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BOE MCQs with Explanations Topic: Boiler Drum Level Fluctuation (Shrink & Swell) 1. Boiler drum level fluctuation is mainly due to: A. Feedwater pump failure B. Shrink and swell phenomenon C. Steam separator design D. Economizer choking ✅ Correct Answer: B Explanation: Shrink and swell are dynamic effects caused by pressure changes inside the drum during load variation. They give apparent level change without actual change in water mass . 2. Swell in a boiler drum occurs when: A. Steam demand decreases B. Boiler pressure increases C. Steam demand increases suddenly D. Feedwater temperature decreases ✅ Correct Answer: C Explanation: Sudden increase in steam demand reduces drum pressure. Steam bubbles expand, causing apparent rise in drum level , called swell . 3. Shrink phenomenon is caused by: A. Expansion of steam bubbles B. Collapse of steam bubbles C. Excess feedwater D. Boiler blowdown ✅ Correct Answer: B Explanation: When steam demand decreases, pressure increases. Steam b...

BOE Exam Study Material – Complete Guide with Solved Papers, Books & Question Papers (PDF) Preparing for the BOE (Boiler Operation Engineer) Examination requires the right study material , previous year solved papers , and exam-oriented books . Many aspirants search for BOE exam study material PDF , BOE exam solved papers PDF 2021 , BOE exam books PDF free download , and Gujarat BOE exam solved papers PDF to strengthen their preparation. This detailed guide explains what study material you need , how to use solved papers effectively , and where to focus for scoring high marks in the BOE Exam . What is BOE Exam Study Material? BOE Exam study material includes: Syllabus-wise theory notes Previous year BOE exam question papers BOE exam solved papers (with answers) Reference BOE exam books Short notes for last-minute revision A well-structured study plan using authentic BOE material helps candidates clear the exam confidently. BOE Exam Syllabus Coverage (Core Subjects...

 1.Junction valve is used to ? a) Regulate flow of steam b) Regulate water supply c) Put off fire in the furnace d) Indicate water level in the boiler Ans. a 2. If the value of poisson's ratio is zero, then it means that ? a) The material is rigid b) The material is perfectly plastic c) There is no longitudinal strain in the material d) None of these Ans. a 3. Maximum heat is lost in the boiler due to ? a) Unburnt carbon  b) Flue gases c) Incomplete combustion d) Moisture in fuel Ans. b 4. Latent heat of vaporization at critical point is ? a) Less than zero b) Greater than zero c) Equal to zero d) None of the above Ans. c 5. The specific volume of water when heated at 0 deg. C is ? a) First increase and then decrease b) First decrease and then increase c) Increase steadily d) Decrease steadily Ans. d 6. The draught produced by steel chimney as compared to that produced by brick chimney for the same height ? a) Less b) More c) Same d) Can't determine Ans. b 7. For maximum disch...

 1. Main objective of boiler trial is ? a) To determine the generating capacity of the boiler b) To determine the thermal efficiency of the boiler, when working at a definite pressure c) To prepare heat balance sheet for the boiler d) All of the above Ans. d 2. Device used to put off fire in the furnace of the boiler, when the level of water in the boiler falls to an unsafe limit, is ? a) Safety valve b) Fusible plug c) Blow off cock d) Stop valve Ans. b 3. The shell of the cochran boiler is made hemispherical ? a) To provide maximum strength and space b) To withstand high pressure inside c) Both ( a ) and ( b ) d) None of these Ans. c 4. The dryness fraction of steam within a turbine is not allowed to fall below ? a) 0.5 b) 0.9 c) 0.95 d) 0.99 Ans. b 5. With increase in pressure ? a) Enthalpy of dry saturated steam increase b)  Enthalpy of dry saturated steam remains same c)  Enthalpy of dry saturated steam decreases d)  Enthalpy of dry saturated steam first increas...

 1 . Which of the following is NOT a feature of a good boiler? a) Light in weight b) Steam production rate should be as per requirement c) Capable of quick starting d) Water and gas circuits should be such as to allow maximum fluid velocity Ans. d 2. What is lagging? a) The formation of steam bubbles on the surface of water b) Blocks of asbestos or magnesia insulation wrapped on the outside of a boiler shell c) The deposit of medium to extreme hardness occurring on water heating surfaces d) Heat insulation material Ans. b 3. According to boiler terminology, the removal of the mud and other impurities of water from the lowest part of the boiler is termed as _____ a) lagging b) blowing off c) waste removal d) foaming Ans. b 4. Which of the following according to boiler terminology, is the term used for the deposition of medium to extreme hardness occurring on water heating surfaces because of undesirable condition in the boiler water? a) Refractory b) Foaming c) Scale d) Lagging Ans....

  1. Stationary boilers are used for _____ a) locomotive applications b) temporary applications c) power plant steam generation d) marine application Ans. c 2. Which of the following is a single tube boiler? a) Cornish boiler b) Lancashire boiler c) Benson boiler d) Cochran boiler Ans. a 3. Which of the following is NOT true about Babcock and Wilcox boiler? a) Water tube boiler b) Externally fired c) High pressure boiler d) Single tube Ans. d 4. Which of the following is NOT a forced circulation boiler? a) Velox boiler b) Lancashire boiler c) Lamont boiler d) Benson boiler Ans. b 5. Which of the following statement is TRUE about fire tube and water tube boilers? a) Fire tube boilers have high risk of bursting than water tube boilers b) Water tube boilers have high risk of bursting than fire tube boilers c) Bursting of boilers isn’t possible d) It depends upon the quality of water fed to the boiler Ans. b 6. Which of the following statement is FALSE about boilers? a) Portable boiler...

 Boiler Operation Engineer (BOE) Question And Answer Set - 46 1. What purpose do baffle plates serve in a Babcock and Wilcox boiler? a) They direct the flow of water b) They direct the flow of steam c) They direct the flow of hot gases d) They direct the flow of air to combustion chamber Ans. c 2. Stirling boiler is _____ a) a fire tube boiler b) a bent-tube (water tube) boiler c) a horizontal straight tube (water tube) boiler d) a high pressure boiler Ans. b 3. Which of the following statements is FALSE for a cross drum Babcock and Wilcox boiler? a) The alignment of boiler drum is different in cross drum and longitudinal drum boilers b) Any number of connecting tubes can be used c) Steam of pressure 100 bar could be generated d) Steam capacity is 45000 kg/hr Ans. d 4. In Babcock and Wilcox boiler, just before entering the superheater the steam enters _____ a) uptake header b) down take header c) main stop valve d) anti priming pipe Ans. d 5. What is the maximum steam capacity of a...