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Andhra Pradesh

BOILER OPERATION ENGINEERS EXAMINATIONS

BOILERS - I

Time : 3 Hours Marks : 100

Note : 1) Candidates should attempt Six(6) questions subject to alternative or

limitations, if any, mentioned herein, or in each question. If more are

answered, the last extra answers will be ignored.

2) Parts of the same question must be answered together and must not be

interposed by answer(s) to other question(s).

3) Question No. ONE is compulsory.

4) Candidates should answer the paper in English only.

Q.1 a) What are the causes of fluctuations in working pressure of a boiler ? 05 

 b) Is it possible to re duce feed pump capacity with the overized existing pump ?

If so, how ? 05 

c) Describe soot blowing procedures. 05

d) What is meant by Bio-mass fuel ? Name some of Bio-mass fuels and mention

their Net Calorific Values. 05 

Q.2 a) Explain the principle of CO-GENERATION with a neat sketch. 12 

 b) What are the advantages of Co-generation. 04 

Q.3 a) What is an Air heater ? Discuss briefly about types and their working. 10 

 b) What are the advantages and disadvantages of Air-heating. 06 

Q.4 a) What is the total upward force on a valve disc 3” in dia. when the boiler

steam pressure is 120 kg./sq. cms. 06 

 b) A hollow steel column of external dia. 250 mm has to support an axial load

of 3000 KN. The ultimate stress for steel is 460 N/sq. mm. Find the ID of

column if factor of safety is four. 10 

Q.5 a) Define the words Combustion, Ignition temperature and Teritiary air. 06 

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 b) Calculate the stochiometric amount of air required for liquid fuel with

following constituents when and G.C.V. of fuel is 10,880 Kcal/Kg. 10 

Constituents. % by Weight

Carbon 85.9

Hydrogen 12.0

Oxygen 0.7

 Nitrogen 0.5

Sulphur 0.5

H2O 0.35

Ash 0.05

Q.6 a) What is meant by a Superheater ? Give the classification of super heaters. 06 

 b) What factors are responsible for the superheater fouling ? 06 

c) What precautions should be taken to prevent Air preheater fires ? 04 

Q.7 a) Discuss about De-mineralisation plant with sketch. 12 

 b) What are the advantages of Boiler feed water treatment with Reverse Osmosis

 plant when compared with D.M. plant. 04 

Q.8 a) What are the Precautions to be taken while entering in to a Electro-static

Precipitator ? 05 

 b) Discuss about Island protection in power plants. What happens if it fails ? 05 

c) How do you conclude that bank tube of a water tube is punctured ? How do

you get it repaired ? 06 

Q.9 Answer any FOUR of the following : 16 

a) What is meant by Volatile matter and state it’s role in CFBC boiler. (4 x 4) 

 b) Define Boiler as per Indian Boilers Act.

c) Discuss briefly about Post weld treatment.

d) Name some of the NDT methods useful in Boiler maintenance.

e) Write about Stress Relieving.

f) Distinguish between Permanent Hardness and Temporary Hardness.

g) Discuss briefly about principle on which ESP works.

h) Write short notes on Dolochar.