metrology and measurements mcq1

1. Which of the following errors is eliminated or minimized by zero setting adjustment on a dial indicator? Ans (c)

(a) Parallax error (c) Alignment error (b) Inherent error (d) Computational error    

 2. Wringing of slip gauges is used in   Ans (d)

(a) line measurement (b) primary standards (c) both line and end measurements (d) end measurement 

3. How many grades of tolerances does the ISO system of limits and fits specify?   Ans:(c)

(a) 12 (b) 08 (c) 18 (d) 25

4. The most appropriate reason for specifying grades of tolerances in ISO system is Ans:(a)

 (a) to improve accuracy of manufacture  (b) for convenience

(c) for ease of manufacture of parts (d) to help quality personnel accept more components

5. In a shaft basis system, the upper deviation of the size of shaft is    Ans:(d)

 (a)1  (b) less than 0 (c) not related to size (d) 0

6. In the hole and shaft pair designation of 40 H7/ d9, the numbers 7 and 9 indicate    Ans:(b)

 (a) nothing of importance (b) tolerance grade (c) accuracy of manufacture (d) ease of assembly

7. NO GO gauges are designed        Ans:(a)

(a) for maximum passability (b) for maximum impassability (c) without any specified conditions (d) without attaching any importance to them

8. An allowance is provided     Ans:(c)

(a) to help the operator (b) to aid in production (c) intentionally (d) as permissive tolerance

9. LML corresponds to the    Ans:(b)

(a) lower limit of a hole and higher limit of the shaft (b) higher limit of a hole and lower limit of the shaft (c) lower limit of a shaft and lower limit of the hole (d) higher limit of a shaft and higher limit of the hole

10. Limit gauges are used to    Ans:(c)

 (a) measure flatness of the component (b) measure exact size of the component (c) check if the component dimension lies within permissible limits (d) measure surface roughness of the component

11. According to Taylor’s principle, GO gauges are designed to check     Ans:(a)

(a) maximum metal condition (b) minimum metal condition (c) both of these (d) none of these

12. Micrometer measuring faces are tipped with to prevent rapid wear.    Ans:(d)

(a) aluminium (c) molybdenum oxide (b) chromium (d) tungsten carbide

13. Which of the following best describes wringing of slip gauges?   Ans:(b)

(a) Squeezing the oil out from between two gauges (b) Causing blocks to adhere by molecular attraction (c) Effect of atmospheric pressure (d) Process of removing minute burrs

14. Slip gauges marked with the letter ‘P’ are    Ans:(a)

 (a) wear gauges (b) preferred gauges (c) discarded gauges (d) inspection grade gauges

15. While measuring the angle of a workpiece using a universal bevel protractor in clockwise direction, in which quadrants can the angle be read directly from the scale?   Ans:(b)

(a) Quadrants I and II (b) Quadrants I and III (c) Quadrant I only (d) All the quadrants

16. The purpose of providing relief holes in sine bars is to   Ans:(c)

 (a) improve accuracy (c) reduce weight (b) improve precision (d) reduce wear

17. The maximum angle that can be set using a sine bar is limited to  Ans:(c)

(a) 15° (c) 45° (b) 30° (d) 60°

18. The performance of the spirit level is governed by the geometrical relationship between the bubble and      Ans:(c)

 (a) a single datum (b) its top plate (c) two references (d) three references along mutually perpendicular directions

19. In comparison measurement, precision depends on .   Ans:(b)

 (a) least count of the comparator (b) least count of the standard (c) least count of the scale of the instrument (d) all of these

20. The basic principle of the Johansson mikrokator is based on   Ans:(d)

 (a) Johansson movement (b) Abbey movement (c) Abraham movement (d) Abramson movement

21. In a Sigma mechanical comparator, magnification is obtained   Ans:(b)

 (a) in a single stage (b) in two stages (c) in three stages (d) depending on the manufacturer’s instruction

22. Double reflection of light using a pair of mirrors is a unique feature of  Ans:(c)

 (a) an autocollimator (b) a clinometer (c) a Zeiss ultra-optimeter (d) an optical projector

23. Which of the following comparators is noncontact type?  Ans:(d)

(a) Johansson mikrokator (b) Mechanical optical comparator (c) Sigma comparator (d) LVDT

24. Which of the following typifies measurement with light waves?   Ans:(d)

(a) Gauge blocks (b) Perfectly lapped surfaces (c) Comparison measurement (d) Optical flats

25. What is the significance of krypton-86 in measuring length?  Ans:(b)

(a) It is the only wavelength that does not fluctuate. (b) It is the most easily reproducible wavelength.  (c) It is less harmful to the human eye. (d) It produces pleasant colours.

26. The element that makes a microscope a measuring instrument is  Ans:(c)

(a) objective lens (c) reticle (b) light beam (d) none of these

27. An optical flat can be employed to measure height differences in the range of Ans:(a)

 (a) 0.01–0.1mm (c) 10–100mm (b) 1–10mm (d) 1–10m

28. One major limitation of laser interferometry is that  Ans:(c)

(a) it generates only two wavelengths (b) it does not have a constant wavelength (c) it generates only a single wavelength (d) its wavelength cannot be predicted

29. Which of the following statements is true? Ans:(a)

(a) The longer the sine bar, the better the accuracy. (b) The shorter the sine bar, the better the accuracy. (c) Accuracy of a sine bar does not depend on an ambient temperature. (d) A sine bar cannot measure unknown angles.

30. The main use of a tool maker’s microscope is in measuring Ans:(b) 

 (a) phase shift of monochromatic light (b) shape, size, and angle of small components (c) biological degradation of small machine components (d) contours of large machine parts