Manufacturer's specifications state that the piston in a motorcycle engine must have a diameter of d = 74.940 ± 0.002 mm to be serviceable. Your assistant uses a (presumably accurate) high-precision micrometer which has a precision of ±0.001 mm to measure all of the pistons that he can find. From the following list that he gives you, select all of the measurements that are most certainly within specifications. d = 74.933 mm d=74.94 mm d=74.9418 mm d=74.940 mm d = 74.944 mm d = 74.938 mm d=74.939 mm d=74.941 mm d=74.9420 mm d=74.9389 mm
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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