Boiler Types: Babcock and Wilcox Water Tube Boiler
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Questions and Answers

What is the angle of inclination of the water tubes in a Babcock and Wilcox water tube boiler?

  • 25°
  • 10°
  • 15° (correct)
  • 20°

    • Where is the feed valve located in a Babcock and Wilcox water tube boiler?

  • Uptake header
  • Drum (correct)
  • Grate
  • Fire door

    • How are the hot gases forced to move in a Babcock and Wilcox water tube boiler?

  • Downwards
  • Vertically
  • Horizontally
  • Upwards (correct)

    • What type of material are the inclined water tubes made of in a Babcock and Wilcox water tube boiler?

    <p>Solid drawn mild steel (D)</p> Signup and view all the answers

    What indicates the level of water in a Babcock and Wilcox water tube boiler?

    <p>Water level indicator (D)</p> Signup and view all the answers

    What purpose does the hand hole in front of each tube serve in a Babcock and Wilcox water tube boiler?

    <p>To inspect and clean tubes (D)</p> Signup and view all the answers

    How many 'U' tubes of steel are generally attached to one pair of headers in Sugden's superheater?

    <p>40 tubes (A)</p> Signup and view all the answers

    What happens to the valves when the steam is passed through the superheater?

    <p>V1 is closed, V2 and V3 are opened (D)</p> Signup and view all the answers

    What controls the path of gases in Sugden's superheater?

    <p>Damper (C)</p> Signup and view all the answers

    In what conditions can steam be available from a boiler?

    <p>Wet, dry, or superheated (C)</p> Signup and view all the answers

    What type of boiler is associated with Sugden's superheater?

    <p>Lancashire boiler (A)</p> Signup and view all the answers

    How are the steel 'U' tubes arranged in Sugden's superheater?

    <p>In groups of four (B)</p> Signup and view all the answers

    What is the purpose of the antipriming pipe in a boiler system?

    <p>To ensure a steady flow of steam into the superheater tubes (B)</p> Signup and view all the answers

    How does a Babcock Wilcox water tube boiler with a cross drum differ from one with a longitudinal drum?

    <p>The cross drum allows unlimited connections to tubes circumferentially, while the longitudinal drum has limitations. (D)</p> Signup and view all the answers

    What is the function of the baffle in the steam drum of a Stirling water tube boiler?

    <p>To prevent impurities from entering the steam space (C)</p> Signup and view all the answers

    What role does the mud drum play in a Stirling water tube boiler?

    <p>To collect mud particles and impurities from the water (A)</p> Signup and view all the answers

    Why are brick-wall baffles used in a boiler system?

    <p>To direct combustion products and ensure proper circulation (D)</p> Signup and view all the answers

    What is a notable advantage of bent tube boilers over straight tube boilers?

    <p>They are lighter and more flexible in construction (C)</p> Signup and view all the answers

    How does the feed water move through a Stirling water tube boiler from the steam drum to the mud drum?

    <p>Through rearmost water tubes at the backside (A)</p> Signup and view all the answers

    What is the function of the manhole provided at each end of the drum in a Stirling water tube boiler?

    <p>To facilitate cleaning and maintenance operations (A)</p> Signup and view all the answers

    What is the main reason why scotch type marine boilers are popular?

    <p>They have a high steaming capacity (D)</p> Signup and view all the answers

    Why are shell boilers preferred for applications requiring steam at pressures below 30 bar?

    <p>They are cheaper than water tube boilers (A)</p> Signup and view all the answers

    What is a unique feature of high pressure boilers related to the type of tubing used?

    <p>Arrangement to reduce pressure loss (C)</p> Signup and view all the answers

    Which modern high pressure boiler feature helps increase the heat transfer process?

    <p>Mixing superheated steam with water (B)</p> Signup and view all the answers

    What is the main advantage of water tube boilers over shell boilers for high pressure applications?

    <p>Better control over steam quality (A)</p> Signup and view all the answers

    In high pressure boiler plants, what is the primary method used for water circulation?

    <p>Forced circulation using pumps (A)</p> Signup and view all the answers

    What is the main limitation of using natural circulation in high pressure boiler plants?

    <p>Limited to sub-critical boilers (D)</p> Signup and view all the answers

    What is a key advantage of high-pressure boilers over low-pressure boilers in terms of steam temperature?

