Chapter 2: Process Engineering
2.1 Process Boilers
1 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
2 Essentially an isentropic process is___________
- (A) Non-heat transfer process
- (B) Reversible process
- (C) Constant temperature process
3 Presence of moisture in fuel oil would
- (A) Keep the burner tips cool
- (B) Aid in proper combustion
- (C) Because sputtering, possibly extinguishing flame
- (D) Clean the nozzles
4 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
5 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
6 The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be
- (A) 0.4
- (B) 0.56
- (C) 0.67
- (D) 1.67
7 A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion.
- (A) 60°
- (B) 90°
- (C) 180°
- (D) 270°
8 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
9 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
10 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
11 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
12 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
13 Foaming is caused by the formation of ___________
- (A) Acids
- (B) Alcohols
- (C) Oils and alkalis
- (D) Ketones
14 Boiler is an enclosed vessel that provides
- (A) Expansion
- (B) Ignition
- (C) Combustion
- (D) None of the above
15 High pressure boilers operate at
- (A) Lower than 15 psig
- (B) Higher than 15 psig
- (C) 15 psig
- (D) None of above
16 Boiler works from application of which type of energies
- (A) Fuel combustion
- (B) Electricity
- (C) Nuclear energy
- (D) All of above
17 Combustion of which fuels from following is source of heat for boiler
- (A) Wood
- (B) Coal
- (C) Oil
- (D) All of above
18 Boilers are used in places like
- (A) Domestic heating
- (B) Commercial heating
- (C) Industrial heating application
- (D) All of above
19 Type of Lamont boiler is_______
- (A) Forced circulation
- (B) Natural circulation
- (C) Over-through
- (D) Positive forced circulation
20 What is called as the heart of the Lamont boiler?
- (A) Water drum
- (B) Centrifugal pump
- (C) Furnace
- (D) Blower
21 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
22 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
23 Through which does the even circulation of water is possible in Lamont boiler?
- (A) Nozzles
- (B) Water trough
- (C) Feed pump
- (D) Hose
24 What is the pressure range between which Lamont boiler operators?
- (A) 80-120 bar
- (B) 120-160 bar
- (C) 180-360 bar
- (D) 450-560 bar
25 In which year was Lamont boiler invented?
- (A) 1905
- (B) 1910
- (C) 1920
- (D) 1925
26 What type of steam is generated by evaporator tube of Lamont boiler?
- (A) Saturated steam
- (B) Unsaturated steam
- (C) Superheated steam
- (D) Flash steam
27 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
28 What is the main disadvantage of Lamont boiler?
- (A) Less flexible in design
- (B) Low heat transfer rate
- (C) Formation of bubbles
29 What happens when air dissolves in condensate?
- (A) Non corrosive
- (B) Temperature of air increases
- (C) corrosive
- (D) None of above