Cochran Boiler: 17 MCQs with answers

Fire tube, internally fired, vertical

The Cochran boiler is a vertical, fire-tube boiler with internal furnace, making it compact and efficient for low to moderate steam generation.

To remove flue gases and create draft

The chimney discharges flue gases to the atmosphere and provides natural draft to maintain airflow through the furnace.

To allow inspection and cleaning of the boiler interior

The manhole is an access opening for maintenance, inspection, and cleaning of the internal surfaces.

Smoke box and then chimney

The smoke box collects gases from the flue tubes and directs them to the chimney for discharge.

Steam pressure inside the boiler shell

The pressure gauge indicates the steam pressure relative to atmospheric pressure, helping operators monitor safe operation.

False

The Cochran boiler is a fire-tube boiler because hot gases pass through tubes surrounded by water.

Crown plate

The crown plate is the top of the internal furnace; hot gases rise and strike it, transferring heat to the water above.

Horizontal flue tubes

After the firebox, gases travel through a series of horizontal flue tubes surrounded by water, maximizing heat transfer.

Safety valve, pressure gauge, water level indicator

Safety valve, pressure gauge, and water level indicator are mandatory mountings to prevent overpressure and ensure safe water level.

To support the fuel and allow air to pass through

The grate holds the solid fuel while permitting primary air to flow upward for combustion; ash falls through the grate.

It is a vertical boiler with a spherical top

The Cochran boiler is vertical with a hemispherical or spherical top, which gives strength and compactness; it is not for extremely high pressures.

To remove sediment and sludge from the bottom

The blow-off cock is located at the bottom to discharge accumulated mud, scale, and impurities periodically.

Water drum

Cochran boiler is a fire-tube boiler; it does not have a water drum, which is typical of water-tube boilers.

It requires less floor space

The vertical orientation makes the Cochran boiler compact, occupying minimal floor area compared to horizontal boilers.

True

The crown plate forms the top of the internal furnace and receives direct heat from the burning fuel.

Firebrick

Firebrick lining insulates the shell from intense furnace heat, preventing overheating and structural damage.

At the top of the shell, above the water level

Steam collects in the upper part of the shell, above the water line, and is drawn off through the steam pipe.