Furnace Technology Mcqs for Chemical - Set 7

1)   Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above _____________ °C, because corrosion prevails at higher temperatures?

a. 350
b. 750
c. 1050
d. 1250
Answer  Explanation 

ANSWER: 750

Explanation:
No explanation is available for this question!


2)   In reverberatory furnace, charge is heated mainly by__________________?

a. Conduction
b. Natural convection
c. Radiation of heat from the roof of the combustion chamber
d. None of these
Answer  Explanation 

ANSWER: Radiation of heat from the roof of the combustion chamber

Explanation:
No explanation is available for this question!


3)   Which one shows the diagrammatic heat balance in a furnace ?

a. Sankey diagram
b. Cox chart
c. Ostwald chart
d. None of these
Answer  Explanation 

ANSWER: Sankey diagram

Explanation:
No explanation is available for this question!


4)   _____________ atmosphere is maintained inside an iron blast furnace?

a. Oxidising
b. Reducing
c. Inert
d. Decarburising
Answer  Explanation 

ANSWER: Reducing

Explanation:
No explanation is available for this question!


5)   If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an ______________ furnace?

a. Sidefired
b. Underfired
c. Covered
d. Recirculating
Answer  Explanation 

ANSWER: Underfired

Explanation:
No explanation is available for this question!


6)   Large tonnage of refractory bricks are dried in a_____________________?

a. Shaft furnace
b. Rotary hearth furnace
c. Tunnel kiln
d. Muffle furnace
Answer  Explanation 

ANSWER: Tunnel kiln

Explanation:
No explanation is available for this question!


7)   A refractory wall separating the stock and the source of heat is provided in a__________________?

a. Updraft kiln
b. Muffle furnace
c. Continuous furnace
d. None of these
Answer  Explanation 

ANSWER: Muffle furnace

Explanation:
No explanation is available for this question!


8)   Turndown ratio of a burner gives an idea of the ______________ in the furnace?

a. Range of fuel firing rates
b. Volume of the combustion chamber
c. Maximum heat input rate only
d. Minimum heat input rate only
Answer  Explanation 

ANSWER: Range of fuel firing rates

Explanation:
No explanation is available for this question!


9)   Which is a continuous furnace ?

a. Coke ovens
b. Annealing furnace
c. Glass tank furnace
d. None of these
Answer  Explanation 

ANSWER: Glass tank furnace

Explanation:
No explanation is available for this question!


10)   Overfire burning in a furnace is a phenomenon characterised by____________________?

a. Supply of excess fuel
b. Supply of excess air
c. Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air
d. None of these
Answer  Explanation 

ANSWER: Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air

Explanation:
No explanation is available for this question!


11)   Regenerators are normally provided in the____________________?

a. Glass melting furnace
b. Open hearth furnace
c. By product coke ovens
d. All A., B. and C.
Answer  Explanation 

ANSWER: All A., B. and C.

Explanation:
No explanation is available for this question!


12)   Which furnace employs preheating, heating and soaking zones ?

a. Soaking pit
b. Reheating furnace
c. Open hearth furnace
d. Cupola
Answer  Explanation 

ANSWER: Reheating furnace

Explanation:
No explanation is available for this question!


13)   Fuel economy in an industrial furnace operation cannot be achieved by the use of__________________?

a. Stoichiometric combustion air
b. Non-preheated combustion air
c. Combustion air not enriched with oxygen
d. Recuperators
Answer  Explanation 

ANSWER: Stoichiometric combustion air

Explanation:
No explanation is available for this question!


14)   Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of_________________?

a. Furnace oil with air
b. Furnace oil with oxygen
c. Blast furnace gas with air
d. Blast furnace gas with oxygen
Answer  Explanation 

ANSWER: Blast furnace gas with air

Explanation:
No explanation is available for this question!


15)   Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?

a. Ammonia
b. Fine dolomite
c. Alkaline powders
d. None of these
Answer  Explanation 

ANSWER: None of these

Explanation:
No explanation is available for this question!


16)   The function of an economiser in a boiler is to preheat the _____________________?

a. Feedwater
b. Combustion air
c. Pulverised coal
d. Furnace oil
Answer  Explanation 

ANSWER: Feedwater

Explanation:
No explanation is available for this question!


17)   Which of the following furnaces will have maximum thermal efficiency ?

a. Soaking pits
b. Walking beam reheating furnace
c. Boiler furnace
d. Rotary kilns
Answer  Explanation 

ANSWER: Boiler furnace

Explanation:
No explanation is available for this question!


18)   Ostwald charts are meant for__________________?

a. Computing the excess/deficiency of combustion air
b. Calculation of flue gas temperature
c. Computation of flue gas analysis
d. None of these
Answer  Explanation 

ANSWER: Computing the excess/deficiency of combustion air

Explanation:
No explanation is available for this question!


19)   Pick out the wrong statement ?

a. Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
b. Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures
c. Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness
d. None of these
Answer  Explanation 

ANSWER: None of these

Explanation:
No explanation is available for this question!