Good quality of your website.
BOILER INTERVIEW QUESTION & ANSWER

BOILER INTERVIEW QUESTION & ANSWER
Today we discussed about some multiple choice questions and answer related to power plant these questions are very helpful for which do preparation for B.O.E ( BOILER OPERATION ENGINEER ) EXAM. and also for ENERGY MANGER EXAM , and also for those people which prepared for interview .
Q.(A).What is the affect of sulfur in coal when used in boiler?
Sulfur will get oxidized to SO2 and fraction of SO3 and will react with water to form sulfuric acid and this occurs at a temperature called the acid dew point which normally is about 120 oC. The sulfuric acid so formed corrodes the steel when it comes in contact with it.
Q.(B).What do you mean by IBR steam boiler.
IBR Steam Boilers means any closed vessel exceeding 22.75 liters in capacity and which is used expressively for generating steam under pressure and includes any mounting or other fitting attached to such vessel,which is wholly or partly under pressure when the steam is shut off.
Q (B.1)What do you understand by ‘water tube boilers’ and ‘fire tube boilers’?
In water tube boilers the water passes through the tubes and the hot gases passes out side the tubes where as in case of fire tube boiler the hot gases passes through the tubes and the water passes over the tubes
Q(C).What are the parameters required to estimate the boiler efficiency by ‘direct method’?
- a) Steam flow rate
- b) GCV of fuel
- c) Fuel flow rate
- d) Steam conditions ( pressure and temperature)
- e) Feed water temperature
Q (D).Why boiler blow-down is required?
As the feed water evaporate into steam, dissolved solids concentrate in the boiler. Above certain level of concentration, these solids encourage carryover of water into steam. This leads to scale formation inside the boiler, resulting in localized over heating and ending finally in tube failure. Hence blow-down is very much required for boilers.
Q (E).What is the principle of mechanical deaeration (pressure type) of boiler feed water?
The pressure-type de-aerators operates by allowing steam into the feed water through a pressure control valve to maintain the desired operating pressure, and hence temperature at a minimum of 105 °C. The steam raises the water temperature causing the release of O2 and CO2 gases that are then vented from the system. This type can reduce the oxygen content to 0.005 mg/litre.
Q (F).What is the effect of boiler loading on boiler efficiency?
- The maximum efficiency of the boiler does not occur at full load, but at about two-thirds of the full load. If the load on the boiler decreases further, efficiency also tends to decrease.
- As the load falls, so does the value of the mass flow rate of the flue gases through the tubes. This reduction in flow rate for the same heat transfer area, reduced the exit flue gas temperatures by a small extent, reducing the sensible heat loss.
- Below half load, most combustion appliances need more excess air to burn the fuel completely. This increases the sensible heat loss.
OUR OTHER ARTICLE WHICH YOU CAN ENJOY ALSO I PROMISE YOU SHOULD GAIN LOT OF INFORMATION FROM THESE
BOILER
Advantages of Fluidized Bed Combustion Boilers
10 common causes of carry over in power plant
AFBC ( Atmospheric Fluidized Bed Combustion ) BOILER COLD START UP PROCEDURE
CFBC boiler process and their advantage over AFBC boiler
Correct procedure for water filling in boiler
12 important things should know during boiler walk down check up
CFBC (circulating fluidization bed combustion )BOILER PRESSURE PART’S & THEIR FUNCTION
CAUSE OF BOILER TUBE FAILURE –बॉयलर ट्यूब पंक्चर होने के मुख्य कारण
FBC ADVANTAGE OVER CHAIN GRATE STOKER BOILER
BOILER FIRST CLASS ATTENDANT JOB RESPONSIBILITY
Best waste minimization techniques for any industry
BOILER’S DEAERATOR WORKING / OPERATION
Boiler feed pump for power plant operation
Causes for the pump vibrations
What is the pump cavitation? Is there any hazards? And how to prevent cavitation?
BOILER STEAM DRUM SAFETY VALVE
Emergency shutdown of waste heat boiler
What is Boiler ? and their classification.
