Question $3[20]$

$3\mathrm{.}1$ Callipers are used to measure features that are inaccessible to other tools. Name two types of callipers.

$3\mathrm{.}2$ Figure $1$ below shows a standard $0-25mm$ metric micrometer. Name all the parts of the micrometer from $A$ to $H.$

$(8)$

rigure $1.$ A standard $u-25mm$ metric micrometer

$3\mathrm{.}3$ Briefly explain the difference between the dot punch and the center punch and their applications.

$(10)$