MAHARASHTRA BOE EXAM PAPER – 2012 Question & Answers
MAHARASHTRA BOE EXAM PAPER – 2012 Question & Answers
Heidi, all my Askpowerplant.com users, today we discussed a critical topic that is related to the BOE examination. This topic is essential for those who want to prepare for the boe examination and those preparing for the interview for Boiler first-class or power plant shift in charge and boe viva vice preparation. So please read this article until the end. If you liked this article, please share. This article discussed MAHARASHTRA BOE EXAM PAPER – 2012 Question & Answers paper-1. This exam board asks 10 questions, which is one mark. If the candidate answers all these questions correctly, he is awarded 10 out of 10, so if we look into getting good marks in the BOE exam, then the importance of these answers increases. So let’s discuss MAHARASHTRA BOE EXAM PAPER – 2012 Question & Answers paper-1
Q 1. The deaerator is placed at a higher elevation
a.) For good housekeeping
b.) To keep the building cool
c.) To increase NPSH and avoid cavitation in boiler feed pump
d.) To vent steam easily
Hint: Deaerators in steam turbine plants/Power Plants are permanently installed at heights for two main reasons, which we discussed here. One is to increase NPSH (Net positive suction head ), and the second is to avoid cavitation in the boiler feed pump. When the boiler feed pump is in operation, low pressure is created at the suction end of the pump; there is a chance of steaming feed water, as water is at a higher temperature. This is called cavitation. This situation may arise whenever pressure at the suction side of the boiler feed pump drops below saturated pressure. To avoid this situation, the Deaerator is placed at a higher level. If the Deaerator pressure is 2kg/cm2 and the Deaerator is positioned at an elevation of 20 meters, then the pump suction pressure will be approximately 5 kg/cm2.
Q 2. Stoichiometric combustible mixture speaks about
a.) Fuel calorific value
b.) Temperature of air and fuel
c.) Unburnt carbon in flue gas
d.)Theoretical air
Hint: The Stoichiometric ratio is the calculated ratio between air and flammable gas or vapor at which complete combustion takes place. The stoichiometric ratio of combustion varies for different fuels and oxidizers. A Stoichiometric ratio is neither rich( more ) nor lean (less ). It contains just enough oxygen to burn all the fuel.
The theoretical air is the minimum amount of air-fuel ratio in which complete combustion of the fuel takes place, which is called theoretical air.
Q 3. As per Indian Boiler, rule section-392, major repairs such as fusion weld must be entrusted to a repairer
a.) Who can satisfy the owner regarding the quality of welding
b.) Who can fulfill the boiler director regarding the quality of welding
c.) Who can satisfy the manager regarding the quality of welding
d.) Who has a qualified welder with him
Hint: As per Indian Boiler, rule section-392, major repairs such as fusion weld are to be entrusted to a repairer who can satisfy the owner regarding the quality of welding.
According to Boiler Act Reg. 392, the following considerations made
Repairs to boilers and steam pipes :
In Major repairs of boilers such as fusion welded or riveted patches to shells, fireboxes, and end plates of boilers and extensive building up of wasted parts of boilers permitted under these regulations, the renewal of furnaces and end plates, parts of the shell, fireboxes, girders, and steam-pipes, etc. shall only be entrusted to a firm who is recognized as a repairer under these regulations.
Q 4. Pressure drop across which type valve is more
a.) Gate valve
b.) Butterfly valve
c.) Globe valve
d.) Plug valve
Hint: Pressure drops across the globe valve as compared to the gate valve because a globe valve changes the direction of flow, and the seat opening is almost always smaller than the pipe diameter, so it presents measurable friction loss.
Q 5. The safety valve is installed at the low-pressure side of the reducing station to
a.) Releases overpressure due to failure of control valve
b.) Releases steam to maintain pressure
c.) opens during high-temperature
d.) Open during high moisture
Hint: A safety valve is installed at the pressure side of the reducing station to Release pressure due to failure of the control valve. Safety valves are the central part of the steam PRV ( Pressure pressure-reducing valve) station. But they may not be required in every case. Whenever the steam component or the steam line downstream of the steam PRV( Pressure pressure-reducing valve) is not rated for the maximum inlet steam pressure to the PRV station, then a safety valve must be installed to protect the system.
