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

What is the purpose of hand holes provided at the ends of cross tubes in a boiler?

  • To allow for efficient circulation of water
  • To facilitate the escape of combustion gases
  • To provide access for cleaning the tubes (correct)
  • To increase the heating surface area
  • In a Cochran boiler, where are the combustion gases directed after passing through the horizontal fire tubes?

  • Fire brick lining
  • Chimney (correct)
  • Flue tube
  • Smoke box
  • What is the advantage of a Cornish boiler design in terms of sediment contained in water?

  • Sediment does not affect boiler efficiency
  • Sediment is kept in suspension in the water
  • Sediment falls to the bottom away from hottest gases (correct)
  • Sediment is directed to the combustion chamber
  • What is the reason for carrying combustion gases first through side flues and then through the bottom flue in a Cornish boiler?

    <p>To prevent overheating of the bottom plates (B)</p> Signup and view all the answers

    Which type of boiler is commonly used in sugar-mills and textile industries due to its simplicity and reliability?

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

    What is located inside the cylindrical shell of a Lancashire boiler?

    <p>Large tubes (D)</p> Signup and view all the answers

    Which mountings are common to both Cochran and Cornish boilers?

    <p>Steam stop valve and water gauge (A)</p> Signup and view all the answers

    What is the purpose of a manhole in a boiler?

    <p>For cleaning purposes (C)</p> Signup and view all the answers

    What advantage does a simple vertical boiler have in terms of transportation?

    <p>It is self-contained and can be easily transported (D)</p> Signup and view all the answers

    What does the crown of a Cochran boiler provide due to its hemispherical shape?

    <p>Maximum volume of space for steam (B)</p> Signup and view all the answers

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

    <p>To prevent priming in the steam (B)</p> Signup and view all the answers

    Why are metallic slings or girders used to hang the boiler?

    <p>To prevent expansion and contraction (C)</p> Signup and view all the answers

    What distinguishes a Babcock Wilcox water tube boiler with cross drum from a longitudinal drum boiler?

    <p>Number of tubes connected to one drum (D)</p> Signup and view all the answers

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

    <p>To deflect water downwards into the drum (D)</p> Signup and view all the answers

    Why are manholes provided at each end of the drums in a Stirling water tube boiler?

    <p>For cleaning operation (C)</p> Signup and view all the answers

    How does a fire brick arch contribute to combustion in a boiler?

    <p>By helping prevent chilling when fire door is opened (C)</p> Signup and view all the answers

    What is the purpose of the chimney in a boiler system?

    <p>To discharge combustion products (A)</p> Signup and view all the answers

    How do bent tube boilers differ from straight tube boilers?

    <p>&quot;Bent tube boilers are more flexible but harder to clean compared to straight tube boilers&quot; (A)</p> Signup and view all the answers

    What is the purpose of the furnace tubes in the boiler?

    <p>To pass combustion products through them (C)</p> Signup and view all the answers

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

    <p>To return steam to the superheated steam chamber (B)</p> Signup and view all the answers

    What is the role of the fire brick arch in a locomotive boiler?

    <p>To heat the walls of the fire box properly (B)</p> Signup and view all the answers

    Why is natural draught not achievable in a locomotive boiler?

    <p>Requires a very high chimney (B)</p> Signup and view all the answers

    What are some boiler mountings typically found on a locomotive boiler?

    <p>Safety valves and pressure gauge (B)</p> Signup and view all the answers

    Why is low brickwork fire bridge placed at the back of the gate in boilers?

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

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

    <p>Fits over the barrel to collect steam (A)</p> Signup and view all the answers

    In a locomotive boiler, where is the ash pit located?

    <p>Below the fire box (D)</p> Signup and view all the answers

    What is one of the demerits associated with a locomotive boiler design?

    <p>Difficult to clean some water spaces (D)</p> Signup and view all the answers

    Why are fire tubes surrounded by water in a locomotive boiler?

    <p>To transmit heat into water (A)</p> Signup and view all the answers

    What is the main function of pumps in high pressure boilers?

    <p>Maintain forced circulation of water (A)</p> Signup and view all the answers

    In a Lamont boiler, what maintains the circulation of water?

    <p>Centrifugal pump (D)</p> Signup and view all the answers

    How is the issue of salt deposition addressed in a Loeffler boiler?

    <p>By preventing water flow into the tubes (D)</p> Signup and view all the answers

    What is the primary purpose of the economiser in a steam boiler?

    <p>To heat water before it enters the superheater (B)</p> Signup and view all the answers

    What is the advantage of using small diameter tubes in high-pressure boilers?

    <p>Increased rate of heat release (C)</p> Signup and view all the answers

    What is the novel principle used in a Loeffler boiler?

    <p>Evaporating feed water using superheated steam (B)</p> Signup and view all the answers

    Why are Loeffler boilers suitable for land or sea transport power generation?

    <p>Can carry higher salt concentrations (B)</p> Signup and view all the answers

    What is a key benefit of pressurized combustion in high-pressure boilers?

    <p>Higher rate of heat release (D)</p> Signup and view all the answers

    In a Lamont boiler, where is the feed water drawn from?

