Power Plant Guruji

  1. Which of these factors don’t cause Internal Irreversibility of a Rankine cycle? a) Throttling b) Mixing c) Fluid Friction d) Fluid flow Ans. d 2. Phase change at constant pressure takes place in _____________ a) Economiser b) Evaporator c) Superheater d) Air-Preheater Ans. b 3. If Evaporator & Condenser pressures are p & q, the intercooler pressure P is given as? a) P = pq b) P = p/q c) P = (pq)(1/2) d) P = p2q Ans. c 4. For analytical purposes, the Rankine Cycle is assumed to be in _____________ a) Unsteady flow operation b) Turbulent flow operation c) Steady flow operation d) Laminar flow operation Ans. c 5. The net work done in a Rankine Cycle is the difference of _____________ a) Condenser work & Boiler work b) Boiler work & Pump work c) Turbine Work & Pump work d) Condenser work & Pump work Ans. c 6. In Rankine Cycle, water is converted to saturated liquid in ___________ a) Evaporator b) Economizer c) Superheater d) Preheater Ans. b 7. Which is the mos

  1. Which of these is a ‘fissile fuel’? a) Thorium b) Carbon c) Potassium d) Graphite Ans. a 2. Which of these is a ‘working fluid’ in liquid phase? a) Water b) Steam c) Mercury d) Oxygen Ans. a 3. Which of these is an output of a ‘Furnace’? a) Fuel gas b) Air c) Flue gases d) Water Vapour Ans. c 4. What kind of energy output is obtained from a ‘Steam Power Plant’? a) Heat energy b) Sound energy c) Electricity d) Thermal energy Ans. c 5. What are the components of a Steam Power Plant? a) Evaporator, Condenser, Boiler, Expansion valve b) Evaporator, Condenser, Boiler, Turbine c) Boiler, Turbine, Condenser, Pump d) Boiler, Turbine, Pump, Expansion valve Ans. c 6. The product of efficiency & heat transferred to the working fluid is? a) Net temperature change b) Net work done c) Net enthalpy change d) None of the mentioned Ans. b 7. What kind of a process does a ‘Steam Power Plant’ undergoes? a) Adiabatic b) Cyclic c) Irreversible d) Expansion Ans. b 8. The net change in internal ener

 Boiler Operation Engineer Interview Question - 33 Q. What is Thermal Grinding ? Ans.  Grinding of Lignite by means of using flue gas at high temperature from furnace as result lignite is powdered in to fine particles and moisture content in the lignite is reduced. Flue gas is sucked by means of mill which acts like a fan. Thermal Grinding is carried out in Re suction Duct  of Mill. 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 of steam drum is set at higher pressure ? Why economiser is kept

  Boiler Operation Engineer Interview Question - 32 Q.What are the various chemical treatments in Boiler ? Ans.  Trisodium Phosphate - HP dosing done in the boiler drum.  Hydrazine – LP Dosing – Done at outlet of Deaerator / Suction of BFP - To remove dissolved oxygen in feed water to avoid corrosion. Read More Boiler 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 of steam drum is set at higher pressure ? Why economiser is kept at the top of the boiler ? How do you identify the leakage of economiser tube 

  Boiler Operation Engineer ( BOE ) Interview Question - 31 Q.What is RAPH & SCAPH and their functions ? Ans.  Regenerative Air Preheater ( RAPH ) : Regenerative air pre heater (RAPH) is mainly used for preheating the FD fan outlet air by utilising the outgoing flue gas temperature for making the combustion a rapid and efficient one. Steam Coil Air Preheater : Steam coil air pre heater (SCAPH) is employed mainly during start up. As during start up, the flue gas temperature at the inlet of RAPH will be less. If the air extracts more heat from the flue gas, the flue gas temperature falls below 140°C and it leads to cold end corrosion. So to avoid this air is preheated by SCAPH to that steam supplied from the AST header. So that heat transfer rate in RAPH can be reduced without allowing flue gas temperature to fall below 140C. The SCAPH is located after FD fan outlet and before RAPH.  Read More Boiler Interview Questions   What are the factors which affect the Natural circulation ? Wh