BOILER REFRACTORY MATERIAL AND THERE REQUIREMENTS
How to calculate boiler efficiency by Direct Method ?
Globe valve for power plant industries
Gate valve for power plant industries
Control Valve for power plant industries
Ball valve for power plant industries
HOW TO DO BOILER ALKALI BOIL OUT DURING BOILER COMMISSIONING
FEED CHECK VALVE FOR POWER PLANT USED
Waste Heat Boilers
POWER PLANT BOILER STEAM DRUM INTERNALS
TURBINE
Woodward 505 governor controlling / operation
Types of cooling towers used in power plants
Calculating performance of Steam Turbine,Overall Plant,Gas Turbine and Heat Recovery Steam Generator (HRSG).
Induced Draft cooling tower for power plant
Why we need condensing turbine vacuumize before cold startup ?
RESIN BEHIND DROPPING CONDENSER VACUUM
FUNCTION OF OIL PUMPS IN TURBINE LUBRICATION SYSTEM
FUNCTION OF EACH OIL PUMP IN TURBINE LUBRICATION SYSTEM
FUNCTION OF STEAM JET EJECTOR IN STEAM TURBINE
Situations in which need to urgently shut down of stem turbine
TURBINE THRUST BEARING AND IT’S FUNCTION
STEAM TURBINE JOURNAL BEARING AND IT’S FUNCTION
Turbine Rotor critical rotation speed
Type of emergency in steam turbine
Function of turbine steam cylinder in turbine operation
Working principal of steam turbine
Classification of the steam turbine
FUNCTION OF GLAND STEAMING IN TURBINE OPERATION
FUNCTION OF LABYRINTH PACKING IN STEAM TURBINE
WATER TREATMENT
INTRODUCTION AND WORKING PRINCIPAL OF REVERSE OSMOSIS
Boiler Water analysis and it’s importance
WATER IMPURITIES AND THEIR CLASSIFICATION
Water impurities and their harmful effects on boiler
Filtration process in water treatment
| Sedimentation Process in water treatment
WORKING PRINCIPAL OF MIX BED
POWER PLANT QUESTION ANSWERS
Best 25 questions and answer for boiler first and second class operator viva examination 2017
POWER PLANT MEDIUM TYPE QUESTION ANSWERS 2017
BOE (BOILER OPERATION ENGINEERING) QUESTIONS AND ANSWERS FOR ALL STATS BOARD
MY BEST TOP 20 POWER PLANT QUESTION ANSWER
TOP 100 MULTIPLE TYPE QUESTION ANSWER FOR BOE EXAMINATION
BOILER INTERVIEW QUESTION & ANSWER
BOILER MULTIPLE TYPE INTERVIEW QUESTION & ANSWER
BOE / FIRST CLASS / 2ND CLASS BOILER OPERATOR USEFUL INFORMATION
BOILER FIRST CLASS EXAMINATION SYLLABUS FOR ALL STATES BOARD 2017
BOE (Boiler Operation Engineer) SYLLABUS 2017
Q (G).What are the principle heat losses that occur in a boiler?
The principle heat losses that occur in a boiler are:
• Loss of heat due to dry flue gas
• Loss of heat due to moisture in fuel and combustion air
• Loss of heat due to combustion of hydrogen
• Loss of heat due to radiation
• Loss of heat due to unburnt fuel
Q (H).What do you meant by tangential firing with respect to pulverized coal fired boiler?
The method of firing used for coal firing in pulverized fuel fired boiler is the tangential firing. In this type of firing four burners are used at the corner to corner to create a fire ball at the center of the furnace.
Q (I).What are the disadvantages of ‘direct method’ of boiler efficiency evaluation over ‘indirect method’?
Direct method
a) Do not give clues to the operator as to why efficiency of system is lower
- b) Do not calculate various losses accountable for various efficiency levels
J.List out the data required for calculation of boiler efficiency using ‘indirect method’.
