10+ 2nd class Boiler Operator Interview Questions and Answers

The interview question covers various topics related to boiler operation including types of gauge glass, valves, bearings, pumps, couplings, impellers, mountings and accessories, economiser, and deareator.

• Types of gauge glass include reflex, transparent, and tubular

• Types of valves include gate, globe, check, and safety valves

• Types of bearings include ball, roller, and sleeve bearings

• Types of pumps include centrifugal, reciprocating, and rotary pumps

• Types of couplings include ...read more

The level of water in steam drum should be maintained at a safe and optimal level.

• The level should be high enough to cover the tubes and prevent overheating.

• But it should not be too high to avoid carryover of water into the steam.

• The level is monitored by a water level indicator or gauge glass.

• The level can be adjusted by opening or closing the feedwater valve.

• The optimal level depends on the design and operating conditions of the boiler.

Low pressure boilers operate at a pressure of up to 15 psi while high pressure boilers operate at a pressure greater than 15 psi.

• Low pressure boilers are used for heating and producing hot water while high pressure boilers are used for power generation and industrial processes.

• Low pressure boilers have a simpler design and are less expensive to operate and maintain than high pressure boilers.

• High pressure boilers require more safety precautions and regular maintenance due to ...read more

It is difficult to provide an exact number as there are many box companies in the country.

• There are numerous box companies in the country, ranging from small local businesses to large corporations.

• The number of box companies may vary depending on the region or state.

• Some examples of box companies in the country include International Paper, WestRock, and Georgia-Pacific.

• The box industry is a competitive market with many players.

• It is important to research and compare different...read more

A boiler starts by filling with water, heating the water, creating steam, and then releasing the steam to power machinery.

• Water is added to the boiler through a feedwater pump

• The burner ignites and heats the water to create steam

• The steam is then released through a valve to power machinery

• The boiler is monitored for pressure and temperature to ensure safe operation

There are various types of boilers used in different industries and applications.

• Fire-tube boilers: Water is heated inside the tubes and hot gases pass through the tubes.

• Water-tube boilers: Water flows through tubes and hot gases surround them.

• Electric boilers: Heat is generated by electric resistance heating elements.

• Package boilers: Pre-designed and assembled units for easy installation.

• Condensing boilers: Recover heat from flue gases to increase efficiency.

• Industrial boile...read more

A boiler is a closed vessel in which water or other fluid is heated.

• Boilers generate steam or hot water for heating and power generation.

• They come in various sizes and designs, including fire-tube, water-tube, and electric boilers.

• Boilers require regular maintenance to ensure safety and efficiency.

• Boiler operators are responsible for monitoring and maintaining boiler systems.

• Examples of industries that use boilers include power generation, manufacturing, and healthcare.

A deaerator is a device used to remove dissolved gases, such as oxygen, from feedwater in a boiler system.

• Deaerators help prevent corrosion in the boiler system by removing dissolved gases that can cause pitting and scaling.

• They also help improve the efficiency of the boiler by reducing the amount of oxygen in the feedwater, which can cause oxygen pitting and boiler tube failures.

• Deaerators typically consist of a storage tank, a deaeration section, and a vent system.

• Feedwater...read more

Wet scrubber is a device used to remove pollutants from industrial exhaust gases.

• It uses water or other liquids to capture and remove pollutants from the gas stream.

• The liquid absorbs the pollutants and is then removed from the system.

• Wet scrubbers are commonly used in industries such as chemical, pharmaceutical, and power generation.

• Examples of pollutants removed by wet scrubbers include sulfur dioxide, nitrogen oxides, and particulate matter.

• Wet scrubbers can be designed as...read more

Boiler efficiency is a measure of how effectively a boiler converts fuel into usable heat energy.

• Boiler efficiency is expressed as a percentage.

• It is calculated by dividing the energy output of the boiler by the energy input.

• Factors affecting boiler efficiency include fuel type, combustion efficiency, and heat transfer efficiency.

• Improving boiler efficiency can lead to cost savings and reduced environmental impact.

• For example, a boiler with 80% efficiency means it converts 80...read more

There are various types of boilers and different types of boiler mountings are used depending on the type of boiler.

• Types of boilers include fire tube, water tube, and electric boilers.

• Boiler mountings include safety valves, water level indicators, pressure gauges, and blowdown valves.

• The type of boiler and its application determine the type of boiler mounting used.

• For example, a fire tube boiler may have a different set of mountings compared to a water tube boiler.

Safety valve and NRV are important safety devices in a boiler system.

• Safety valve is used to release excess pressure in the boiler to prevent explosions.

• NRV (Non-Return Valve) is used to prevent backflow of water or steam in the system.

• Safety valve should be tested regularly to ensure proper functioning.

• NRV should be installed in the correct direction to prevent backflow.

• Both safety valve and NRV are required by law in most countries to ensure safe operation of boilers.

Na3PO4 is used as a pH buffer in boilers while DM water is used to prevent scaling and corrosion.

• Na3PO4 is added to boiler water to maintain a pH level between 10 and 11, which helps prevent corrosion and scaling.

• DM water, or deionized water, is used in boilers to prevent scaling and corrosion by removing minerals and impurities.

• Using DM water in combination with Na3PO4 can help maintain a clean and efficient boiler system.

Economiser and APH are used in boilers to increase efficiency and reduce emissions.

• Economiser preheats the feed water using exhaust gases, reducing fuel consumption.

• APH (Air Preheater) preheats the combustion air, reducing fuel consumption and emissions.

• Both are commonly used in large industrial boilers.

• Economiser can increase efficiency by up to 5%.

• APH can increase efficiency by up to 2% and reduce emissions by up to 20%.

Maintenance of machines is crucial for their efficient and safe operation.

• Regularly inspect machines for wear and tear

• Perform routine maintenance tasks such as lubrication and cleaning

• Address any issues promptly to prevent further damage

• Keep accurate records of maintenance performed

• Train operators on proper use and maintenance of machines