 Boiler Operation Engineer Interview Question - 30 Q. What is Forced circulation ? Ans.  The water is pumped through water wall circuit using circulating pump is placed near the bottom header and its suction from downcomer. Water is pumped under pressure through tubes ensuring positive circulation. Read More Boiler 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 of steam drum is set at higher pressure ? Why economiser is kept at the top of the boiler ? How do you identify the leakage of economiser tube  Can

 Boiler Operation Engineer Interview Question - 29 Q. Why once through boilers are having circulation ratio of only one ? Ans.  Once through boilers operate at a pressure above critical point at that pressure water flashed in to steam directly without actually boiling. In such cases water need not be circulated more than once for Converting the water in to steam. Read More Boiler 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 of steam drum is set at higher pressure ? Why economiser is kept at the top of th

 Boiler Operation Engineer Previous year Questions With Answer  Question 1. Fish mouth opening is a term used to describe ?  A. PA fan impeller crack B. Mill gear box crack C. Boiler tube failure D. FD fan blade crack Ans. C Question 2. Hydrastep is mounted on ?  A. Boiler drum B. Economiser C. Reheater D. Superheater Ans. A Question 3. Flame intensity in a boiler is sensed by ?  A. Ignitor B. Scanner C. Cameras D. All the above Ans. B Question 4. Balanced draft boilers have ?  A. Only FD fan B. Only ID fan C. Both FD fan and ID fan D. None of the above Ans. C Question 5. For regulating the steam flow in power plant which of the following is used A. Globe valve B. Gate valve C. Check valve D. Any of the above Ans. A Question 6. In a water wall of modern utility boiler, the water flows from A. Top to bottom B. Bottom to top C. Horizontally D. Any of the above Ans. B Question 7. In a jet condenser ?  A. There is mixing of steam and cooling water B. There is no mixing of steam and cooling

 Boiler Operation Engineer Interview Question - 28 Q.How do you calculate the Turbine Efficiency ? Ans. Turbine efficiency is the ratio of heat out put to the heat input Here, heat input is heat content in inlet steam and out put is power generation. Actually, total power generation = Power generated on generator terminal/ (Gear box efficiency X Alternator efficiency). What is Turbine heat rate ? Turbine heat rate is the ratio of total heat required to generate unit power. Turbine efficiency = 860 X 100/ Turbine heat rate Thermal power plant turbine heat rate = Steam flow (Main steam enthalpy - Feed water enthalpy) / Power generation.  Co - generation Turbine heat rate   = (Steam Flow x Steam Enthalpy +Makeup Water flow x Its Enthalpy+ RC Flow x RC Enthalpy)-(Process -1 steam flow x its Enthalpy+ Process -2 steam flow x Its Enthalpy+ FW Flow x FW Enthalpy)) /Power Generation.  Read More Boiler Interview Questions   What are the factors which affect the Natural circulation ? What is th

 Boiler Operation Engineer Interview Question - 27 Q. What is the effIciency of  power plant ? Ans .  Efficiency of the power plant is calculated based on heat input and out put. Power plant efficiency = Heat out put X 100/Heat In put.  In power plant, generally heat input is fuel, make up water and condensate return water from process. Heat out put is power generation. The formula for efficiency calculation is different for different plants. Efficiency of the power plant is given as.  Efficiency = 860 X 100/ Heat rate 1. For thermal power plants efficiency is calculated as; Efficiency = 860 X Power generation / Heat input.  Efficiency = 860 X PG X 100/ (Fuel consumption X Fuel GCV).  2. For co generation plants heat rate is calculated as; Efficiency = 860 X Power generation X 100/ (Fuel consumption X GCV + Make up water X Make up water enthalpy + Return condensate water X Enthalpy - Process steam flow X Enthalpy).  3. Co generation plant Efficiency is also calculated as; Efficiency =

  Boiler Operation Engineer Interview Question - 26 Q. Why does the boiler backfire ? Ans.  Back firing of boiler is due to: 1.Unbalanced draught 2.Reduced speed of ID fan or more speed of FD fan 3.Improper locking of fans damper (which may disturb in fan running due to air pressure) 4.Sudden trip of ID fan or closing of damper 5.High moisture fuel 6.More excess air 7.Jamming of APH Read More Boiler 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 of steam drum is set at higher pressure ? Why economiser is k