The data required for calculation of boiler efficiency using indirect method are:
- Ultimate analysis of fuel (H2, O2, S, C, moisture content, ash content)
- Percentage of Oxygen or CO2 in the flue gas
- Flue gas temperature in 0C (Tf)
- Ambient temperature in 0C (Ta) & humidity of air in kg/kg of dry air.
- GCV of fuel in kcal/kg
- Percentage combustible in ash (in case of solid fuels)
- GCV of ash in kcal/kg (in case of solid fuels)
Q (K).Explain the different external water treatment methods.
External treatment is used to remove suspended solids, dissolved solids (particularly the Calcium and Magnesium ions which is a major cause of scale formation) and dissolved gases (oxygen and carbon dioxide). The techniques include Precipitation processes, in which chemicals are added to precipitate calcium and magnesium as compounds of low solubility.
The lime-soda process is typical of this class, but other precipitating agents such as caustic soda and sodium phosphate can be used when the composition of the raw water permits.
Ion-exchange progresses, in which the hardness is removed as the water passes through bed of natural zeolite or synthetic resin and without the formation of any precipitate. Ion exchange processes can be used for almost total demineralization if required, as is the case in large electric power plant boilers.
De-aeration, in which gases are expelled by preheating the water before entering the boiler system. Water normally contains approximately 10 mg/1 of dissolved oxygen at ambient temperature Filtration, to remove suspended solids
Q( L).What are the salient features of a ‘packaged boiler’?
The features of package boilers are:
• Small combustion space and high heat release rate resulting in faster evaporation.
• Large number of small diameter tubes leading to good convective heat transfer.
• Forced or induced draft systems resulting in good combustion efficiency.
• Number of passes resulting in better overall heat transfer.
• Higher thermal efficiency at lower capacity (say below 1 ton) levels compared with other boilers.
Q (M).What are the two main classification of a stoker fired boiler?
1. Chain grate or travelling grate stoker
2. Spreader stoker
Q (N).Briefly explain the principle involved in ‘reverse osmosis’?
When solutions of differing concentrations are separated by a semi-permeable membrane, water from less concentrated solution passes through the membrane to dilute the liquid of high concentration.
If the solution of high concentration is pressurized, the process is reversed and the water from the solution of high concentration flows to the weaker solution.
यदि आप हिंदी में वीडियो के माध्यम से पावर प्लांट की जानकारी लेना चाहते है तो निचे दिए लिंक पर क्लिक करे और हमारे दावरा बनाये गये वीडियो का लुफ्त उठये यदि आप को वीडियो अच्छा लगे तो अपनी राय जरूर दे और हमारे यूट्यूब चैनल को सब्सक्राइब करना मत भूले
TOP 12 TECHNIQUES FOR FINDING BOILER TUBE LEAKAGE DURING RUNNING BOILER [HINDI]
Watch Here: https://youtu.be/8fvpNgp98H0
BOILER QUESTIONS AND ANSWERS FOR 1ST CLASS VIVA- VICE PREPARATION IN [HINDI] BOILER Q & A IN HINDI
Watch Here: https://youtu.be/-wah4KE8XhU
BOILER 1ST CLASS AND 2ND CLASS VIVA – VICE QUESTION AND ANSWER FOR ALL STATE BOARD EXAMINATION
Watch Here: https://youtu.be/v8GDdmPNdoA
TOP 10 BOILER QUESTIONS AND ANSWERS! BOILER INTERVIEW QUESTION AND ANSWER! BOILER QNA
Watch Here: https://youtu.be/3Qc3hNj9RJE
HOW TO CALCULATE BOILER SAFETY VALVE OVER PRESSURE AND BLOW DOWN PERCENTAGE [ HINDI ]
Watch Here: https://youtu.be/4aIeg6H1Tp8
WHAT IS PRIMING, FOAMING AND CARRYOVER IN BOILER OPERATION [ हिंदी ]
Watch Here: https://youtu.be/g1YfWxNzAm8
BOE (BOILER OPERATION ENGINEER) Q & A -PAPER NO. 3 [ENGG. DRAWING] DIFFERENT TYPES VALVE SYMBOLS
Watch Here: https://youtu.be/evfwcm2x_DQ
YOU WANT TO BE A BOILER 2ND CLASS CERTIFIED OPERATOR IN POWER PLANT! BOILER SECOND CLASS EXAM 2019
Watch Here: https://youtu.be/ho59xfwLRWk
YOU WANT TO BE A BOILER FIRST CLASS OPERATOR IN 2019! BOILER FIRST CLASS EXAMINATION 2019
Watch Here: https://youtu.be/RQT6dq-hZig
YOU WANT TO BE A BOE (BOILER OPERATION ENGINEER) IN POWER PLANT! BOILER OPERATION ENGG. EXAMS
Watch Here: https://youtu.be/i2BHSa5wJ5Q
HOW TO CHECK COOLING TOWER PERFORMANCE! FACTORS EFFECTING COOLING TOWER EFFICIENCY!
