Question is ⇒ An example of a periodic furnace is the, Options are ⇒ (A) blast furnace stoves, (B) blast furnace, (C) coke oven heating chamber, (D) rotary kilns, (E) , Leave your comments or Download question paper.

Question is ⇒ An example of a periodic furnace is the, Options are ⇒ (A) blast furnace stoves, (B) blast furnace, (C) coke oven heating chamber, (D) rotary kilns, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	An example of a periodic furnace is the
A.	blast furnace stoves [Correct Answer]
B.	blast furnace [Wrong Answer]
C.	coke oven heating chamber [Wrong Answer]
D.	rotary kilns [Wrong Answer]
View Answer 2 -1 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ Power required in case of forced draught as compared to induced draught (for the same draught produced) is
same
less
more
either more or less; depends on the flue gas density

⇒ Furnace aerodynamics is related to the __________ in the furnace.
movement of gases
measurement of flue gas volume
temperature control
pressure adjustment

⇒ Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
preheating the combustion air.
oxygen enrichment of combustion air.
preheating the fuel gas.
all (a), (b) & (c).

⇒ Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
43023
25-30
45-50
65-70

⇒ A refractory wall separating the stock and the source of heat is provided in a
updraft kiln
muffle furnace
continuous furnace
none of these

⇒ Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
20
40
65
80

⇒ Specific heating capacity of a furnace is expressed as
weight heated/hr
weight heated/furnace volume
weight heated/hr/furnace volume
none of these

⇒ The rate of scaling of furnace stock depends upon the
temperature
time
nature of atmosphere
all (a), (b) and (c)

⇒ Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an
blast furnace.
steam boiler.
salt bath furnace.
annealing furnace.

⇒ Maximum thermal efficiency of boiler may be about __________ percent.
10
25
65
90

⇒ Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing ?
Ash disposal problem.
Excessive fly ash discharge from the stack.
Higher power consumption in its transportation.
Erosion of induced draft fan blades.

⇒ Hearth furnaces are not used for
roasting
melting
reheating
none of these

⇒ Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?
Economiser.
Regenerator.
Ceramic recuperator.
Waste heat boiler.

⇒ Reducing atmosphere is maintained in a
calcination kiln
blast furnace
soaking pit
L.D. converter

⇒ Regenerators are normally provided in the
glass melting furnace.
open hearth furnace.
by product coke ovens.
all (a), (b) and (c).

⇒ Combustion of fuel in a furnace with oxygen enriched air results in higher
flue gas volume
flame temperature
fuel consumption
stack loss

⇒ In reverberatory furnace, charge is heated mainly by
conduction.
natural convection.
radiation of heat from the roof of the combustion chamber.
none of these.

⇒ The reason for excessive clinker formation in gas producers is the
use of coal/coke containing a high % of fines and ash.
use of fuel having too low an ash fusion temperature.
development of hot spots in the fuel bed and an abnormally high rate of gasification.
all (a), (b) and (c).

⇒ Reverberatory furnace is used for
roasting/reduction of ores
annealing steel coil
heating air
steel melting

⇒ Turn down ratio of a burner
should be as low as possible i.e., 1 : 2.
should be 1:1 for a batch type furnace..
is the ratio of maximum to minimum permissible heat input rates.
is normally much more for a continuous furnace as compared to a batch furnace.

⇒ Main gas valve in a gaseous fuel burner is a __________ valve.
gate
butterfly
globe
none of these

⇒ Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
increasing the draft in the furnace.
preheating the fuel gas.
oxygen enrichment of combustion air.
preheating the combustion air.

⇒ Which of the following is a periodic furnace?
Tunnel kiln
Rotary kiln
Soaking pit
Reheating furnace.

⇒ __________ atmosphere is maintained inside an iron blast furnace.
Oxidising
Reducing
Inert
Decarburising

⇒ Tunnel kilns are usually used for
roasting of pyrites.
drying/tempering of refractories.
reheating of slabs.
melting of glass.

⇒ Rotary kilns are used in the
calcination of limestone & dolomite.
cement manufacture.
both (a) and (b).
neither (a) nor (6).

⇒ Size of the combustion chamber of a furnace depends upon the
heat release rate of the fuel.
preheat temperature of fuel & air.
method of mixing the fuel & air.
all (a), (b) and (c).

⇒ An example of indirectly heated furnace is the
soaking pit
muffle furnace
reheating furnace
none of these

⇒ Ceramic recuperators compared to metallic recuperators for the same duty
are lighter.
occupy more space.
are less costly.
have higher pressure differential between flue gas & air side.

⇒ Oxygen enrichment of combustion air does not result in increase of the
flame temperature.
oxygen in the flue gas.
stack loss.
heat transfer rate in the furnace.