155. Which of the following methods is not concerned with surface finish measurement
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156. A spirit level is required to have 2 mm of bubble movement of 2" inclination. The
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157. The only natural material producing a spectral line (6440? A red) almost completely symmetrical is
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158. A photo-electric device in which the resistance of the metal changes directly, proportional to the light striking on it, is known as
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159. Universal surface gauge is used for
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160. Which of the following is not the correct method of specifying numerical value of surface roughness mean line
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161. According to Taylor's Principle, No Go gauge checks
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