28. The edges of a cast iron block weighing 32 kg were rounded off with a mill. When the block was reweighed, it was found to weigh only 29 5 kg. What percentage of the original cast iron block was lost? A. 7.8% B. 8.5% C. 3.4% D. 2.5% If 3.5 L of used oil were to be disposed of each week over a three-year period, the 29. total number of liters disposed of at the end of this time, assuming there are 52 weeks in a year, would be A. 495 L B. 546 L
Theory and Design for Mechanical Measurements
Measurement is a term that refers to analyzing a manufactured component regarding the degree of accuracy for dimensions, tolerances, geometric profile, roundness, flatness, smoothness, etc. Measurement always involves comparing the manufactured component or the prototype with a standard specimen whose dimensions and other parameters are assumed to be perfect and do not undergo changes with respect to time.Precisely in mechanical engineering the branch that deals with the application of scientific principles for measurements is known as metrology. The domain of metrology in general deals with various measurements like mechanical, chemical, thermodynamic, physical, and biological measurements. In mechanical engineering, the measurements are limited to mechanical specific such as length, mass, surface profile, flatness, roundness, viscosity, heat transfer, etc.
Basic principles of engineering metrology
Metrology is described as the science of measurement, precision, and accuracy. In other words, it is a method of measurement based on units and predefined standards.
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