Furnace Technology Quiz 2
1 / 50
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as ______ percent?
2 / 50
Reducing atmosphere is maintained in a___________?
3 / 50
Pick out the wrong statement ?
4 / 50
Pulverised fuel fired furnaces employ _______ fuel firing?
5 / 50
The electric furnace in which heat is produced by a combination of induced current and skin effect is called ______ furnace?
6 / 50
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by________?
7 / 50
Regenerators as compared to recuperators for the same duty__________?
8 / 50
Scaling of furnace stock is reduced by ________ in flue gas?
9 / 50
Rate of heat release in a furnace, which is the measure of heat intensity, is defined as__________?
10 / 50
The reason for excessive clinker formation in gas producers is the_______?
11 / 50
The amount of combustible escaping unconsumed from the furnace, depends upon the_________?
12 / 50
Maximum thermal efficiency of boiler may be about ______ percent?
13 / 50
Thermal efficiency of a limestone calcination rotary kiln may be around _______ percent?
14 / 50
Thermal efficiency of an open hearth furnace may be about ______ percent?
15 / 50
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above ______ ?C, because corrosion prevails at higher temperatures?
16 / 50
Shaft furnaces are used for_________?
17 / 50
Large tonnage of refractory bricks are dried in a_______?
18 / 50
Regenerators are used for waste heat recovery in______?
19 / 50
Pot furnace which is either regenerative or recuperative, is used in the manufacture of______?
20 / 50
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about ______ percent?
21 / 50
The resistance furnace produces heat by the___________?
22 / 50
The heating capacity of muffle furnace depends on the__________?
23 / 50
Size of the combustion chamber of a furnace depends upon the _____?
24 / 50
Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about _____ percent?
25 / 50
Neutral atmosphere is maintained in a/an _____ furnace?
26 / 50
The heating capacity of muffle furnace depends on the______?
27 / 50
Ingress of cold air in the furnaces through cracks, charging doors, openings etc _________?
28 / 50
Thermal efficiency of blast furnace stoves used for heating blast (air) may be about ______ percent?
29 / 50
Regenerators compared to the recuperators for the same duty___________?
30 / 50
The function of an economiser in a boiler is to preheat the _______?
31 / 50
The main function of a muffle in the muffle furnace is to___________?
32 / 50
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__________?
33 / 50
Regenerators are normally provided in the______?
34 / 50
Ostwald charts are meant for___________?
35 / 50
The rate of scaling of furnace stock depends upon the__________?
36 / 50
Rotary kilns are used in the______?
37 / 50
Specific heating capacity of a furnace is expressed as_______?
38 / 50
The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about _____ percent?
39 / 50
Regenerators are installed in________?
40 / 50
Soaking pits are meant for heating steel__________?
41 / 50
The purpose of controlling the furnace atmosphere is to prevent surface attack by___________?
42 / 50
Protective gas used in the annealing furnace for steel coil comprises of___________?
43 / 50
Presence of SO2 in furnace gases attacks the ferrous metal by way of__________?
44 / 50
Power required in case of forced draught as compared to induced draught (for the same draught produced) is_____?
45 / 50
Reheating furnace (pusher type) is used for heating_______?
46 / 50
Maximum heat transfer in high temperature furnaces is by______?
47 / 50
Main gas valve in a gaseous fuel burner is a _______ valve?
48 / 50
Overfire burning in a furnace is a phenomenon characterised by______?
49 / 50
Means for giving direction to the circulation of gases in furnaces are_______?
50 / 50
The advantages of firing pulverised coal in the furnace lies in the fact that, it_______?
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