RAJASTHAN BOILER OPERATION ENGINEER EXAM-2018 (PAPER-1 & 2 ) WITH SOLUTION

Results

#1. The ratio of mass rate of water feeding to the steam-generating tubes to the mass flow rate of generated steam is defined as

Steam generation ratio

Circulation ratio

Turndown ratio

Evaporation ratio

Steam generation ratio: This is the ratio of the mass flow rate of steam generated to the mass flow rate of fuel burned.
Turndown ratio: This is the ratio of the minimum operating load to the maximum operating load.
Evaporation ratio: This is the ratio of the mass of water evaporated to the mass of fuel burned.

#2. In a working Boiler, maximum pressure exits in

Boiler Drum

Steam lines of Boiler

Feed lines of Boiler

Blow down line of Boiler

in question asked in a working boiler, Feed lines of boiler is not a part of boiler, but in this line pressure is maximum so,

pressure reducing in accordance

feed lines of boiler>blow down lines of boiler>boiler drum> steam lines of boiler

#3. What should be the silica percentage in superheated steam for efficient operation of steam turbines?

0.2 ppm

0.02 ppm

2 ppb

2 ppm

#4. How many kg of CO2 are produced in complete combustion of 16 kg of Methane?

None of the above

#5. Size of boiler tube is specified by

Mean dia and thickness

Inside dia and thickness

Outside dia an thickness

Outside dia alone

#6. The pH of feed water in which hydrazine dosing is practiced

Remains the same after & before dosing

Increase after hydrazine dosing

Decrease after hydrazine dosing

#7. Which is not desirable property of fuel

Economical in cost

Minimum sulphur content

High ignition point

High heat value

#8. Calculate the boiler efficiency (in percentage) of certain boiler if Evaporation ratio is 5. Enthalpy difference between saturated steam and feed water is 1500 kcal/kg. Given the Gross Calorific Value of fuel is 10,000 kcal/kg of fuel.

#9. The enthalpy of steam at 170 degree Celsius with wetness fraction of 0.25 would

Have enthalpy greater than steam at 170° C with dryness fraction of 0.50

Have enthalpy lower than the enthalpy of saturated water at 170°C

Have enthalpy lower than steam at 170° C with wetness fraction of 0.35

None of Above

#10. Which of the following would have the maximum resistance of heat transfer to a steam pipe when indirect heating is carried out (the product and steam does not intermix)

Air film

Condensate film

Scales

Metal thickness

#11. The power output is least for which

Reciprocating engine based

Gas Turbine based

Extraction condensing steam turbine

Back-pressure steam turbine based

#12. For safe boiler with evaporation capacity of 90 tons/hr, two safety valves is to the fitted with atleast evaporation capacity

20 T/hr of each

30 T/hr of each

40 T/hr of each

50 t/hr of each

#13. The blow down for Safety valve is given by

(Set pressure)/ (Set pressure - reseating pressure)

Reseating pressure/ Set pressure

(Set pressure - reseating pressure)/ (set pressure)

Reseating pressure/ (Reseating pressure - set pressure)

#14. The principle of Mechanical Deaeration is based on which of the following scientific laws?

Dalton's law of partial pressures

Henry's Law

Charles Law

Both A and B.

#15. Which of the following is the most suitable candidate to act as Emergency Shutdown valve?

Gate Valve

Globe Valve

Butterfly Valve

Both A and C

#16. The safety valve of Superheater is set at a pressure the__________ safety valve of boiler drum of the same boiler.

