πŸ“Š Metrology and Measurements
Q. What is the Euler number of the region shown in the figure below?
  • (A) 1
  • (B) -2
  • (C) -1
  • (D) 2
πŸ’¬ Discuss
βœ… Correct Answer: (B) -2

Explanation: the polygonal network given in the figure has 7 vertices, 11 edges and 2 faces. thus the euler number is given by the formula,

πŸ“Š Metrology and Measurements
Q. 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
πŸ’¬ Discuss
βœ… Correct Answer: (D) smoothness, coarseness and regularity

Explanation: one of the important approach to region description is texture content. this helps to provide the measure of some of the important properties of an image like smoothness, coarseness and regularity of the region.

πŸ“Š Metrology and Measurements
Q. Structural techniques deal with the arrangement of image primitives.
  • (A) true
  • (B) false
  • (C) ---
  • (D) ---
πŸ’¬ Discuss
βœ… Correct Answer: (A) true

Explanation: structural techniques deal with the arrangement of image primitives, such as the description of the texture based on the regularly spaced parallel lines.

πŸ“Š Metrology and Measurements
Q. Which of the following techniques is based on the Fourier transform?
  • (A) structural
  • (B) spectral
  • (C) statistical
  • (D) topological
πŸ’¬ Discuss
βœ… Correct Answer: (B) spectral

Explanation: spectral techniques are based on properties of the fourier spectrum and are used primarily to detect global periodicity in an image by identifying high energy, narrow peaks in the image.

πŸ“Š Metrology and Measurements
Q. Who gave the fundamental principle of straightness measurement?
  • (A) bryan
  • (B) moire
  • (C) euler
  • (D) amedeo
πŸ’¬ Discuss
βœ… Correct Answer: (A) bryan

Explanation: fundamental principle of measurement of straightness is given by bryan. according to this principle, “a straightness measurement system should be in

πŸ“Š Metrology and Measurements
Q. Which of the following represents the quality of straightness in precision engineering?
  • (A) spirit level
  • (B) straight edge
  • (C) autocollimator
  • (D) dial indicator
πŸ’¬ Discuss
βœ… Correct Answer: (B) straight edge

Explanation: at many places, it is necessary that the surface must be straight e.g. in lathe machine it is required that the tool must move in straight path. straight line is the basis of most methods of measurements.

πŸ“Š Metrology and Measurements
Q. 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
πŸ’¬ Discuss
βœ… Correct Answer: (A) maximum deviation from the straight line joining two extremities

Explanation: the tolerance on the straightness of a line can be defined as the maximum deviation in

πŸ“Š Metrology and Measurements
Q. What is the name of a pair of straight edges?
  • (A) drum sticks
  • (B) lower pair
  • (C) winding sticks
  • (D) self closed pair
πŸ’¬ Discuss
βœ… Correct Answer: (C) winding sticks

Explanation: straight edge is a measuring tool consist of a steel and is used to check the straightness. straight edges are used in machining industry and automotive service. winding stick is a pair of straight edges which are used in woodwork.

πŸ“Š Metrology and Measurements
Q. 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
πŸ’¬ Discuss
βœ… Correct Answer: (C) between laser head and straightness reflector

Explanation: straightness interferometer is placed between laser head and reflector.

πŸ“Š Metrology and Measurements
Q. What is the range of straightness measurement in straightness measurement optics?
  • (A) ±2.5 mm
  • (B) ±5 mm
  • (C) ±10 mm
  • (D) ±20 mm
πŸ’¬ Discuss
βœ… Correct Answer: (A) ±2.5 mm

Explanation: to measure straightness errors in a linear axis, straightness measurement optics are used. for both short range and long range measurement, length of straightness measurement is ±2.5 mm.

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