    <p>Economiser (B)</p> Signup and view all the answers

    What is the main purpose of using a superheater in a steam boiler?

    <p>To increase the temperature of steam (B)</p> Signup and view all the answers

    What is the function of Sugden's superheater?

    <p>To increase the temperature of steam above its saturation value (A)</p> Signup and view all the answers

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

    <p>Ten (B)</p> Signup and view all the answers

    What happens to the steam when the valve V1 is closed and valves V2 and V3 are opened?

    <p>Steam is directed to the main steam pipe (D)</p> Signup and view all the answers

    How is the path of gases controlled in the system described?

    <p>By operating the hand wheel (A)</p> Signup and view all the answers

    Which component ensures that the steam available from a boiler is either wet, dry, or superheated?

    <p>The steam separator (B)</p> Signup and view all the answers

    What happens when the steam is taken from the boiler direct to the main steam pipe according to the description?

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

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

    <p>Single-acting pumps have one side of the piston displace water, while double-acting pumps have both sides displace water. (A)</p> Signup and view all the answers

    How is the reciprocating feed pump continuously operated in a steam pump system?

    <p>It is run by steam from the same boiler it feeds. (D)</p> Signup and view all the answers

    What type of pump is commonly employed for medium-sized boilers?

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

    What does a rotary feed pump utilize for pumping liquid?

    <p>Centrifugal force of a rotating impeller (A)</p> Signup and view all the answers

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

    <p>To combine steam and water for increased pressure (D)</p> Signup and view all the answers

    What are the advantages of using an injector for feeding water into a boiler?

    <p>'Low initial cost', 'simplicity', 'compactness', 'ease of operation' (D)</p> Signup and view all the answers

    What type of device utilizes waste heat from flue gases to heat feed water in a boiler system?

    <p>'Economiser' (B)</p> Signup and view all the answers

    What is the purpose of an economiser in a boiler system?

    <p>'To utilize waste heat from flue gases for heating feed water' (C)</p> Signup and view all the answers

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

    <p>To increase the temperature of air before it enters the furnace (B)</p> Signup and view all the answers

    Where is the air preheater generally placed in relation to the economiser?

    <p>After the economiser (D)</p> Signup and view all the answers

    What is the purpose of a superheater in a boiler system?

    <p>To increase the temperature of steam above its saturation point (A)</p> Signup and view all the answers

    Why are scrapers used in an economiser?

    <p>To prevent soot deposit on pipes (D)</p> Signup and view all the answers

    How does an air preheater facilitate combustion in a boiler system?

    <p>By preheating the air to be supplied to the furnace (B)</p> Signup and view all the answers

    Which type of superheater makes use of heat from flue gases?

    <p>Convective superheater (D)</p> Signup and view all the answers

    In a superheater, where is a radiant superheater typically placed to receive heat?

    <p>In the furnace and wall tubes (A)</p> Signup and view all the answers

    What happens to gaseous products of combustion after leaving an air preheater?

    <p>They escape to the atmosphere through a stack (C)</p> Signup and view all the answers

    What leads to an increase in evaporative capacity of a boiler with an economiser?

    <p>Reduction of temperature range between boiler parts (A)</p> Signup and view all the answers

    What is prevented by keeping external surfaces of pipes clean with scrapers in an economiser?

    <p>Increase in soot deposit on pipes (A)</p> Signup and view all the answers

    What is the minimum pressure requirement for using Babcock and Wilcox water tube boiler?

    <p>10 bar (C)</p> Signup and view all the answers

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

    <p>15° (C)</p> Signup and view all the answers

    What is the function of baffle plates in a Babcock and Wilcox water tube boiler?

    <p>To direct hot gases between tubes (A)</p> Signup and view all the answers

    How is the flow of water inside a Babcock and Wilcox water tube boiler from the drum to the shell described?

    <p>Circulatory (B)</p> Signup and view all the answers

    Where does the steam get collected in a Babcock and Wilcox water tube boiler?

    <p>In the steam space of the drum (C)</p> Signup and view all the answers

    What is the main advantage of shell boilers over water tube boilers?

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

    Which type of boiler is generally preferred for high pressure and high output applications?

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

    What is the purpose of a combustion chamber in a Scotch boiler?

    <p>To transfer heat to water (C)</p> Signup and view all the answers

    In high pressure boilers, what method is commonly used to maintain water circulation?

    <p>Forced circulation with a pump (A)</p> Signup and view all the answers

    What is the purpose of exposing water tubes to flue gases in high pressure boilers?

    <p>Enhancing heat transfer (C)</p> Signup and view all the answers

    How do high pressure boilers utilize superheated steam for heating water?

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

    What distinguishes water tube boilers from shell boilers in terms of geometry?

    <p>Smaller diameter pressure parts (D)</p> Signup and view all the answers

    "U" tube systemis employed in which part of a high-pressure boiler?

    <p>Water circulation (A)</p> Signup and view all the answers

    Why are shell boilers generally preferred over water-tube boilers for applications below 30 bar pressure?

    <p>Cost-effectiveness (B)</p> Signup and view all the answers

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