Higher than

Lower than

equal to

Higher or lower than (depends from case to case)

#17. In which of the following units can a boiler’s rating be described?

kg of steam generated at specified pressure and temperature

MW of turbine capacity

Kcal/hour (Rate of heat generation in furnace)

All of the above

#18. Which of the following will be ideal for heat transfer in a heat exchanger

Super heated steam

Saturated dry steam

Wet steam

Hot water

#19. Stream trap is fitted at

Lowest point of steam pipe line

Highest point of steam pipe line

Anywhere in steam pipe line

Final outlet of steam line

#20. Boiler drum and other cylindrical component having internal diameter greater than 600 mm shall be hydraulically tested at

1.5 times the maximum permissible working pressure

1.25 times the maximum permissible working pressure

1.25 times the maximum design pressure

None of above

#21. Water temperature at hydraulic testing of boiler shall be in the range of

20 - 50 °C

18 - 28 °C

25 - 55 °C

40 – 55 °C

#22. I D fan is always located between

Dust collector and Chimney

Boiler furnace and Chimney

Above the Chimney

Near man holes

#23. Safety valve having seat diameter not less than 32 mm should reset at

At least 5 % below but not more than 10 % below safety valve set pressure

At least 2.5 % below but not more than 5 % below safety valve set pressure

At least 2.5 % below but not more than 10 % below safety valve set pressure

At least 1.5 % below but not more than 5 % below safety valve set pressure

#24. FBCB means

Forced Bed Combustion Boiler

Frequent Bed Combustion Boiler

Fluidized Bed Circulation Boiler

Fluidized Bed Combustion Boiler

#25. Evaporation of 2000 kg of water per hour from and at 100° C is

Equivalent evaporation of Boiler B. Evaporation capacity of Boiler

Boiler HP D. Boiler rating

Boiler HP

Boiler rating

#26. While applying hydraulic test to boiler, test pressure to be maintained for

10 min

15 min

30 min

5 min

#27. Inspecting authority certificate of inspection during construction as per IBR (Regulation 4(c) (1)] issued in

Form IV

Form II

Form III-C

Form VI

#28. Which data is not required to calculate boiler efficiency by the indirect method

Steam flow rate

Stack gas temperature

Ambient temperature

Energy content of fuel

#29. The sulphur retention of Fluidised Bed Combustion boilers is dependent on

Temperature of Bed

Pressure of Bed

Porosity of sorption material employed

All of the above

#30. At critical point i.e. p = 225.65 kg/cm2, the latent enthalpy of vaporization is

At critical point i.e. p = 225.65 kg/cm2, the latent enthalpy of vaporization is

Minimum

Zero

Depends on temperature

#31. Which of the following can be used as a tube material (without hampering performance and efficiency) of boiler superheater exposed to a maximum flue gas temperature of 1025 °C (Paper-2)

SA 209

SA 516

SA 213T-11

SA 106

#32. Excessive blow down

Reduces efficiency

Increases make up water

Reduces efficiency I Increase chemical consumption

All of the above

#33. Any closed vessel which is used expressly for generating steam under pressure will be covered under Boiler Act 1923 if volumetric capacity of vessel

Exceeds 25 Ltr

Exceeds 20 Ltr

Exceeds 15 Ltr

Exceeds 50 Ltr

#34. Phosphate hideout is most evident in boiler tubes with

Low mass flow and highest heat flux

Low mass flow and lowest heat flux

High mass flow and highest heat flux

High mass flow and lowest heat flux

#35. RLA stands for

Remnant Life Audit

Reserve Life Audit

Remnant Life Assessment

Repairing Life Audit

#36. For shell type boiler max permitted working pressure is reduced by 5 % when it attains age of

20 years

25 years

50 years

15 years

#37. If electric light is used inside a boiler shell or drum voltage shall not exceed

220 volts

110 volts

24 volts

60 volts

#38. Maximum outlet water temperature of the economiser of high pressure boiler shall be at least,

40 deg F below the superheated steam temp

25 deg F below the superheated steam temp

25 deg F below the saturated steam temp in the boiler drum

40 deg F below the saturated steam temp in the boiler drum

#39. Thermocouple is used for

Measurement of steam flow

Measurement of differential pressure

Measurement of thermal expansion

Measurement of Enthalpy

#40. Manholes of oval type shall be arranged such that

Major axis to be parallel with longitudinal center line of boiler

Minor axis to be parallel with longitudinal center line of boiler

Centre of manhole is offset to the longitudinal center line of boiler

Can be arranged any way

#41. Minimum Boiler plate thickness specified in IBR 1950 is

1/4 inch

1/2 inch

3/8 inch

3/4 inch

#42. As per Indian Boiler Regulation 1950, following is not necessary on a boiler

