Power Plant Guruji

 Q 1. What are the difference between c onvective superheaters and r adiant superheaters? Ans.  Convective superheaters receive heat from flue gases. Radiant superheaters are placed in the furnace. The wall tubes of radiant superheater receive heat from the burning fuel through radiant process. Radiant superheaters are usually used where the steam is to be raised to a high superheat temperature. Q 2. What is the function of  a steam separator? Ans.  The function of a steam separator is to reduce the wetness of the steam by removing the water particles from the steam before it enters the steam turbine or engine. It is installed on the main pipe delivering the steam as close as possible to the engine. Q 3. T ypes of steam separator? Ans.  On the basis of principle of operation steam separators are classified into baffle or impact type, reverse current type and centrifugal type. There is a loss of heat in the steam pipe after the steam leaves the boiler which produces wetness. This wetnes

 1 . What is the maximum working pressure of a Lancashire boiler? a) 10 bar b) 12 bar c) 14 bar d) 16 bar Ans. d 2. In Lancashire boiler, an arrangement is made so that burning coal and ashes do not enter the furnace tubes. What is that arrangement called? a) Low brickwork fire bridge b) Ash-filter c) Filtering mesh d) Furnace separator Ans. a 3. How many fire tubes (Furnace tubes) does a Lancashire boiler has? a) One b) Two c) Three d) Four Ans. b 4. What is the function of dampers in Lancashire boiler? a) They control the flow of hot gases to the chimney b) They regulate the fire in the furnace c) They control the flow water to the boiler d) They control the steam going out of the boiler Ans. a 5. Which of the following is the correct range of the diameter of shell for a Lancashire boiler? a) 1 to 2 m b) 2 to 3 m c) 3 to 4 m d) 4 to 5 m Ans. b 6. Which of the following statements is TRUE about Lancashire boiler? a) The length of its shell is about 10 m b) It has a steam capacity of 1

 Q 1, What is  Boiler Accessories? Ans.  Boiler accessories are auxiliary plants that help in proper operation of the boiler and also increase its efficiency. Feed pumps, injector, superheater, air preheater, economizer, superheater are some commonly used boiler accessories. Q 2. Purpose of boiler feed pump used in boiler? Ans.  Feed pump is used to deliver feed water to the boiler. Reciprocating pump and rotary pump are the commonly used feed pumps. Reciprocating pump is classified into single acting and double acting pump. Q 3. In single and  double acting reciprocating pump,  water is displaced by? Ans.  In a double acting reciprocating pump, water is displaced by both side of the piston. This is the reason why water is discharged in each stroke. In case of single acting pump water is displaced be only one side of the piston and hence water is discharged in alternate strokes. Q 4. Injector is used in which type of boiler? Ans. Injector is used to feed water into a boiler. It is used

 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. c 5

Q  1. What is the function of fusible plug? Ans.  Overheating damage to the boiler is prevented by fusible plug. Overheating occurs when water level is low. It Is fitted above the fire box. When water level falls below the level of fusible plug, it is exposed to steam and it melts. Steam and water rush to the fire box and extinguish the fire which prevents overheating of boiler. Q 2. A  fusible plug  melting point? Ans.  The melting point of fusible plug should be less than the temperature of the steam getting generated, since the fusible plug is supposed to melt when it comes in contact with the steam. Fusible plugs should usually be replaced after a period of about 2 years. Q 3.  In fusible plug, the fusible metal is protected? Ans.  The fusible metal is to be melted only by the steam and not by the hot gases released from the combustion in the fire box. The fusible metal is therefore protected from fire by flange on the hollow gun metal plug. Q 4. Purpose of  blow-off cock  in boile

  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 boilers ar