# Emerging Trends in Mechanical Engineering

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## 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

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