Safety valve

Economizer

Steam pressure gauge

Water level indicator

#43. Following statement is not true for water level indicators

Every boiler shall have only one means of indicating water level in drum or shell

For every tubular glass water level gauge protectors shall be provided

The minimum length of visible portion of the gauge glass shall be 200 mm

Drain cock or valve with suitable discharge pipe shall be fitted to each water gauge

#44. Following statement is not true for Heat Rate

It is the amount of heat added to produce unit amount of work

It is inversely proportional to efficiency

It is directly proportional to efficiency

It reflects fuel economics

#45. Which of the following statement is not true?

The density of the saturated water in the down comers is greater than the density of the two phase mixture in the risers

Steam drum is provided in once through boiler to separate steam from boiling water

Full boiling to 100 percent quality in water tube is avoided because it would lead to tube burnout or failure

The latent heat value is zero at critical pressure

#46. In a Super heater

Pressure rises, T drops

Pressure rises, T remains constant

Pressure remains constant and T rises

Both pressure and T remains constant

#47. Which condition leads the boiler starvation

Non availability of load in running boiler

Non availability of coal in running boiler

Non availability of feed water in running boiler

None of the above

#48. Which type of coal is having highest percentage of fixed carbon?

Lignite

Bituminous coal

Anthresite

Sub bituminous coal

#49. With reference to demineralization process which one is not true

It is the process of removing dissolved solids

It is the process of removing suspended solids

Cation resins are positively charged hydrogen ions

Anion resins are negatively charged hydroxide ions

#50. What does the turbidity in boiler feed water cause?

Sludge

Scale

Corrosion

Erosion

#51. Equivalent evaporation is the amount of water evaporated in a boiler from and at …..

0°C

273K

100°C

212°C

#52. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by

Throttling calorimeter

Separating calorimeter

Combined separating and throttling calorimeter

Bucket calorimeter

#53. A dense white smoke from a chimney indicates

Insufficient air

Too much air

Correct air

Less turbulence mixing

#54. Higher calorific value of fuel assumes that

It contains H2O in liquid form

It contains H2O in vapour form

It contains H2O in liquid and vapour form

It ignores the presence of H2O

#55. The draught produced by steel chimney as compared to that produced by brick chimney for the same height is

Less

Same

May be more or less

#56. Following is the advantage of supercritical boilers

Reduction in emission

More cycle efficiency

Requires no latent heat addition

All of above

#57. As per the Boilers Act, 1923 (as amended in 2007) Following action is not a punishable

To allow any person to go inside a boiler without proper isolation from other boiler

To use boiler at higher pressure than certified

To use boiler after transferred from one state to another without intimation to boiler authority

To use boiler on provisional order

#58. Proficiency certificate of engineer can be cancelled permanently if holder,

Found guilty in allegations of negligence of duties

Resigns from the company

Transfer to other state

At the age of 58 years

#59. The function of injector is to

Create a vacuum

Pump water to boiler

Add make up water in the system

None of the above

#60. Boiler stays are used to Provide foundation of boiler

Provide support for boiler

Provide flat surfaces from tearing apart

None of the above

Finish

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RAJASTHAN BOILER OPERATION ENGINEER EXAM-2018 (PAPER-1 & 2 ) WITH SOLUTION

Results

#1. The ratio of mass rate of water feeding to the steam-generating tubes to the mass flow rate of generated steam is defined as

#2. In a working Boiler, maximum pressure exits in

#3. What should be the silica percentage in superheated steam for efficient operation of steam turbines?

