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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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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Metrology- Slip gauge, Dial indicator, Bevel protractor, Sine bar, Angle gauge

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METROLOGY Metrology is the science of measurements. In manufacturing industry the dimensions are measured to control the shape and sizes of an object Controlled measurements are necessary in the manufacture of interchangeable parts Linear Measuring Instruments Slip gauges Dial indicator Angle Measuring Instruments Bevel Protractor Sine bar Angle gauge Slip gauges Slip gauges are used for precise measurement of parts and for verifying measuring tools such as micrometers,comparators and various limit gauges Slip gauges are rectangular blocks made of alloy steel having a cross-section of about 32mm by 9mm The distance between two opposite faces determines the size of the gauge During use, the required number of gauge blocks are used together to know the required dimension. Dial Indicators Dial indicators are used to test and inspect the size and trueness of a finished work It is measured to an accuracy of 0.01mm They are also used in conjunction with other measuring instruments like ...
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