Power Plant Guruji

  Central Boiler Operation Engineer (BOE) Exam Question Set - 25 1. Which of the following type of fuel does not contain ash? a) coal b) fuel oil c) natural gas d) synthetic fuels Ans.c 2. A coal containing high percentage of durian is called _________ a) splint b) bright c) boghead d) non-banded Ans. a 3. The gas which contributes maximum to heating value of natural gas is? a) CO b) CO2 c) H2 d) CH4 Ans. d 4. Low temperature carbonisation _________ a) produces less quantity of tar than high temperature carbonisation b) is mainly producing smokeless domestic coke c) is meant for production of ‘metallurgical coke’ d) produces higher temperature gas than high temperature carbonisation Ans. b 5. Which of the following is not considered a type of coal according to ASTM? a) anthracite b) bituminous c) peat d) lignite Ans. c 6. Which of the following is not directly determined in the Proximate Analysis of coal? a) Volatile Matter b) Fixed Carbon c) Moisture d) Ash Ans. b 7. Which of these is

  Boiler Operation Engineer Exam Previous Year solved MCQ Set - 24 1. In pure oxygen, the maximum flame temperature is _____________ a) higher than the theoretical flame temperature b) lower than the theoretical flame temperature c) equal to the theoretical flame temperature d) none of the mentioned Ans. a 2. The heat transferred when the H2O in the products is in the liquid state is called? a) HCV b) LCV c) LHV d) None of the mentioned Ans. a 3. The maximum temperature achieved for given reactants is called? a) Practical Flame Temperature b) Critical Temperature c) Theoretical Flame Temperature d) None of the mentioned Ans. c 4. The heat transferred when the H2O in the products is in the vapour state is called? a) HCV b) LCV c) HHV d) None of the mentioned Ans. b 5. Maximum Theoretical Flame Temperature corresponds to _____________ a) Partial Combustion b) Incomplete Combustion c) Complete combustion d) None of the mentioned Ans. c 6. The maximum turbine flame temperature can be can b

Boiler Operation Engineer Previous year Questions With Answer Set - 23 1. Bomb calorimeter is used determine the calorific value of ___________ a) solid fuels b) liquid fuels c) both solid and liquid fuels d) none of the mentioned Ans. c 2. Which of these is not a reason for reduction in maximum flame temperature in actuality? a) incomplete combustion b) heat loss to exhaust gases c) excess air requirements d) heat loss to surroundings Ans. b 3. Higher efficiency in combustion of solid fuel cannot be achieved by ___________ a) keeping flue gas temperature very high b) proper fuel preparation c) supplying correct quantity of combustion air d) adopting efficient fuel-firing technique and equipment Ans. a 4. Internal energy of combustion products is ______________ than that of reactants. a) less b) more or less (depends on state of fuel) c) same d) more Ans. a 5. Grindability index of a coal is 100. It implies that the __________ a) coal can be easily pulverised b) coal can be pulverised

Boiler Operation Engineer Previous year Questions With Answer Set - 22 1. Stack heat losses can be minimised by __________ a) using low c.v. fuels b) controlling the excess air c) oxygen enrichment of combustion air d) maintaining proper draft in the furnace Ans. b 2. Natural draught produced by a chimney depends upon __________ a) density of chimney gases b) height of chimney c) both ‘density of chimney gases’ and ‘height of chimney’ d) none of the mentioned Ans. c 3. Which of the following types of the fans has the highest cost? a) centrifugal fans b) axial fans c) primary fans d) gas recirculation fans Ans. b 4. Which of these is not a type of drive of variable speed control? a) variable speed turbine b) hydraulic coupling c) multiple speed ac motor d) electronically adjustable turbine drive Ans. d 5. In a furnace employing forced draught compared to induced draught __________ a) the fan operates hot and hence blades are liable to corrosion and erosion b) positive pressure exists in

Boiler Operation Engineer (BOE) Previous Year Questions With Answer - 21 1. What is the solubility of dissolved gases at boiling or saturation temperature? a) Positive b) Negative c) Zero d) None of the mentioned Ans. c 2. In the deaerator, the feedwater is heated to the saturation temperature by the steam extracted from? a) compressor b) turbine c) pump d) none of the mentioned Ans. b 3. Which of the following type heater is known as deaerator? a) Contact-type open heater b) Contact-type closed heater c) Closed heater d) None of the mentioned Ans. a 4. Where is the deaerator placed in the feedwater system? a) in the beginning b) in the middle c) at the end d) there is no deaerator in the feedwater system Ans. b 5. Which among the following goes to the Vent Condenser along with Oxygen & Carbon dioxide? a) Sodium sulphite b) Carbon monoxide c) Water vapour d) None of the mentioned Ans. c 6. Why is the deaerator not employed in water cooled & moderated nuclear power plant? a) due

Boiler Operation Engineer Previous year Questions With Answer Set - 20 1.What is the purpose of Deaerator ? a) to remove the dissolved oxygen and carbon dioxide b) to remove the dissolved nitrogen c) to remove the dissolved impurities d) to supply more oxygen to feedwater Ans. a 2.How dissolved oxygen and carbon dioxides are removed ? a) by allowing it to fall from height b) by series of chemical reactions c) by condensing feedwater d) by heating feedwater to saturation temperature Ans. d 3.What chemicals are added for residual dissolved oxygen and carbon dioxide ? a) sodium sulphite b) hydrazine c) alum d) all of the mentioned Ans. d 4.What do you mean by vent condenser ? a) a condensing unit b) a temperature measuring instrument c) a heat exchanger d) dissolves oxygen Ans. c 5.Why deaerator is installed at a certain height from the pump ? a) to provide a net positive suction head b) to maintain less pressure c) to avoid leakage d) to maintain pressure Ans. a 6.Why deaerator is not us

 1. Closed heaters are __________ a) horizontal b) vertical c) inclined d) depends on the requirement Ans. d 2. What do you mean by heater drip ? a) condensate b) heater failure c) extract d) maximum temperature Ans. a 3. What are the advantages of open heater? a) lower cost b) high heat transfer capacity c) high feedwater temperature d) all of the mentioned Ans. d 4. Why at least one open heater is used? a) installed vertically b) feedwater deaeration c) less cost d) increase efficiency 5. The value of TTD varies with __________ a) heater pressure b) heater temperature c) turbine inlet temperature d) independent of all mentioned Ans. a 6. Expand TTD ? a) turbine temperature difference b) total temperature difference c) terminal temperature difference d) turbine terminal difference Ans. c 7. Closed heaters are also called __________ a) contact type heater b) shell and heat exchanger c) drip heaters d) shell and tube heater Ans. b 8. In open feedwater heater __________ a) the extracted

  1. What is the unit of Heat rate ? a) kJ/KW b) KW/kJ c) kJ d) KW Ans. a 2. Rankine efficiency of a Steam Power Plant ___________ a) improves in Summer as compared to that in Winter b) improves in Winter as compared to that in Summer c) is unaffected by climatic conditions d) none of the mentioned Ans. b 3. Rankine cycle comprises of ___________ a) two isentropic processes and two constant volume processes b) two isentropic processes and two constant pressure processes c) two isothermal processes and two constant pressure processes d) none of the ment Ans. b 4. Rankine cycle operating on low pressure limit of p1 and high pressure limit of p2 ___________ a) has higher thermal efficiency than the Carnot cycle operating between same pressure limits b) has lower thermal efficiency than Carnot cycle operating between same pressure limits c) has same thermal efficiency as Carnot cycle operating between same pressure limits d) may be more or less depending upon the magnitudes of p1 and p2 An