. precision square of class i or 0 is used

D. maximum error in precision error is of ± 10″ in squareness

Correct : C. precision square of class i or 0 is used

8. What is the maximum permissible error in wear of centres?

A. 0.04 mm

B. 0.03 mm

C. 0.02 mm

D. 0.01 mm

Correct : D. 0.01 mm

9. What is the least count of dial indicators which can be calibrated using passmeter?

A. 0.01 mm

B. 0.03 mm

C. 0.05 mm

D. 0.07 mm

Correct : A. 0.01 mm

10. Which of the following is caused bycareless handling?

A. systematic error

B. gross error

C. random error

D. none of the mentioned

Correct : B. gross error

11. ‘A system will be error free if we removeall systematic error’.

A. true

B. false

Correct : B. false

12. Which of the following is not afundamental quantity?

A. length

B. angle

C. time

D. luminous intensity

Correct : B. angle

13. Which standard is fixed and used forindustrial laboratories?

A. international standard

B. primary standard

C. secondary standard

D. working standard

Correct : C. secondary standard

14. Which of the following error is caused bypoor calibration of the instrument?

A. random error

B. gross error

C. systematic error

D. precision error

Correct : C. systematic error

15. Starting position of an object is representedas x=5.1±0.2m and finishing position asy=6.9±0.3m. What will be the displacementand error in displacement?

A. displacement = 1m, error = 0.5m

B. displacement = 2m, error = 0.36m

C. displacement = 1.8m, error = 0.36m

D. displacement = 1.5m, error = 0.4m

Correct : C. displacement = 1.8m, error = 0.36m

16. ‘Zero error is an indication of instrumental error’.

A. true

B. false

Correct : A. true

17. Which of the following is not among the methods of linear measurements?

A. direct measurements

B. measurements by optical means

C. indirect measurements

D. electromagnetic methods or edm

Correct : C. indirect measurements

18. Which of the following is not a method of measuring the distances directly?

A. pacing

B. measurement with passometer

C. measurement with pedometer

D. measurement with theodolite

Correct : D. measurement with theodolite

19. Which of the following measurements varies with an individual before computing the length of line?

A. chaining

B. pacing

C. levelling

D. contouring

Correct : B. pacing

20. Which method consists in counting the number of paces between the two points of a line?

A. chaining

B. pacing

C. levelling

D. contouring

Correct : B. pacing

21. Pacing is difficult in

A. smooth surfaces

B. plain areas

C. rough ground

D. plateaus

Correct : C. rough ground

22. Which instrument mechanism is operated by motion of the body and it automatically registers the number of paces, thus avoiding the monotony and strain of counting the paces, by the surveyor?

A. passometer

B. pedometer

C. odometer

D. chaining

Correct : A. passometer

23. Which instrument registers total distance covered by any number of pace?

A. passometer

B. pedometer

C. odometer

D. chaining

Correct : B. pedometer

24. Instrument for registering the number of revolutions of a wheel is

A. odometer

B. pedometer

C. pedometer

D. chaining

Correct : A. odometer

25. Most accurate method of direct measuring is with

A. passometer

B. pedometer

C. theodolite

D. chaining

Correct : D. chaining

26. Which of the following is not under direct measurement?

A. pacing

B. chaining

C. taping

D. triangulation

Correct : D. triangulation

27. ground?

A. spirit level

B. plumb bob

C. butt rod

D. pegs

Correct : B. plumb bob

28. What is used for measuring offsets, but it is often used by building surveyors or architects?

A. plum bob

B. butt rod

C. pegs

D. laths

Correct : B. butt rod

29. What is used in centering aid in theodolites, compass, plane table and variety of other surveying instruments?

A. butt rod

B. whites

C. laths

D. plumb bob

Correct : D. plumb bob

30. Which of the following option is incorrect about interchangeability?

A. increase output

B. increase cost of production

C. useful in mass production

D. assembly time increases

Correct : D. assembly time increases

31. What are the main considerations for deciding the limits of a particular part?

A. functional requirement

B. economics and interchangeability

C. interchangeability and functional requirement

D. interchangeability, functional requirement and economics

Correct : D. interchangeability, functional requirement and economics

32. For full interchangeability, what is the relation between the process capability of a machine and manufacturing tolerance of the part?

