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
[showhide type=”button7c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
2   Essentially an isentropic process is___________
    (A)   Non-heat transfer process
    (B)   Reversible process
    (C)   Constant temperature process
[showhide type=”button7c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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°
[showhide type=”button7c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
13   Foaming is caused by the formation of ___________
    (A)   Acids
    (B)   Alcohols
    (C)   Oils and alkalis
    (D)   Ketones
[showhide type=”button7c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
14   Boiler is an enclosed vessel that provides
    (A)   Expansion
    (B)   Ignition
    (C)   Combustion
    (D)   None of the above
[showhide type=”button7c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
15   High pressure boilers operate at
    (A)   Lower than 15 psig
    (B)   Higher than 15 psig
    (C)   15 psig
    (D)   None of above
[showhide type=”button7c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
16   Boiler works from application of which type of energies
    (A)   Fuel combustion
    (B)   Electricity
    (C)   Nuclear energy
    (D)   All of above
[showhide type=”button7c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
17   Combustion of which fuels from following is source of heat for boiler
    (A)   Wood
    (B)   Coal
    (C)   Oil
    (D)   All of above
[showhide type=”button7c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
18   Boilers are used in places like
    (A)   Domestic heating
    (B)   Commercial heating
    (C)   Industrial heating application
    (D)   All of above
[showhide type=”button7c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
19   Type of Lamont boiler is_______
    (A)   Forced circulation
    (B)   Natural circulation
    (C)   Over-through
    (D)   Positive forced circulation
[showhide type=”button7c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
20   What is called as the heart of the Lamont boiler?
    (A)   Water drum
    (B)   Centrifugal pump
    (C)   Furnace
    (D)   Blower
[showhide type=”button7c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
23   Through which does the even circulation of water is possible in Lamont boiler?
    (A)   Nozzles
    (B)   Water trough
    (C)   Feed pump
    (D)   Hose
[showhide type=”button7c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
25   In which year was Lamont boiler invented?
    (A)   1905
    (B)   1910
    (C)   1920
    (D)   1925
[showhide type=”button7c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
28   What is the main disadvantage of Lamont boiler?
    (A)   Less flexible in design
    (B)   Low heat transfer rate
    (C)   Formation of bubbles
[showhide type=”button7c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: –C [/showhide]
29   What happens when air dissolves in condensate?
    (A)   Non corrosive
    (B)   Temperature of air increases
    (C)   corrosive
    (D)   None of above
[showhide type=”button7c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]

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