Watch Here: https://youtu.be/DjzX0gzCksA
HOW TO CALCULATE AFBC (Atmospheric Fluidized Bed Combustion) BOILER BED HIGHT! BOILER BED HIGHT
Watch Here: https://youtu.be/NL4TITQ7prs
WHAT IS STEAM TURBINE WHEEL CHAMBER PRESSURE IN POWER PLANT-HINDI! CURTIS WHEEL CHAMBER PRESSURE
Watch Here: https://youtu.be/vVrp-1pVN_o
SAFE SHUT DOWN OF STEAM TURBINE AFTER TRIPPING [HINDI] SHUT DOWN OPERATION OF STEAM TURBINE
Watch Here: https://youtu.be/_h7v07676TA
SURFACE CONDENSER WATER CALCULATION FOR EXHAUST STEAM COOLING -POWER PLANT GYANI
Watch Here: https://youtu.be/zgdvZ38JA1Q
TOP 22 REASONS BEHIND STEAM TURBINE VIBRATION IN THERMAL POWER PLANT – POWER PLANT GYANI
Watch Here: https://youtu.be/RmxfybGipsQ
TOP 22 REASONS BEHIND STEAM TURBINE VIBRATION IN THERMAL POWER PLANT – POWER PLANT GYANI
Watch Here: https://youtu.be/RmxfybGipsQ
HOW TO CALCULATE STEAM TURBINE HEAT RATE IN THERMAL POWER PLANT! TURBINE HEAT RATE CALCULATION
Watch Here: https://youtu.be/lGNxBq4XBqE
What is the turbine Heat rate? ! How to calculate the heat rate of a steam turbine,
Watch Here : https://youtu.be/jdfwa3xsVGE
BOILER DRUM LEVEL NOT MAINTAINED! HOW TO CONTROL BOILER STEAM DRUM LEVEL IN POWER PLANT
Watch Here: https://youtu.be/y62c3KkYI9M
What is the function of the rupture disc in a steam turbine condenser? ! Function of rupture disc? ,
Watch Here: https://youtu.be/LQ28lmlWN-U
HOW TO LUBE OIL SYSTEM WORKED IN STEAM TURBINE! TURBINE LUBRICATION SYSTEM
Watch Here: https://youtu.be/znE2dj1zaOY
HOW TO CALCULATE CONDENSER EFFICIENCY? WHAT IS SURFACE CONDENSER EFFICIENCY!
