Mechanical Engineering MCQs

 1. Workshop Technology MCQs

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pneumatic comparator and solex pneumatic comparator

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Principle of pneumatic comparator The measurement is made by taking reading using master gauge of known accuracy and comparing with component reading It uses a controlled, pressurised jet of air to measure small dimensional variation in the size of component The working principle of pneumatic comparator depends on the flow of air between the gauge head and the component being checked Important characteristics Very high magnifications are possible It can be used to measure diameters, length, squareness, parallelisms, concentricity,taper, and other geometric conditions. Internal dimensions can be readily measured , in other words, while measuring a bore it can reveal complete details of size, taper, straightness,camber and bell mouth etc. It is independent of the operator skill High pressure air gauging can be done by cleaning the parts which helps to eliminate errors due to dirt and foreign matter. As there is no physical contact made either with the setting gauge (or)
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surface roughness and straightedge surfaceplate surface gauge visual inspection profilometer opticalflat

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Surface roughness On any finished surface,imperfections are found and these take the form of a succession of hills and valleys Which vary both in height and in spacing and result in a kind of texture which in appearance or feel. Straight edge Straightedges are commonly used for testing the straightness and flatness of plane surfaces Flatness is checked by a light test The narrow edge of the tool is applied to the surface to be tested and kept horizontally at the eye level Watching for light between the straightedge and the surface along the straightedge Light seen at one place or another indicates deviation from straightness Surface plate Surface plate is used for testing the flatness of work itself and is also used for marking out work This is used for small pieces of work while the marking -out table is used for larger jobs It is used in conjunction with other gauges,the plate becomes a functional gauge in itself. Surface gauge Surface gauge is used in lay
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Autocollimator and tool makers micro scope

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Autocollimator The autocollimator is an optical instrument and is used to measure angular displacements with high accuracy of 0.2 seconds arc It can also be used to measure the flatness of a large surface Collimation of light If a point source of light is placed at the focal point of convex lens ,parallel rays of light are reflected by the lens. This is known as collimation of light A device with a lens suitable for causing light rays from a point source to become parallel is known as a collimato r Auto collimation of light Auto collimation of light occurs when reflecting surface is used in conjunction with a collimation lens system The collimation rays will be reflected back from the surface These rays pass through lens ,and unless reflecting surface is perfectly tangential to the lens axis ,will be brought to a focus along side of the light source Principle of the autocollimator From the fig. The light in the form of parallel rays , i
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