Description : When vapour is cooled at constant total system volume, the _______ changes. A] Volume. B] Pressure C] Temperature. D] None of the mentioned
Last Answer : B] Pressure
Description : When gas changes to liquid through the process of condensation, the temperature A] Increases. B] Decreases C] Remains constant. D] None of the mentioned
Last Answer : C] Remains constant.
Description : Direct relation between…….. &………of saturated steam, the amount of energy input to process easy to control. a) volume, pressure b) volume, temperature c) temperature, pressure d) None of above
Last Answer : c) temperature, pressure
Description : 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
Last Answer : b. Net work done
Description : When vapour is cooled at constant total system volume, the _______ changes. A Volume. B PRESSURE C Temperature. D None of the mentioned.
Last Answer : B PRESSURE
Description : Condensation starts ________ point. A] Dew point B] Bubble point C] Triple point D] None of the mentioned
Last Answer : A] Dew point
Description : Water vapor at 100 KPa and 150°C is compressed isothermally until half the vapor has condensed. How much work must be performed on the steam in this compression process per kilogram? a) -1384.7 kJ b) 1384.7 kJ c) -2384.7 kJ d) 2384.7 kJ
Last Answer : -1384.7 kJ
Description : Helium ( R= 0.4698 BTU/lbm-˚R ) is compressed isothermally from 14.7 psia and 68 ˚F. The compression ratio is 1:4. Calculate the work done by the gas. A. –1454 BTU/lbm B. -364 BTU/lbm C.-187BTU/lbm D.46.7 BTU/lbm Formula: W = RT ln (V2/V1)
Last Answer : -364 BTU/lbm
Description : The temperature and pressure in saturated stem has__________relationship a) Direct b) indirect c) Neither of above d) both a and b
Last Answer : b) indirect
Description : when steam is condensate volume is drastically……. a) reduces b) increase c) both a) & b) d) None of above
Last Answer : a) reduces
Description : What is the pressure range between which Lamont boiler operator ? a. 80-120 bar b. 120-160 bar c. 180-360 bar d. 450-560 bar
Last Answer : b. 120-160 bar
Description : High pressure boilers operate at 1. Lower than 15 psig 2. Higher than 15 psig 3. 15 psig 4. None of above
Last Answer : 2. Higher than 15 psig
Description : In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is (A) 0.007 bar (B) 0.053 bar (C) 0.06 bar (D) 0.067 bar
Last Answer : (D) 0.067 bar
Description : The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure. (A) Equal to (B) Less than (C) Higher than (D) None of these
Last Answer : (B) Less than
Description : In what is water in high pressure boiler circulated through? • Conduits • Cove • Channel • Tubes
Last Answer : • Tubes
Description : What increase as steam pressure increase inside a boiler • Force • Density • Rate of steam conversion • Viscosity
Last Answer : • Density
Description : What is the function of boiler? • To burn the fuel in a confined closed system With the supply of air • To generate steam in varying pressure • To generate steam at constant pressure • To produce flue gases by burning fuel at a given pressure
Last Answer : • To generate steam at constant pressure
Description : On mollier chart ,free expansion or throttling process from High pressure to atmosphere is represented by • Horizontal straight line • Vertical straight line • Straight inclined line • Curved line
Last Answer : • Horizontal straight line
Description : The back pressure created by lift is approximately ______PSIG for every 2 feet of condensate lift. a. 1 PSIG b. 3PSIG c. 1PSGI d. 3PSGI
Last Answer : a. 1 PSIG
Description : A -________ incorporates a firebox or furnace in order to burn the fuel and _________ heat. a. Boiler, generate b. Heat, boiler c. Steam, pressure d. None
Last Answer : a. Boiler, generate
Description : What is the main component in a boiler a) steam b) heat c) pressure condenser d) combination
Last Answer : a) steam
Description : An economiser in a boiler........ A]Increases steam pressure. B]Increases steam flow C]Decreases fuel consumption D]Decreases steam pressure
Last Answer : C]Decreases fuel consumption
Description : Water tube boilers produces steam at a________ pressure than that of fire tube boilers. a) Higher b) Lower c) Same d) None of the above
Last Answer : a) Higher
Description : Find false statement about effect of sulphur in fuel? (A) It has heating value (B) It helps in electrostatic precipitation of ash in flue gases (C) It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low (D) It erodes furnace walls
Last Answer : (D) It erodes furnace walls
Description : Adiabatic process is (A) Essentially an isentropic process is___________ (B) Non-heat transfer process (C) Reversible process (D) Constant temperature process
