Question 554General Subjects - Assistant Engineer

The correct answer is A) Diaphragm type pressure gauge. Diaphragm type pressure gauges are most appropriate for measuring pressures very close to atmospheric pressure, such as boiler furnace draft pressure. This is because diaphragm gauges are highly sensitive and can accurately measure small pressure changes near the atmospheric pressure range. Compared to the other options, diaphragm gauges are better suited for this application. Bellows, spiral, and Bourdon tube pressure gauges are generally more appropriate for measuring higher pressure ranges and may not provide the necessary sensitivity and accuracy for pressures close to atmospheric pressure.