$1\mathrm{.}1.$ Define flameproof enclosures and intrinsic safety in the context of coal mining. Explain how each method prevents the ignition of methane$/$air mixtures.

$(8$ Marks$)$

$1\mathrm{.}2.$ Demonstrate with Diagrams the Design of Flameproof Enclosures.

$(6$ Marks$)$

$1\mathrm{.}3.$ Decide between flameproof enclosures and intrinsically safe equipment for a hypothetical new coal mining operation. Justify your recommendation by comparing the safety, maintenance requirements, operational flexibility, cost, and compliance with safety standards for both options.

$(10$ Marks$)$