Watch Here: https://youtu.be/Xx4lBxqQRDg
FUNCTION OF HOGGER EJECTOR IN STEAM TURBINE! WHAT IS TURBINE HOGGER! TURBINE VACCUM SYSTEM
Watch Here: https://youtu.be/ooVcxaYFHIY
WHAT IS IMPULSE AND REACTION TURBINE! WHAT IS THE DIFFERENCE BETWEEN IMPULSE AND REACTION TURBINE
Watch Here: https://youtu.be/3a4kCYVEpoU
FUNCTION OF THROTTLE VALVE IN STEAM TURBINE OPERATION! STEAM TURBINE CONTROL VALVE! GOVERNOR VALVE
Watch Here: https://youtu.be/oIp_U81kYTI
STEAM TURBINE GLAND SEALING SYSTEM! LABYRINTH SEALING IN STEAM TURBINE! TURBINE GLANDSEALING SYSTEM
Watch Here: https://youtu.be/_WkQpv2q7Vw
STEAM EJECTOR WORKING PRINCIPAL! STEAM TURBINE VACCUM SYSTEM! WORKING OF STEAM EJECTOR
Watch Here: https://youtu.be/Gp36TEMxcAU
WHAT IS AXIAL DISPLACEMENT OF TURBINE! WHAT IS AXIAL DISPLACEMENT! AXIAL SHIFT OF TURBINE
Watch Here: https://youtu.be/uNKOwKEdMds
WHAT IS STEAM EJECTOR? [ हिंदी ] STEAM EJECTOR WORKING! STEAM EJECTOR VACCUM SYSTEM
Watch Here: https://youtu.be/rkNrh1N7nvU
TURBINE HOT AND COLD STARTUP PROCEDURE! STEAM TURBINE HOT AND COLD ROLLING PROCEDURE!
Watch Here: https://youtu.be/skxnJQtRy8E
TURBINE ROLLING PROCESS IN POWER PLANT! HP TURBINE ROLLING PROCEDURE! STEAM TURBINE OPERATION
Watch Here: https://youtu.be/VIKZ7lvAV9Y
HOW TO WORK STEAM TURBINE MECHANICAL HAND TRIP! Turbine Trip Logic! Over Speed Trip Device Turbine
Watch Here: https://youtu.be/pFuIYXPQ0i4
CRITICAL SPEED DEFINITION! Whirling SPEED OF TURBINE! WHAT IS CRITICAL SPEED OF TURBINE
Watch Here: https://youtu.be/FsrAdqKqiT8
WHAT IS WELDING! FACTS ABOUT WELDING ELECTRODES! Welding electrode information!
Watch Here: https://youtu.be/GPUQzKi6gpA
EFFECT OF VACUUM ON STEAM TURBINE PERFORMANCE! TURBINE VACUUM SYSTEM! TURBINE VACUUM DROPPING
Watch Here: https://youtu.be/e_XQMfPqBc0
FUNCTION OF STEAM TURBINE GOVERNING SYSTEM! GOVERNING SYSTEM IN THERMAL POWER PLANT
Watch Here: https://youtu.be/UmjWzdiwFxs
Steam turbine rotor – टरबाइन रोटर की पूरी जानकारी हिंदी में
Watch Here: https://youtu.be/hBW7hZmaKK0
STEAM TURBINE की AUXILIARIES के बारे में जाने
Watch Here: https://youtu.be/P2e6zOY0JvM
Q (O).What are the various methods available to control the ‘excess air’ in a boiler?
Various methods are available to control the excess air:
• Portable oxygen analysers and draft gauges can be used to make periodic readings to guide the operator to manually adjust the flow of air for optimum operation. Excess air reduction up to 20% is feasible.
• The most common method is the continuous oxygen analyzer with a local readout mounted draft gauge, by which the operator can adjust air flow. A further reduction of 10-15% can be achieved over the previous system.
• The same continuous oxygen analyzer can have a remote controlled pneumatic damper positioner, by which the readouts are available in a control room. This enables an operator to remotely control a number of firing systems simultaneously.
Q (P).Describe ‘chain grate’ and ‘spreader stoker’ type boiler.