For the maximum steam flow, the safety valve needs to be sized concerning the highest steam pressure that could be provided to the PRV. In addition, rectifying the proper safety valve size should be performed based on calculations with the most considerable Cv trim available for the PRV. During the installation of a safety valve, we should ensure the discharge is piped to a location where it will not generate any safety risk for the plant or personnel.
Q 6. Bed slumping is done in the AFBC boiler to
a.) Reduced pressure
b.) Reduced temperature
c.) Reduced Load
d.) Maintained Bed Temperature
Hint: The total bed of the FBC boiler is divided into compartments. Each compartment has an independent coal feeding system with its air box and air nozzles for fluidization. Depending upon the load on the boiler on the boiler some compartments are taken out of service. This procedure is called compartment slumping and bed slumping. So, bed slumping is done on the AFBC boiler to reduce load. So, bed slumping is done on the AFBC boiler to reduce load.
Q 7. Mobrey switch is used to
a.) Control drum level
b.) control fuel flow
c.) Control air flow
d.) Maintained fan speed
Hint: According to its name, Mobrey is used for the Automatic water level controller or automatic water maintenance; it comes under the category of mountings and fittings of Steam Boiler Assembly. Mobrey is used to maintain the water level in the boiler shell. It is mainly used in smoke tube steam boilers, not water tube boilers, so the Mobrey switch controls the drum level.
Q 8 . Scoop tube control is used in the feed pump to
a.) Control vibration
b.) Current Measurement
c.) control Ph of feed water
d.) control drum level
Hint: Generally, the boiler feed pump motor is permanently ruined at a constant speed during star-delta mode, but with the help of the scoop tube system, the RPM of the pump varies. Input to the scoop tube system is the differential pressure (DP) across the boiler feed water regulating system control valve ( In turn, drum level, 3 or 1 element). The controller will maintain the feed water station control valve position so that the scoop tube control is used in the feed pump to control the drum level .
Q 9. For easy storage of bagasse
a.) Bagasse is air dried
b.) Balling is done
c.) Bagasse is washed
d.) Water is sprayed
Hint: when sugarcane crushing happens in the sugar industry, after cane crushing with the help of steaming, we remove all the juice from the sugar cane. After removing it, crushed cane goes through big rollers where the remaining moisture is removed. After that, when high moisture content remains, bagasse, typically 40–50 percent, is detrimental to its use as a fuel. In general, bagasse is stored before further use for another purpose. Electricity production is stored under moisture conditions, and the mild exothermic process resulting from residual sugar degradation dries the bagasse pile slightly. For easy storage of bagasse, bagasse should be is air dried
Q10 . The oil burner is used in a pulverizing boiler to
a.) To reduce soot formation
b.) To reduce coal consumption
c.) Stabilize the flame during low load and provide ignition energy during start-up
d.) To increase reheat steam temperature
Hint: An oil burner is used in the pulverized boiler to Stabilize the flame during low load and provide ignition energy during start-up
IF YOU LIKE THIS POST ” MAHARASHTRA BOE EXAM PAPER – 2012 Question & Answers,” PLEASE LIKE, SHARE, AND YOU COMMENTS IS VERY VALUABLE SO PLEASE GIVE YOUR SUGGESTIONS IN THE COMMENT BOX, please read once time if any mistake you find in this article please suggest me throughthe comment box or if this website contains all original article which is written by me if any article on this site find copyrighted please inform me through at joginder005@gmail.com……..THANK’S
Hi, all power engineers. I am Joginder Chauhan(B.Tech(Mech.Engg.)BOE/E.M.) I am the founder of the website www.askpowerplant.com. I am also a power plant engineer with over 12+ years of experience in the power sector. I learned about power technologies like AFBC, CFBC, TRAVELLING GRATE, PULSATING GREAT, PF BOILER, WHRS, and many more during this period. My motive for this site is to share my power sector knowledge with every person who belongs to this field; on this website, I share information related to boiler operation, boiler maintenance, turbine operation & maintenance, boiler & turbine question answers, D.M plant, and all topic related to power plant sector please join this website for latest updation regarding power plant ………..thanks ( JOGINDER CHAUHAN )
No Comments