Power Plant Guruji

 Boiler Operation Engineer Interview Question - 21 Q.1 What are the salts present in the raw water ?  Ans.  a) Calcium Chloride  b) Magnesium Chloride c) Calcium Sulphate d) Magnesium Sulphate e) Calcium Bicarbonate f) Magnesium Bicarbonate Q.2 Where the salts are removed ?  Ans.  Weak Acid Cation Bed - Temporary hardness causing salts in water are removed such as Calcium Bicarbonate, Magnesium Bicarbonate. Strong Acid Cation Bed - Permanent hardness causing salts in the raw water are removed.  The salts are Calcium Chloride, Magnesium Chloride, Calcium Sulphate, Magnesium Sulphate.  Q.3 What are all the other places where the salt is removed ? Ans.  a) Mixed Bed Unit b) Boiler drum by CBD Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for

 Boiler Operation Engineer Interview Question - 20 Q. How do you reduce the auxiliary power consumption of Boiler? Ans.  1. Maintain proper air fuel mixture so that speed of ID, FD fans and fuel feeding system can be optimised. 2. Avoid using high moisture coal as it requires more air for combustion. 3. Use VFD to fuel feeding system. 4. If boiler is running on load less than <30% shutoff the stand by fans. 5. Tune the feed water control valve for maximum opening to reduce the speed of Boiler feed pump. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Important Steam Blowing Questions Asked In Central BOE I

 Boiler Operation Engineer Interview Question - 19 Q. Why do high pressure Boilers have higher efficiency & lower fuel consumption? Ans.  Because: 1-High pressure boilers have higher saturation temperature.  2-High pressure boilers have higher feed water temperature at economiser inlet.  3-High pressure boiler have lower enthalpy of evaporation (latent heat) will be less.  H = Hf+Hfg + Cps x (Tsup-Tsat) Where, Hf = Enthalpy of liquid at operating pressure Hfg = Latent heat Tsup = Super heated steam temperature Tsat = Saturated temperature of steam Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Important

 Boiler Operation Engineer Interview Question - 18 Q. What are the effects of high and low drum levels? Ans.  High drum level: Results into carryover of water into super heater coils which may damage coils due to high thermal shock. Can damage safety valve seats. Disturbs circulation ratio. Carry over with sharp fall in super heater temperature. Water may enter turbine and serious damages to turbine may occur.  Super Heater deposit and fouling. Turbine Deposit and increase in specific steam consumption. Low drum level may results less steam flow to super heater coils. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler

 Boiler Operation Engineer Interview Question - 16 Q.No-1. Can the blades of FD fan be replaced by  the ID fan blades?  Ans. Yes, but the power consumption will increase and motor will be unnecessarily overloaded. Q.No-2. What is the function of pitch control mechanism? Ans. To vary the blade angle of FD and ID fan, in order to vary the quantity of air flow across the fan by means of hydraulic servomotor. Q.No-3. For what purpose dampers are used and where these are located ? Ans.  a) Dampers are used to start the FD and ID fan at no load condition b) During maintenance to keep it is isolate condition Q.No-4. Which economizer is best one and Why it so ? Ans. Non steaming type economizer is the best one. Reasons   a.) It enhance the natural circulation b.) Effective utilization of heat carried away by the flue gas is recovered for preheating the air in RAPH  c.) Efficiency of the boiler will increase Q.No-5. What is Natural circulation? How it takes place? Ans. It is defined as t

 Boiler Operation Engineer Interview Question - 15 Q. How do you control boiler corrosion rate? Ans. 1. Maintain pH of water in the desired range to control corrosion. 2. 02 in feed water should be controlled within 0.007 ppm, primarily by good deaeration, supplemented by Oxygen scavenger dozing. 3. Condenser leak should be immediately detected and acted upon. 4. DM water storage tank should be properly sealed. 5. Condensers and heaters should be air tight. 6. Proper wet lay up of units during shut downs. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Important Steam Blowing Questions Asked In Central BOE In

 Boiler Operation Engineer Interview Question - 14 Q.How do you identify the leakage of economizer tube ? What is its effect ? Ans.  An economizer tube leakage can be detected by sound or increased make up water requirements. The leak should be investigated at the earliest possible time and the unit to be shut down in a normal manner. Water leaks in the economizer can cause considerable erosion damage to adjacent tubes. Water carried over from an economizer tube leak may lead to cold end corrosion also. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Important Steam Blowing Questions Asked In Central BOE Inte

 Boiler Operation Engineer Interview Question - 13 Q. Why economiser is kept at the top of the boiler ? Ans . In Non steaming economiser, the sensible heat is alone added to the feed water. So that steam free water is produced. To keep up this condition, economiser is kept at the top of boiler i.e. over all the pressure parts. So that the flue gas temperature at the top of boiler i.e., near the economiser will be able to add only sensible heat. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? What is the circulation number in boiler ? Most Important Steam Blowing Questions Asked In Central BOE Interview  How it is been decided that RHS or LHS safety valve o

 Boiler Operation Engineer Interview Question - 12 Q. How it is been decided that RHS or LHS safety valve of steam drum is set at higher pressure ? Ans. It is decided based on the slanting angle of steam, drums & CBD line connection. If drum is aligned horizontally then you can set any side of the Safety valve at higher pressure as there is uniform spreading of sludge in drum. Whereas if drum is slanted (made down)towards right or left from where CBD line is connected then it is needed to set that side safety valve at higher pressure to avoid carryover of sludge into the safety valve if it blows first.  Such sludge will deposit on safety valves disc & seat which again leads into leakages & wrong operation related issues.  So safety valve of such location is always set at higher pressure. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters a

 Boiler Operation Engineer Interview Question - 11 1.What is the purpose of steam blowing? Ans. The purpose of the steam blowing is to remove any foreign materials from steam piping & super heater coils after completion of erection work. 2.What will happen if steam blowing is not done after erection or repair of Boiler? Ans. If steam blowing is not done, considerable damage will happen to the steam lines & other end user applications like steam Turbine, process heat exchangers due to scale, debris & other foreign materials present in the newly erected pipe lines/coils. 3.What is the basis behind steam blowing? Ans.  The basis behind the steam blowing is to create momentum equal to or preferably greater than that during normal operation. This will blow out all the debris from the steam lines.  4.What are the two different methods of steam blowing? Ans.  Puff method & continuous method. In puff method thermal shock is created & in continuous steam blowing, constant st

 Boiler Operation Engineer Interview Question - 8 Question - What is the circulation number in boiler ? Ans . It is defined as "the ratio by weight of water entering in to the steam generating circuit to the weight of steam generated". i.e., number of times the unit weight of water circulated in the tube to get completely converted in to steam. Read More BOE Interview Questions   What are the factors which affect the Natural circulation ? What is the difference between Tower type and Two pass conventional boiler? What parameters are measured during Boiler PG test ? Why the start up vent is used in Boilers? List out the potential reasons for boiler tubes failure ?  What is cold end corrosion in boiler and When it occurs ? Also Read : Boiler Operation Engineer ( BOE ) Previous Year Multiple Choice Questions With Answer Set -1 Boiler Operation Engineer ( BOE ) Previous Year Multiple Choice Questions With Answer Set -2 Boiler Operation Engineer ( BOE ) Previous Year Multiple Cho