ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Google
   
 
Categories >> Engineering >> Mechanical Engineering
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions (3079)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3290)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13338)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2363)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (416)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (80)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (163)
 Instrumentation interview questions  Instrumentation Interview Questions (2382)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (106)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (44)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (78)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1196)
Question
What is daught, what kind of draught used in boiler chimney
 Question Submitted By :: Mechanical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Daught is nothing but the pressure difference between
furnace and atmosphere. there is two types of daught, one is
natural circulation and second is forced circulation. in
natural circulation the flue gases passes due to natural
pressure gradient exist due to temp and density difference.
in forced circulation a mechanical device is used to create
the pressure gradient, it may be fan/blower. and the
position also decide the type. if it is placed after the
furnace then it is termed as induced draught. and if it is
placed before the furnace then it will termed as forced daught.

this daught is to make to escape the flue gases from the
systum. in boiler force daught is used.
 
Is This Answer Correct ?    55 Yes 1 No
Santosh Raikar
 
Answer
# 2
draught is like a pressure due to which flow of flue gases through chimney is takes place..........in a chimney induced draft is used. 
Is This Answer Correct ?    52 Yes 9 No
Manisha
 
 
 
Answer
# 3
Yes. The draft used is Induced draft. The draft is created
by a ID fan( Induced Draft). This fan sucks the flue gas
from the boiler furnace and forces out through chimney.
Usually the fan is controlled by a VFD where we can reduce
or increase the speed of the fan by adjusting the frequency.
As the power consumption of these fans are high, it is
better advisable to go with VFD( Variable Frequency Drive).
The technical specification of these fans can be googled.
Thanks.
 
Is This Answer Correct ?    35 Yes 12 No
Magesh
 
Answer
# 4
The definations given by Mangesh and Santosh are right.
->the problem with the Forced daught boilers is that the
pressure in the Furnace is higher than the outside so when
there is leakage or if you open a inspection window the
flame will burst out.
->the problem with the Induce daught is that the pressure
is negative in the furnace. so there is a chance that
outside air can contaminate the furnace and combustion
through leakage or openings of inspection window.

--> so normaly balanced daught is used in which where both
fans (force daugth & induce daught fan) are provide one
before furnace and one after furnace.
these fans keeps the furnace pressure in balanced condition,
generally the pressure inside the furnace is kept negative
5-10 mm water column.
 
Is This Answer Correct ?    11 Yes 3 No
Pratik Patel
 
Answer
# 5
the difference of pressure is known as drought.
there are many type of drought we can use the drought
produced by means of chimney alone is known as chimney
drought.it is a natural drought
 
Is This Answer Correct ?    4 Yes 2 No
Deepak
 
Answer
# 6
draught is like a pressure due to which flow of flue gases through chimney is takes place..........in a chimney induced draft is used.
there are two types of draught.1.natural draught,2. artificial draught
 
Is This Answer Correct ?    3 Yes 2 No
Ravi Kumar Singh
 
Answer
# 7
DRAUGHT IS A DEVICE WHICH CREATES A PRESSURE DIFFERENCE TO
MAINTAIN THE FLOW OF ATMOSPHERIC AIR AND THE FLOW OF FLU
GASES.....
 
Is This Answer Correct ?    4 Yes 3 No
Manish Mudhliyar
 
Answer
# 8
Draught in Boiler chimney is Induced Draught which is
generated by induced draught fan.
This Fan is mounted after Esp(Electro static precipitator)
and Before Chimney.
Is Funtion is to suck Flue Gas from Boiler , Esp & Flue gas
duct to chiney.
This draught is manual one.
While the natural draught is created by temprature
difference between the flue gas inside the chimney and
outside the chimney.
Hence the Pressure difference is generated.
hence Flue gas Tend to move Upward.
from hight to low temprature.
more over Pressure inside the chimney is more than
atmospheric pressure hence it moves outward.
 
Is This Answer Correct ?    3 Yes 5 No
Parth Chaudhary
 

 
 
 
Other Mechanical Engineering Interview Questions
 
  Question Asked @ Answers
 
define a flash in mould making?   3
Examples of good insulators. RRB 3
what is difference between pipe and tube. Jaiprakash 4
what is chemical formula of bauxite   2
i need bhel written test question paper for the post of mechanical engineer (je)   1
How to convert from HP to BHP or CC to Bhp please explain???????? HP 1
What is daught, what kind of draught used in boiler chimney Nalco 8
which kind of force act when the piston slides inside the cylinder?and how to calculate that force or stress theoritically.   4
Composition of bronze Bhel 4
what is shaft Hero-Honda 2
What is equivalent spring constant for spring in parallel? Bhel 3
In volute casing the discharge area is more. so as per bernoulli's principle the pressure must be reduces also from the basics, pressure = Force/Area. so pressure and area are inversily proportional. By considering these two basic rules pressure must be reduces. But in any centrifugal pump, the pressure is increasing. How the velocity is converted into pressure. In my view only head is increases but how the pressure increases?   2
 
For more Mechanical Engineering Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
   
Copyright 2013  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  KalAajKal.com