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Saturday, 7 March 2015

Comparators - True and False

Comparators - True and False Points : comparators, measuring instruments, mechanical engineering, metrology, mechanical technology, mcqs, evaluation, judgment, gauging, rating, consideration, analysis, examination, workup, test, review, objective type question and answer, true and false True and False
  1. Errors due to parallax is not possible as the moving pointer moves over a fixed scale in mechanical comparators. F
  2. Pneumatic comparators the indicating instrument can not be remote from the measuring unit. F
  3. Pneumatic comparator, different gauging heads are not required for different dimensions. F
  4. The micrometer microscope was the first type of microscope to be used in measurement related to engineering. T
  5. For ordinary workshop condition, mechanical comparators are not suitable. F
  6. The calibration of instrument over full range is of no importance as comparison is done with a standard end length. T
  7. The advantages of comparators are that not much skill is required on the part of operator in its use. T
  8. Comparators provision must be made for minimum compensation for temperature effects. F
  9. Pneumatic comparator is very suitable device for measuring diameter of holes, where the diameter is small compared with the length. T
  10. Electro-limit gauge was one of the first electrical comparators to be made available. T
  11. The workshop microscope generally consist of a microscope on simple stand. T
  12. The Universal measuring microscope is not similar to the tool maker’s microscope. F
  13. Electrical and electronic instruments are usually more expensive then mechanical instruments. T
  14. It is difficult to assess the efficiency of a toolmaker’s microscope with regard. to accuracy of measurement. T
  15. The electrical comparators have got small number of moving parts. T
  16. In optical comparators, the apparatus supply is not necessary. F
  17. Electric comparator the mechanism carrying the pointer in very light and sensitive to vibrations. F
  18. Electric supply is necessary for optical comparators. T
  19. The mechanical comparators have got more moving parts than the other types. T
  20. In comparator the measuring pressure should be high and constant. F

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