A. process capability = manufacturing tolerance

B. process capability ≥ manufacturing tolerance

C. process capability > manufacturing tolerance

D. process capability ≤ manufacturing tolerance

Correct : D. process capability ≤ manufacturing tolerance

33. Which of the following option is correct in given statements about interchangeability? Statement 1: Standardisation is not so much of importance for interchangeability. Statement 2: Interchangeability follows ‘normal distribution’.

A. f, t

B. t, t

C. f, f

D. t, f

Correct : A. f, t

34. Which of the following option is not correct for ‘full interchangeability’?

A. this type of interchangeability is not feasible sometimes

B. requires machine which can maintain low process capability

C. machines with very high accuracy are necessary

D. for interchangeable production, this type of interchangeability is not must

Correct : B. requires machine which can maintain low process capability

35. What is the correct formula to find no. of groups in selective assembly?

A. process capability / tolerance desired

B. tolerance desired / process capability

C. tolerance desired * process capability

D. tolerance desired + process capability

Correct : A. process capability / tolerance desired

36. What is a limit system?

A. series of tolerances

B. series of fits

C. series of clearances

D. series of limits

Correct : A. series of tolerances

37. Which of the following is used to check change in ocular lines position due to column rotation in universal micrometer?

A. dial indicator

B. slip gauges

C. control shaft

D. universal microscope

Correct : C. control shaft

38. What is the least count of clinometer which is used to check reading of column rotation used for setting of helix angles in universal micrometer?

A. 1’

B. 2’

C. 3’

D. 4’

Correct : A. 1’

39. How 34’ can be built by using angle gauges?

A. 27’+9’-3’+1’

B. 26’+10’-2’

C. 27’+10’-3’

D. 27’+8’

Correct : A. 27’+9’-3’+1’

40. In how many series the gauges can be divided?

A. 1

B. 2

C. 3

D. 4

Correct : C. 3

41. What is the approximate size of angle gauges?

A. 76mm long and 16 wide

B. 85mm long and 26 wide

C. 16mm long and 75 wide

D. 70mm long and 18 wide

Correct : A. 76mm long and 16 wide

42. What is the accuracy of master angle gauges?

A. 0.1 sec

B. 1 sec

C. 0.25 sec

D. 3 sec

Correct : C. 0.25 sec

43. Which gauges are present in the first series (degree) of angle gauges?

A. 5°, 10°, 15°, 25° and 40°

B. 1°, 3°, 9°, 27° and 41°

C. 1°, 5°, 9°, 25° and 45°

D. 5°, 10°, 15°, 30° and 45°

Correct : B. 1°, 3°, 9°, 27° and 41°

44. How many sets of angle gauges are available?

A. 1

B. 2

C. 3

D. 4

Correct : B. 2

45. Statement 2: Interferometry can be used to calibrate angle gauges.

A. t, f

B. f, f

C. f, t

D. t, t

Correct : C. f, t

46. What are the two grades of angle gauges?

A. master and tool room

B. precise and normal

C. standard and industrial

D. high and low

Correct : A. master and tool room

47. How angle greater than 90° is measured?

A. by repeating gauges

B. using square plate

C. using sine bar

D. using auto collimator

Correct : B. using square plate

48. Which of the following is not a gauge from standard B angle gauges?

A. 0.05’

B. 1’

C. 27’

D. 30

Correct : A. 0.05’

