# GATE Mechanical 2014 Set 2 | Question: 20

The flatness of a machine bed can be measured using

1. Vernier calipers
2. Auto collimator
3. Height gauge
4. Tool maker’s microscope

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A cylindrical pin of $25^{+0.020}_{+0.010}$ mm diameter is electroplated. Plating thickness is $2.0^{\pm0.005}$ mm. Neglecting the gauge tolerance, the diameter (in mm, up to $3$ decimal points accuracy) of the GO ring gauge to inspect the plated pin is __________.
A metric thread of pitch $2$ $mm$ and thread angle $60^{\circ}$ is inspected for its pitch diameter using $3$-wire method. The diameter of the best size wire in $mm$ is $0.866$ $1.000$ $1.154$ $2.000$
Cylindrical pins of $25^{\begin{Bmatrix} +0.020\\ +0.010 \end{Bmatrix}$}mm$diameter are electroplated in a shop. Thickness of the plating is$30^{\pm 2.0}micron$. Neglecting gage tolerances, the size of the$GO$gage in$mm$to inspect the plated components is$25.04225.05225.07425.084$0 votes 0 answers A hole of$20mm$diameter is to be drilled in a steel block of$40mm$thickness. The drilling is performed at rotational speed of$400rpm$and feed rate of$0.1mm/rev$. The required approach and over run of the drill together is equal to the radius of drill. The drilling time (in minute) is$1.001.251.501.75$0 votes 0 answers A mild steel plate has to be rolled in one pass such that the final plate thickness is$2/3^{rd}$of the initial thickness, with the entrance speed of$10 \: m/min$and roll diameter of$500mm$. If the plate widens by$2\%$during rolling, the exit velocity (in$m/min\$) is _______