    <p>High-pressure boilers can achieve higher maximum steam temperatures. (D)</p> Signup and view all the answers

    What is the main difference between a single-acting pump and a double-acting pump?

    <p>The water is displaced by both sides of the piston in a double-acting pump. (B)</p> Signup and view all the answers

    How are the feed pumps in a duplex direct-acting steam pump powered?

    <p>Powered by small steam turbines (D)</p> Signup and view all the answers

    What is the function of an injector in a boiler system?

    <p>To feed water into the boiler using steam pressure (A)</p> Signup and view all the answers

    What does an economiser do in a boiler system?

    <p>It converts waste heat from flue gases to heat the feed water. (C)</p> Signup and view all the answers

    How does a double feed pump differ from a rotary feed pump?

    <p>Double feed pumps utilize centrifugal force, whereas rotary feed pumps are driven by steam. (B)</p> Signup and view all the answers

    Why is an injector not suitable for large capacity high-pressure boilers?

    <p>Irregular operation under extreme steam pressure variations (D)</p> Signup and view all the answers

    What type of boiler has a dome-shaped top and a hemispherical crown providing maximum volume of space?

    <p>Cochran boiler (D)</p> Signup and view all the answers

    Why are hand-holes provided at the ends of each cross tube in boilers?

    <p>To give access for cleaning (C)</p> Signup and view all the answers

    In which type of boiler does the sediment in water fall to the bottom, away from the hottest portion of furnace gases?

    <p>Cornish boiler (D)</p> Signup and view all the answers

    What is the purpose of the manhole in a boiler?

    <p>To clean interior and exterior (D)</p> Signup and view all the answers

    Which feature makes the Lancashire boiler commonly used in sugar mills and textile industries?

    <p>Ease of operation (C)</p> Signup and view all the answers

    How are the combustion gases directed to pass through a number of horizontal tubes in the Cochran boiler?

    <p>By fire brick lining (B)</p> Signup and view all the answers

    What is the purpose of the fire bridge in a locomotive boiler?

    <p>To prevent entry of burning coal and ashes into the furnace tubes (A)</p> Signup and view all the answers

    In a locomotive boiler, what is the function of the superheater tubes?

    <p>To transmit heat from hot gases into the water through the heating surface of the fire tubes (D)</p> Signup and view all the answers

    What is the main function of a steam dome in a locomotive boiler?

    <p>To collect steam over the water surface (B)</p> Signup and view all the answers

    Why can't natural draught be obtained in a locomotive boiler?

    <p>It requires a very high chimney which cannot be provided on a locomotive boiler (A)</p> Signup and view all the answers

    What purpose does the blast pipe serve in a locomotive boiler?

    <p>To produce a correct draught by using exhaust steam from the cylinders (A)</p> Signup and view all the answers

    What are some common boiler mountings mentioned for a locomotive boiler?

    <p>Pressure gauge, water level indicator, man hole, feed check valve (D)</p> Signup and view all the answers

    What is one of the demerits mentioned for a locomotive boiler?

    <p>Chances of corrosion and scale formation in water legs due to sediment accumulation (A)</p> Signup and view all the answers

    Why are pumps used in high-pressure boilers?

    <p>To maintain forced circulation of water (D)</p> Signup and view all the answers

    What is a key advantage of using small diameter tubes in large numbers in high-pressure boilers?

    <p>Utilizing the heat of combustion more efficiently (D)</p> Signup and view all the answers

    What is a major problem faced in LaMont boilers due to salt and sediment deposition?

    <p>Decreased generating capacity (D)</p> Signup and view all the answers

    How is feed water evaporated in a Loeffler boiler?

    <p>By means of superheated steam from the superheater (A)</p> Signup and view all the answers

    What is a distinguishing feature of Loeffler boilers compared to other types?

    <p>Ability to carry higher salt concentrations (D)</p> Signup and view all the answers

    Which type of pump is commonly used as a feed pump in steam boilers according to the text?

    <p>Reciprocating pump (C)</p> Signup and view all the answers

    Why are multiple steam drums not required in high-pressure boilers?

    <p>To increase evaporative capacity (B)</p> Signup and view all the answers

    What does pressurised combustion do in terms of fuel firing rate?

    <p>Increases the rate of firing of fuel (C)</p> Signup and view all the answers

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