49. Which of the following is not true about metrology lasers used in laser inspection?

A. these are high-power instruments

B. used for rapid non-contact gauging of delicate parts

C. have low optical cross-talk

D. wide dynamic range

Correct : A. these are high-power instruments

50. What is the wavelength of light produced by He-Ne laser in laser inspection?

A. 6988 Å

B. 5328 Å

C. 5928 Å

D. 6328 Å

Correct : D. 6328 Å

51. Which technique is not suitable to measure large diameter parts or large gaps?

A. diffraction pattern technique

B. scanning laser technique

C. photodiode array imaging

D. laser triangulation sensor

Correct : A. diffraction pattern technique

52. Which of the following is true about resolution in two frequency laser interferometer?

A. straightness resolution – 90 nm

B. angular resolution – 3 arc seconds

C. flatness resolution – 2 nm

D. linear resolution – 1 nm

Correct : D. linear resolution – 1 nm

53. How much accuracy can be achieved by photodiode array imaging?

A. ±0.05 μm

B. ±0.15 μm

C. ±0.5 μm

D. ±0.25 μm

Correct : A. ±0.05 μm

54. Which application is ideally suited for two frequency laser interferometer?

A. pitch and yaw measurement

B. hole diameters

C. thickness measurement

D. measurement of edge locations

Correct : A. pitch and yaw measurement

55. The location of the image spot directly depends on which factor in laser triangulation sensor technique?

A. wavelength of laser

B. measuring range

C. standoff distance

D. focal length of lense

Correct : C. standoff distance

56. Which technique from given laser inspection techniques is useful for measuring the diameter of hot steel bars?

A. laser scanning gauge

B. frequency laser interferometer

C. laser triangulation sensors

D. photodiode array imaging

Correct : A. laser scanning gauge

57. Where does wire is placed in a measurement of diameter using the technique of gauging wide diameter from the diffraction pattern formed in a laser beam?

A. between collimator and lens

B. between collimator and source

C. between collimator and plane of measurement

D. between collimator and detectors

Correct : C. between collimator and plane of measurement

58. How many sensors are needed to measure part thickness by using laser triangulation sensors?

A. 1

B. 2

C. 3

D. 4

Correct : B. 2

59. 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

Correct : D. precise movement in x, y and z coordinates

60. 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

Correct : C. horizontal boring mill type

61. Which direction is sensed by a 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

Correct : C. both positive and negative direction

62. What is the accuracy of present day co- ordinate measuring machine?

A. 10 microns

B. 5 microns

C. 2 microns

D. 1 micron

Correct : A. 10 microns

63. What is the name of an element which uses inductive coupling?

A. inducto conduct

B. inductosyn

C. conductosyn

D. conducto induct

Correct : B. inductosyn

64. Which principle is used in the three master guideways and probe location?

A. principle of dynamic design

B. principle of static design

C. principle of kinematic design

D. principle of effective design

Correct : C. principle of kinematic design

65. What is the cause of translational errors in CMM?

A. error in scale division

B. error in straightness

C. twisting error

D. roll error

Correct : B. error in straightness

66. Which of the following is not related to the geometrical accuracy of CMM?

A. straightness of axes

B. squareness of axes

C. position accuracy

D. axial length measuring accuracy

Correct : D. axial length measuring accuracy

67. How many measurement parameters are considered in checking axes accuracy of straightness in CMM?

A. 2

B. 4

C. 6

D. 8

Correct : C. 6

68. How many reference gauges are measured for volumetric length measuring accuracy in CMM?

A. 2

B. 3

C. 4

D. 5

Correct : B. 3

69. Which of the following is true for trigger type probe system used in computer controlled CMM?

A. bucking mechanism is a 2 point bearing

B. current coordinate position stored when circuit is close

C. contacts of point bearing arranged at 90 degree

D. contacts of point bearing act as electrical micro switches

Correct : D. contacts of point bearing act as electrical micro switches

70. What does the total number of pixels in the region defines?

A. perimeter

B. area

C. intensity

D. brightness

Correct : B. area

71. What is the unit of compactness of a region?

A. meter

B. meter2

C. no units

D. meter-1

Correct : C. no units

72. For which of the following regions, compactness is minimal?

A. rectangle

B. square

C. irregular

D. disk

Correct : D. disk

73. Compactness is insensitive to orientation.

A. true

B. false

Correct : A. true

74. Which of the following measures are not used to describe a region?

A. mean and median of grey values

B. minimum and maximum of grey values

C. number of pixels alone

D. number of pixels above and below mean

Correct : C. number of pixels alone

75. We cannot use normalized area as one of the region descriptor.

A. true

B. false

Correct : B. false

76. What is the study of properties of a figure that are unaffected by any deformation?

A. topology

B. geography

C. statistics

D. deformation

Correct : A. topology

77. On which of the following operation of an image, the topology of the region changes?

A. stretching

B. rotation

C. folding

D. change in distance measure

Correct : C. folding

78. Topological properties don’t depend on the distance measures.

A. true

B. false

Correct : A. true

79. What is the Euler number of the image shown below?

A. 0

B. 1

C. 2

D. -1

Correct : D. -1

80. What is the Euler number of a region with polygonal network containing V,Q and F as the number of vertices, edges and faces respectively?

