Mechanical Engineering - Steam Boilers and Engines - Discussion

1. 

The object of producing draught in a boiler is

[A]. to provide an adequate supply of air for the fuel combustion
[B]. to exhaust the gases of combustion from the combustion chamber
[C]. to discharge the gases of combustion to the atmosphere through the chimney
[D]. all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Rn Mahapatra said: (Nov 8, 2013)  
I can't understand this kindly explain me that why the answer is d?

Beeresh said: (Apr 1, 2014)  
Draught means partial pressure between atom to the chimney. Sufficient air to be needed for complete combustion, after combustion elve gas to be exhaust. So we have balance the pressure.

A.N Sanjrani said: (Jan 31, 2015)  
I think in process of combustion; drought means from suction to exhaust as in a first step air and fuel ratio is sucked and then after power accomplishment, from exhaust all flue gases were leave the chimney.

Saikumar said: (Mar 11, 2015)  
A fuel-heated boiler must provide air to oxidize its fuel. Early boilers provided this stream of air, or drought, through the natural action of convection in a chimney connected to the exhaust of the combustion chamber.

Since the heated flue gas is less dense than the ambient air surrounding the boiler, the flue gas rises in the chimney, pulling denser, fresh air into the combustion chamber.

Shivram said: (Sep 7, 2016)  
Good @Saikumar.

Abdalah said: (Jan 2, 2017)  
I want know tube thickness size and long for boiler 3 ton per hours also plate thickness. Please describe it.

Nishu said: (Jan 25, 2017)  
The correct answer will be C.

Malaz said: (Nov 8, 2017)  
I can't understand. Please explain me that why the answer is D.

Pawan Kumar said: (Nov 17, 2017)  
View Q.14 for Understanding. What is draught?

Kundan Kr said: (Dec 9, 2017)  
I also agree with answer c.

Satish said: (May 6, 2018)  
The Correct answer is C.

Sergin said: (Feb 13, 2019)  
I think the answer D is correct because all the options serve the purpose for a draught.

Rakesh Yadav said: (Mar 29, 2019)  
Draught producing mainly two types.

One is mechanical & second is natural. Mechanical draught is producing by using an induced fan which sucks flue gases take place in the chimney.

Rupesh Patil said: (Dec 20, 2019)  
Boiler draught is defined as the small difference between the pressure of outside cold atmospheric air and that of gases within a furnace or chimney. The draught is necessary to force air through the fuel grate to help in proper combustion of fuel and to remove the products of combustion.

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