What is a enclosure which will withstand ignition of a flammable gas, and which will prevent the transmission of any flame able to ignite a flammable gas, which may be present in the surrounding atmosphere called?

Correct Answer: Option A — explosion proof

An explosion-proof enclosure is designed to contain an internal explosion of flammable gases without rupturing. It also prevents the transmission of flames to the external atmosphere by cooling the escaping gases through narrow, long flame paths, thus ensuring the surrounding hazardous atmosphere is not ignited by the equipment.