#4. How many kg of CO2 are produced in complete combustion of 16 kg of Methane?

#5. Size of boiler tube is specified by

#6. The pH of feed water in which hydrazine dosing is practiced

#7. Which is not desirable property of fuel

#8. Calculate the boiler efficiency (in percentage) of certain boiler if Evaporation ratio is 5. Enthalpy difference between saturated steam and feed water is 1500 kcal/kg. Given the Gross Calorific Value of fuel is 10,000 kcal/kg of fuel.

#9. The enthalpy of steam at 170 degree Celsius with wetness fraction of 0.25 would

#10. Which of the following would have the maximum resistance of heat transfer to a steam pipe when indirect heating is carried out (the product and steam does not intermix)

#11. The power output is least for which

#12. For safe boiler with evaporation capacity of 90 tons/hr, two safety valves is to the fitted with atleast evaporation capacity

#13. The blow down for Safety valve is given by

#14. The principle of Mechanical Deaeration is based on which of the following scientific laws?

#15. Which of the following is the most suitable candidate to act as Emergency Shutdown valve?

#16. The safety valve of Superheater is set at a pressure the__________ safety valve of boiler drum of the same boiler.

#17. In which of the following units can a boiler’s rating be described?

#18. Which of the following will be ideal for heat transfer in a heat exchanger

#19. Stream trap is fitted at

#20. Boiler drum and other cylindrical component having internal diameter greater than 600 mm shall be hydraulically tested at

#21. Water temperature at hydraulic testing of boiler shall be in the range of

#22. I D fan is always located between

#23. Safety valve having seat diameter not less than 32 mm should reset at

#24. FBCB means

#25. Evaporation of 2000 kg of water per hour from and at 100° C is

#26. While applying hydraulic test to boiler, test pressure to be maintained for

#27. Inspecting authority certificate of inspection during construction as per IBR (Regulation 4(c) (1)] issued in

#28. Which data is not required to calculate boiler efficiency by the indirect method

#29. The sulphur retention of Fluidised Bed Combustion boilers is dependent on

#30. At critical point i.e. p = 225.65 kg/cm2, the latent enthalpy of vaporization is

#31. Which of the following can be used as a tube material (without hampering performance and efficiency) of boiler superheater exposed to a maximum flue gas temperature of 1025 °C (Paper-2)

#32. Excessive blow down

#33. Any closed vessel which is used expressly for generating steam under pressure will be covered under Boiler Act 1923 if volumetric capacity of vessel

#34. Phosphate hideout is most evident in boiler tubes with

#35. RLA stands for

#36. For shell type boiler max permitted working pressure is reduced by 5 % when it attains age of

#37. If electric light is used inside a boiler shell or drum voltage shall not exceed

#38. Maximum outlet water temperature of the economiser of high pressure boiler shall be at least,

#39. Thermocouple is used for

#40. Manholes of oval type shall be arranged such that

#41. Minimum Boiler plate thickness specified in IBR 1950 is

#42. As per Indian Boiler Regulation 1950, following is not necessary on a boiler

#43. Following statement is not true for water level indicators

#44. Following statement is not true for Heat Rate

#45. Which of the following statement is not true?

#46. In a Super heater

#47. Which condition leads the boiler starvation

#48. Which type of coal is having highest percentage of fixed carbon?

#49. With reference to demineralization process which one is not true

#50. What does the turbidity in boiler feed water cause?

#51. Equivalent evaporation is the amount of water evaporated in a boiler from and at …..

#52. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by

#53. A dense white smoke from a chimney indicates

#54. Higher calorific value of fuel assumes that

#55. The draught produced by steel chimney as compared to that produced by brick chimney for the same height is

#56. Following is the advantage of supercritical boilers

#57. As per the Boilers Act, 1923 (as amended in 2007) Following action is not a punishable

#58. Proficiency certificate of engineer can be cancelled permanently if holder,

#59. The function of injector is to

#60. Boiler stays are used to Provide foundation of boiler

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