Chain-Grate or Travelling-Grate Stoker Boiler
Coal is fed onto one end of a moving steel grate. As grate moves along the length of the furnace, the coal burns before dropping off at the end as ash. Some degree of skill is required,
particularly when setting up the grate, air dampers and baffles, to ensure clean combustion leaving the minimum of unburnt carbon in the ash. The coal-feed hopper runs along the entire coal-feed end of the furnace. A coal grate is used to control the rate at which coal is fed into the furnace by controlling the thickness of the fuel bed. Coal must be uniform in size as large lumps will not burn out completely by the time they reach the end of the grate
Spreader Stoker Boiler
Spreader stokers utilize a combination of suspension burning and grate burning. The coal is continually fed into the furnace above a burning bed of coal. The coal fines are burned in suspension; the larger particles fall to the grate, where they are burned in a thin, fast-burning coal bed. This method of firing provides good flexibility to meet load fluctuations, since ignition is almost instantaneous when firing rate is increased. Hence, the spreader stoker is favoured over other types of stokers in many industrial applications.
Q (Q).Write short notes on ‘intermittent blow down’ and ‘continuous blow down’ with respect to boilers.
The ‘intermittent blown down’ is given by manually operating a valve fitted to discharge pipe at the lowest point of boiler shell to reduce parameters (TDS or conductivity, pH, Silica and Phosphates concentration) within prescribed limits so that steam quality is not likely to be affected. In intermittent blowdown, a large diameter line is opened for a short period of time, the time being based on a thumb rule such as “once a shift for 2 minutes”. ‘Intermittent blow down’ requires large short-term increases in the amount of feed water put into the boiler, and hence may necessitate larger feed water pumps than if continuous blow down is used. Also, TDS level will be varying, thereby causing fluctuations of the water level in the boiler due to changes in steam bubble size and distribution which accompany changes in concentration of solids. Also substantial amount of heat energy is lost with intermittent blow down.
‘Continuous Blowdown’:
There is a steady and constant dispatch of small stream of concentrated boiler water, and replacement by steady and constant inflow of feed water. This ensures constant TDS and steam purity at given steam load. Once blow down valve is set for a given conditions, there is no need for regular operator intervention. Even though large quantities of heat are wasted, opportunity exits for recovering this heat by blowing into a flash tank and generating flash steam. This flash steam can be used for pre-heating boiler feed water or for any other purpose. This type of blow down is common in high-pressure boilers.
Q (R).Explain the reasons for carrying out “blow down” in a boiler?
Water contains certain percentage of dissolved solids. The percentage of impurities found in boiler water depends on the untreated feed water quality, the treatment process used and the boiler operating procedures. As a general rule, the higher the boiler operating pressure, the greater will be the sensitivity to impurities. As the feed water materials evaporate into steam, dissolved solids concentrate in the boiler either in a dissolved or suspended state. Above a certain level of concentration, these solids encourage foaming and cause carryover of water into the steam. This leads to scale formation inside the boiler, resulting in localized overheating and ending finally in tube failure.It is therefore necessary to control the level of concentration of the solids and this is achieved by the process of ‘blowing down’, where a certain volume of water is blown off and is automatically replaced by feed water – thus maintaining the optimum level of total dissolved solids (TDS) in the water. Blow down is necessary to protect the surfaces of the heat exchanger in the boiler.
IF YOU LIKE THIS POST “BOILER INTERVIEW QUESTION & ANSWER” PLEASE LIKE , SHARE AND YOU COMMENTS IS VERY VALUABLE SO PLEASE GIVE YOUR SUGGESTIONS IN COMMENT BOX please read once time if any mistake you find in this artical please suggest me through comment box or if this website contains all original article which are written by me if any article on this site find copyrighted please inform me through at joginder005@gmail.com……..THANK’S
Heii all power engineers myself joginder chauhan . i am the founder of my website www.askpowerplant.com. i am also a power engineer and having the more than 5 year experience in the field of power sectors during this time period i learn about different power technology like AFBC , CFBC , TRAVELLING GRATE , PULSATING GREAT , PF BOILER , WHRS and many more things . my motive from this site sharing my power sector knowledge each and everyone who belonging to this field , in this website i share information related to boiler operation , boiler maintenance , turbine operation & maintenance , boiler & turbine question answer , D.M plant , and all topic related to power plant sector please join this website for latest updation regarding power plant ………..thanks ( JOGINDER CHAUHAN )