Power Plant Guruji

  Boiler Operation Engineer Previous year Questions With Answer Set - 29 1.Main objective of a boiler trial is?  a. To determine the generating capacity of the boiler b. To determine the thermal efficiency of the boiler, when working at a definite pressure c. To prepare heat balance sheet for the boiler d. All of the above Ans. d 2.Device used to put off fire in the furnace of the boiler, when the level of water in the boiler falls to an unsafe limit, is ? a. Safety valve b. Fusible plug c. Blow off cock d. Stop valve Ans. b 3.The shell of the Cochran boiler is made hemispherical?  a. To provide maximum strength and  b.To withstand high pressure inside space c. Both (a) and (b)  d. None of these  Ans. c 4.The dryness fraction of steam within a turbine is not allowed to fall below a. 0.5  b. 0.95 c. 0. 99 d. 0.9 Ans. d 5. With increase in pressure  a. Enthalpy of dry saturated steam increases b. Enthalpy of dry saturated steam decrease  c. Ent...

  Boiler Operation Engineer Previous year Questions With Answer Set - 28 1. What is the critical pressure of steam in a utility steam generator? a) 220.2 bar b) 221.2 bar c) 222.2 bar d) 225.2 bar Ans. b 2. The boiler in which the tubes are surrounded by hot gases is called ___________ a) fire tube boiler b) water tube boiler c) both fire and water tube boiler d) none of the mentioned Ans. b 3. Which of these is not a type of steam generator depending upon the kind of applications? a) utility steam generators b) marine steam generators c) agricultural steam generators d) industrial steam generators Ans. c 5. Which of the following are drumless once-through steam generators? a) Subcritical steam generator b) Supercritical steam generators c) Utility steam generators d) Marine steam generators Ans. b 6. The supercritical steam generators operate at a pressure range of ___________ a) 200-240 bar b) 200-220 bar c) 220- 240 bar d) >240 bar Ans. d 7. Marine steam generators are ______...

  Boiler Operation Engineer Objectives Questions And Answers Set - 27 1. Comparing fire tube and water tube boilers, which boiler can produce comparatively higher pressure steam than another for the same capacity? a) fire tube boiler b) water tube boiler c) both can produce steam at same pressure for the same capacity d) none of the mentioned Ans. b 2. What is the purpose of using economizer in the boiler? a) to heat feed water by utilizing heat from exhaust gases b) to heat feed water by utilizing some heat from superheated steam c) to superheat steam d) none of the mentioned Ans. a 3. How is the natural draught produced for exhaust gases? a) by using fan b) by using chimney c) by using gravity d) none of the mentioned Ans. b 4. What is the purpose of super heater in a boiler? a) to increase the temperature of saturated steam with increase in its pressure b) to increase the temperature of saturated steam without increase in its pressure c) to increase the temperature of feedwater ...

  Boiler Operation Engineer Previous year Questions With Answer Set - 26 1. What is the critical pressure of steam? a) 221.2 bar b) 220 bar c) 120 bar d) 300 bar Ans. a 2. An air preheater is installed _____________ a) between the economiser and chimney b) before the superheater c) before the economiser d) none of the mentioned Ans. a 3. The natural draught is produced by _________ a) steam jet b) chimney c) centrifugal fan d) none of the mentioned Ans. b 4. Which of the following boiler is best suited to meet the fluctuating demand of steam? a) Locomotive boiler b) Lancashire boiler c) Babcock and Wilcox boiler d) Cornish boiler Ans. a 5. Which of the following statement is wrong? a) Water tube boilers are internally fired b) Locomotive boiler is a water tube boiler c) La-mont boiler is a low pressure water tube boiler d) All of the mentioned Ans. d 6. The object of producing draught in a boiler is _________ a) to discharge the gases of combustion to the atmosphere through the chi...

  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 thes...

  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 c...

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...