Unit:- 3 Performance of Boilers
1. Which of the following boiler is best suited to meet the fluctuating demand of steam.......
A.Locomotive boiler
B.Lancashire boiler
C.Cornish boiler
D.Babcock and wilcox boiler
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A.Locomotive boiler
2. Which of the folling is a water tube boiler........
A.Locomotive boiler
B.Lancashire boiler
C.Cornish boiler
D.Babcock and wilcox boiler
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3. The economiser is used in boilers to........
A.Increase thermal efficiency of boiler
B.Economise on fule
C.Extract heat from the exhaust the gases
D.Increase flue gas temperature
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4. An economiser in a boiler........
A.Increases steam pressure
B.Increases steam flow
C.Decreases fuel consumption
D.Decreases steam pressure
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5. Size of boiler tubes is specified by
A.Mean diameter and thickness
A.Inside diameter and thickness
C.Outside diameter and thickness
D.Outside diameter and inside diameter
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6. The water tubes in a simple vertical boiler are
A.Horizontal
B.Vertical
C.Inclined
D.All of the above
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C.Inclined
7. The diameter of fire tubes in cochran boiler is of the order of........
A.2 cm
B.6 cm
C.8 cm
D.15 cm
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8. Lancashire boiler is a........
A.Stationary fire tube boiler
B.Internally fire tube boiler
C.Horizontal boiler
D.All of the above
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9. The diameter of internal flue tubes of a Lancashire boiler is about........that of it's shell
A.One-fourth
B.One-third
C.Two-fifth
D.One-half
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10. Thermal efficiency of well maintained boiler will be of the order......
A.30%
A.55%
C.90%
D.45%
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11. In locomotive boiler,maximum steam pressure is limited to.....
A.1 kg/cm2
B.5 kg/cm2
C.10 kg/cm2
D.18 kg/cm2
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D.18 kg/cm2
12. The difference between cornish boiler and lancashire boiler is ........
A.Former is fire tube type and latter is water tube type boiler
B.Former is water tube type and latter is fire tube type boiler
C.Former contain one fire tube type and latter contains two water tube type boiler
D.None of the above
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13. The water tubes in a babcock and wilcox boiler are........
A.Horizontal
B.Vertical
C.Inclined
D.Horizontal and inclined
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14. Locomotive boiler is a following type........
A.Multitubutar
B.Horizontal
C.Internally fired
D.All of the above
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15. The shell diameter and length of locomotive boiler are......
A.1.5 m,4 m
A.1.5 m,6 m
C.1 m,4 m
D.2 m,4 m
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16. Which of the following is a water tube boiler.....
A.Locomotive boiler
B.Cornish boiler
C.Cochran boiler
D.Babcock and Wilcox boiler
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D.Babcock and Wilcox boiler
17. Which of the following is a fire tube boiler........
A.Locomotive boiler
B.Cornish boiler
C.Cochran boiler
D.Babcock and Wilcox boiler
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18. The number of fire tubes in lancashire boiler is........
A.Zero
B.One
C.Two
D.Four
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19. Lancashire boiler is of........
A.Stationary fire tube-type
B.Horizontal type
C.Natural circulation type
D.All of the above
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20. Locomotive type boiler is a......
A.Horizontal multitubular water tube boiler
A.Water wall enclosed furnace type
C.Vertical tubular fire tube type
D.Horizontal multitubular fire tube boiler
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21. Water tube boilers are those in which.....
A.Flue gases pass through tubes and water around it
B.Water passes through the tubes and flue gases around it
C.Work is done during adiabatic expansion
D.Change is enthalpy
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B.Water passes through the tubes and flue gases around it
22. Fire tube boilers are those in which.............
A.Flue gases pass through tubes and water around it
B.Water passes through the tubes and flue gases around it
C.Work is done during adiabatic expansion
D.Change is enthalpy
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23. The diameter of fire tube of cornish boiler compared to its shell is........
A.One-half
B.One-thired
C.Two-fifth
D.Three-fifth
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24. The length of cornish boiler is of the order of........
A.2-4 m
B.3-5 m
C.5-7.5 m
D.7-9 m
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25. Cochran boiler is a......
A.Horizontal fire tube boiler
A.Horizontal water tube boiler
C.Vertical water tube type
D.Vertical fire tube type
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26. Locomotive boiler has.....
A.137 fire tubes and 44 superheated tubes
B.147 fire tubes and 34 superheated tubes
C.157 fire tubes and 24 superheated tubes
D.167 fire tubes and 14 superheated tubes
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C.157 fire tubes and 24 superheated tubes
27. 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
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28. La-mont boiler,is a........pressure water tube steam boiler working on forced circulation
A.Low
B.High
C.Equal
D.All of the above
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29. Which of the following is best suited to meet fluctuating deamand of steam........
A.Locomotive boiler
B.Lancashire boiler
C.Cornish boiler
D.Babcock boiler and wilcox boiler
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30. Cochran boiler is a......
A.Horizontal fire tube boiler
A.Horizontal water tube boiler
C.Vertical water tube type
D.Vertical fire tube type
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31. Then biggest loss in the boiler is.....
A.Moisture in fuel
B.Dry in flue gases
C.Steam formation
D.Unburnt carbon
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B.Dry flue gases
32. The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called......
A.Steam efficiency
B.Boiler efficiency
C.Evaporation capacity of a boiler
D.None of the above
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33. The draught in locomotive boilers is produced by a ........
A.Chimney
B.Centrifugal fan
C.Steam jet
D.All of the above
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34. The draught may be produced by a ........
A.Chimney
B.Mechanical fan
C.Steam jet
D.All of the above
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35. The mechanical draught produces......draught than natural draught
A.More
B.Less
C.Equal
D.None of the above
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36. The efficiency of the plant.....with the mechanical draught
A.Increases
B.Decreases
C.Remain constant
D.None of the above
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A.Increases
37. The mechanical draught......the amount of smoke
A.Increases
B.Decreases
C.Does not effect
D.Remain same
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38. The chimney draught varies with........
A.Climatic condition
B.Temperature of furnace gases
C.Height of chimney
D.All of the above
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39. The draught produced by a steam jet issuing from a nozzle placed in the chimney,is called........
A.Induced steam jet draught
B.Forced steam jet draught
C.Chimney draught
D.None of the above
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40. The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called ......
A.Natural draught
A.Induced draught
C.Forced draught
D.Balanced draught
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