Last Answer : (B) Non-heat transfer process
Description : When the bubbles of steam are produced? • Once the water reaches saturation temperature • Once the water starts evaporating • Once the temperature decreases • None of the above
Last Answer : • Once the water reaches saturation temperature
Description : Feed water usually at…… °C temperature. a) 70 b) 120 c) 1000 d) 80
Last Answer : d) 80
Description : What is the temperature at which the steam boiler are capable to withstand • 200°C • 280°C • 540°C • 358°C
Last Answer : • 540°C
Description : What is the temperature at which the steam boiler are Capable to withstand a. 200°C b. 280°C c. 540°C d. 358°C
Last Answer : c. 540°C
Description : The economiser is used in boilers to........ A]Increase thermal efficiency of boiler B]Economise on fuel C]Extract heat from the exhaust the gases D]Increase flue gas temperature
Last Answer : A]Increase thermal efficiency of boiler
Description : What happens when air dissolves in condensate? a) non corrosive b) temperature of air increases c) corrosive d) none of above
Last Answer : c) corrosive
Description : What is the main disadvantage of Lamont boiler ? a. Less flexible in design b. Low heat transfer rate c. Formation of bubbles d. Low steam generation capacity
Last Answer : c. Formation of bubbles
Description : Where is water steam separator drum located in Lamont boiler ? a. Inside of the boiler b. Right above the furnace c. Before the feed water pump d. Outside the boiler
Last Answer : d. Outside the boiler
Description : What type of steam is generated by evaporator tube of Lamont boiler ? a. Saturated steam b. Unsaturated steam c. Superheated steam d. Flash steam
Last Answer : a. Saturated steam
Description : In which year was Lamont boiler invented? a. 1905 b. 1910 c. 1920 d. 1925
Last Answer : d. 1925
Description : Through which does the even circulation of water is possible in Lamont boiler ? a. Nozzles b. Water trough c. Feed pump d. Hose
Last Answer : a. Nozzles
Description : In what form are the boiler tube arrange in Lamont boiler ? a. Parallel in vertical b. Inclined vertically c. Parallel in horizontal d. Horizontally inclined
Last Answer : c. Parallel in horizontal
Description : Through what is feed water from hot-well is passed through, before entering steam and water drum in Lamont boiler? a. Evaporator tubes b. Economizer c. Distributor header d. Circulating pump
Last Answer : b. Economizer
Description : What is called as the heart of the Lamont boiler? a. Water drum b. Centrifugal pump c. Furnace d. Blower
Last Answer : b. Centrifugal pump
Description : Type of Lamont boiler is_______ a. Forced circulation b. Natural circulation c. Over-through d. Positive forced circulation
Last Answer : a. Forced circulation
Description : Boilers are used in places like 1. Domestic heating 2. Commercial heating 3. Industrial heating application 4. All of above
Last Answer : 4. All of above
Description : Combustion of which fuels from following is source of heat for boiler 1. Wood 2. Coal 3. Oil 4. All of above
Description : Boiler works from application of which type of energies 1. Fuel combustion 2. Electricity 3. Nuclear energy 4. All of above
Description : Boiler is a enclosed vessel that provides a) Expansion b) Ignition c) Combustion d) None of the above
Last Answer : c) Combustion
Description : Foaming is caused by the formation of ___________ a) Acids b) Alcohols c) Oils and alkalis d) Ketones
Last Answer : c) Oils and alkalis
Description : The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________ a) Foaming b) Priming c) Corrosion d) Caustic embrittlement
Last Answer : d) Caustic embrittlement
Description : The propulsion of water into steam drum by extremely rapid, almost explosive boiling of water at the heating surface is called ___________ a) Foaming b) Priming c) Corrosion d) Caustic embrittlement
Last Answer : b) Priming
Description : Which of the following option is incorrect about the sludges? a) Sludges are soft, loose and slimy precipitate b) They are non-adherent deposits and can be easily removed c) Formed generally at heated portions of the boiler d) Can be removed by blow down operation
Last Answer : c) Formed generally at heated portions of the boiler
Description : If the precipitate formed is soft, loose and slimy, these are __________ and if the precipitate is hard and adhering on the inner wall, it is called _____________ a) Sludges, scale b) Scale, sludges c) Sludges, rodent d) Scale, rodent
Last Answer : a) Sludges, scale
Description : Which of the following is not a result of the excess of impurity in boiler-feed. a) Scale and sludge formation b) Decomposition c) Corrosion, priming and foaming d) Caustic embrittlement
Last Answer : b) Decomposition