183. The method of fractional coincidences in interferometry techniques is used for
A.Measurement of end gauges
B.Flatness of surface
C.Linear displacement measurements
D.Convexity/concavity of surfaces
184. An optical gauge works on the principle of
A.Reflection of light rays
B.Polarisation of light rays
C.Interference of light rays
D.Refraction of light rays
185. Involute fnnction of a gear is defmed as
A.(cos a ? a) radians
B.(sin a ? a) radians
C.(tan a ? a) radians
D.(cot a ? a) radians
186. The pitch circle raidus rp and base circle radius rb of a gear are related by the following relationship (a = pressure angle)
A.Rb= rp cos a (b) rb? cos a
B.(c) rb = rp sin a (d) rb = rp tan a (e) rb= r, (tan ? a).
C.18.224. The undercutting in case of 14-1 degree full depth involute teeth occurs when the number of teeth is less than
D.(a) 10
187. The undercutting in case of 14-1 degree full depth involute teeth occurs when the number of teeth is less than
A.10
B.32
C.18
D.25
188. During the gear tooth cutting operation the undercutting may occur, due to the corners of the cutter biting into the true involute curve on the flank of the tooth. This is called interference. It can be avoided by
A.Increasing the addendum on the pinion and reducing on the gear wheel
B.Increasing the addendum on both pinion and gear wheel
C.Reducing the addendum on both pinion and gear wheel
D.Reducing the addendum on the pinion and increasing on the gear wheel
189. A sine bar is used to measure
A.Surface roughness
B.Gear profiles
C.Internal tapers
D.External tapers
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