Furnace Technology Mcqs for Chemical - Set 5

1)   Example of an indirectly heated furnace is__________________?

a. Hood annealing furnace
b. Muffle furnace
c. Both A. and B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Both A. and B.

Explanation:
No explanation is available for this question!


2)   In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of_________________?

a. Transportation of coal
b. Drying of coal
c. Combustion of coal by supplying it around the burner
d. Preheating the primary air
Answer  Explanation 

ANSWER: Combustion of coal by supplying it around the burner

Explanation:
No explanation is available for this question!


3)   Which of the following is a directly fired intermittent furnace ?

a. Walking beam reheating furnace
b. Reverberatory furnace
c. Tower furnace
d. Tunnel kiln
Answer  Explanation 

ANSWER: Reverberatory furnace

Explanation:
No explanation is available for this question!


4)   Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?

a. Preheating the combustion air
b. Oxygen enrichment of combustion air
c. Preheating the fuel gas
d. All A., B. & C.
Answer  Explanation 

ANSWER: All A., B. & C.

Explanation:
No explanation is available for this question!


5)   If fuel and air are mixed ahead of the burner, it is called a/an ______________ burner?

a. Premix
b. Outside mixing type
c. Rotary
d. Diffusion
Answer  Explanation 

ANSWER: Premix

Explanation:
No explanation is available for this question!


6)   Heat balance of furnace provides means of determining the_________________?

a. Thermal efficiency of the process
b. Sources of heat losses
c. Scope of reduction of heat losses
d. All A., B. and C.
Answer  Explanation 

ANSWER: All A., B. and C.

Explanation:
No explanation is available for this question!


7)   Means for giving direction to the circulation of gases in furnaces are_____________________?

a. Fans
b. Arrangement of heating stock in the furnaces
c. Location of outlet ports and heating & combustion devices
d. All A., B. and C.
Answer  Explanation 

ANSWER: All A., B. and C.

Explanation:
No explanation is available for this question!


8)   Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about _____________ percent?

a. < 2
b. < 5
c. < 8
d. < 10
Answer  Explanation 

ANSWER: < 2

Explanation:
No explanation is available for this question!


9)   Which of the following accentuates clinkering troubles on furnace grate burning coal ?

a. Low reactivity of carbonised residue containing high proportion of iron & sulphur
b. Low forced draft & fuel bed temperature
c. Thick firebed and preheated primary air
d. All A., B. and C.
Answer  Explanation 

ANSWER: All A., B. and C.

Explanation:
No explanation is available for this question!


10)   Cement Kiln is a___________________?

a. Rotary Kiln
b. Tunnel Kiln
c. Natural draft furnace
d. Batch furnace
Answer  Explanation 

ANSWER: Rotary Kiln

Explanation:
No explanation is available for this question!


11)   Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?

a. Coke oven
b. Blast furnace stoves
c. Beehive coke oven
d. High pressure boiler
Answer  Explanation 

ANSWER: High pressure boiler

Explanation:
No explanation is available for this question!


12)   Reverberatory furnace is used for_____________________?

a. Roasting/reduction of ores
b. Annealing steel coil
c. Heating air
d. Steel melting
Answer  Explanation 

ANSWER: Roasting/reduction of ores

Explanation:
No explanation is available for this question!


13)   Fuel used in B.F. stove is______________________?

a. Pulverised coal
b. Furnace oil
c. Blast furnace gas/mixed gas
d. Coke oven gas
Answer  Explanation 

ANSWER: Blast furnace gas/mixed gas

Explanation:
No explanation is available for this question!


14)   In a furnace operation, which is not preheated ?

a. Solid fuels
b. Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
c. Both A. and B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Both A. and B.

Explanation:
No explanation is available for this question!


15)   The main function of a muffle in the muffle furnace is to__________________?

a. Protect the charge from the effects of the products of combustion
b. Smooth out temperature inequalities on the combustion side of the muffle wall
c. Both A. & B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Both A. & B.

Explanation:
No explanation is available for this question!


16)   Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?

a. Emissivity of the refractory walls
b. Size of the furnace
c. Use of waste heat recovery equipments
d. Thickness of the stock
Answer  Explanation 

ANSWER: Use of waste heat recovery equipments

Explanation:
No explanation is available for this question!


17)   In order to maintain an oxidising atmosphere in a furnace, it should have__________________?

a. More of excess air
b. Less of excess air
c. More of CO in flue gas
d. More of CO2 in flue gas
Answer  Explanation 

ANSWER: More of excess air

Explanation:
No explanation is available for this question!


18)   Which is a regenerative furnace ?

a. Coke oven heating chamber
b. Open hearth furnace
c. Both A. and B.
d. Neither A. nor B.
Answer  Explanation 

ANSWER: Both A. and B.

Explanation:
No explanation is available for this question!


19)   In a furnace employing forced draught as compared to induced draught______________________?

a. Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
b. The fan operates hot and hence blades are liable to corrosion and erosion
c. Positive pressure exists in the furnace
d. None of these
Answer  Explanation 

ANSWER: Positive pressure exists in the furnace

Explanation:
No explanation is available for this question!


20)   An example of recuperative furnace is the__________________?

a. Soaking pit
b. Open hearth furnace
c. Coke ovens
d. None of these
Answer  Explanation 

ANSWER: Soaking pit

Explanation:
No explanation is available for this question!