A. v+q+f

B. v-q+f

C. v+q-f

D. v-q-f

Correct : B. v-q+f

81. What is the Euler number of the region shown in the figure below?

A. 1

B. -2

C. -1

D. 2

Correct : B. -2

82. The texture of the region provides measure of which of the following properties?

A. smoothness alone

B. coarseness alone

C. regularity alone

D. smoothness, coarseness and regularity

Correct : D. smoothness, coarseness and regularity

83. Structural techniques deal with the arrangement of image primitives.

A. true

B. false

Correct : A. true

84. Which of the following techniques is based on the Fourier transform?

A. structural

B. spectral

C. statistical

D. topological

Correct : B. spectral

85. Who gave the fundamental principle of straightness measurement?

A. bryan

B. moire

C. euler

D. amedeo

Correct : A. bryan

86. Which of the following represents the quality of straightness in precision engineering?

A. spirit level

B. straight edge

C. autocollimator

D. dial indicator

Correct : B. straight edge

87. 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

Correct : A. maximum deviation from the straight line joining two extremities

88. What is the name of a pair of straight edges?

A. drum sticks

B. lower pair

C. winding sticks

D. self closed pair

Correct : C. winding sticks

89. What is the position of straightness interferometer in straightness measurement optics?

A. before laser head

B. after straightness reflector

C. between laser head and straightness reflector

D. no need of interferometer

Correct : C. between laser head and straightness reflector

90. What is the range of straightness measurement in straightness measurement optics?

A. ±2.5 mm

B. ±5 mm

C. ±10 mm

D. ±20 mm

Correct : A. ±2.5 mm

91. Which of the following is not the factor affecting the accuracy of straightness measurement by optics?

A. air turbulence

B. optics fixed rigidly

C. slope error

D. localised heat sources

Correct : B. optics fixed rigidly

92. At which part of the precision straight edge is generally lapped?

A. edges only

B. base only

C. base and edges both

D. all over the surface

Correct : A. edges only

93. What type of thread is formed on female screw gauge?

A. external thread

B. internal thread

C. both internal and external

D. major screw thread

Correct : B. internal thread

94. Which of the following option is true for truncation?

A. thread can be tranculated at crest only

B. thread can be tranculatd at root only

C. thread can be tranculated at crest and root both

D. thread can’t be tranculated at crest and root both

Correct : C. thread can be tranculated at crest and root both

95. What is dedendum for external threads?

A. radial distance between pitch and minor cylinder

B. radial distance between major and pitch cylinder

C. radial distance between major and minor cylinder

D. axial distance between major and pitch cylinder

Correct : A. radial distance between pitch and minor cylinder

96. Which of the following is not a name of the major diameter of an external thread?

A. outside diameter

B. crest diameter

C. full diameter

D. cone diameter

Correct : D. cone diameter

97. Which of the following is not true about the axial thickness of screw thread?

A. measured in direction perpendicular to the axis of thread

B. measured on pitch cylinder

C. distance between opposite faces of same thread

D. measured at the same thread

Correct : A. measured in direction perpendicular to the axis of thread

98. What is the alternative name of functional diameter?

A. cone diameter

B. virtual diameter

C. root diameter

D. inside diameter

Correct : B. virtual diameter

99. What is a thread per inch in screw thread?

A. pitch in inches

B. axial distance moved by threaded part

C. reciprocal of pitch in inches

D. radial distance moved by threaded part

Correct : C. reciprocal of pitch in inches

100. Which of the following is not true about effective diameter?

A. also known as pitch diameter

B. it decides quality of fit between nut and screw

C. this is the diameter of minor cylinder

D. it is a very important dimension for screw threads

Correct : C. this is the diameter of minor cylinder