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. Enthalpy of dry saturated steam remains same d.

  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 for

  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 chimney