TSEE MCQ 7
furnace
05.
Which of the following variables affects the furnace capacity?
(A)
Temperature of flue gas (B) Thermal conductivity of stock (C) Thickness of
heating stock (D) All (A), (B) and (C)
Answer:
Option D
06.
The purpose of controlling the furnace atmosphere is to prevent surface attack
by (A) Oxidation/scaling (B) Decarburising (C) Sulphur penetration (D) Either
of the above
Answer:
Option D
07.
Scaling of furnace stock is reduced by __________ in flue gas. (A) CO (B) H2
(C) High CO/CO2 (D) All (A), (B) & (C)
Answer:
Option D
08.
Which is not accomplished in an underfired furnace?
(A)
Increase in heating capacity/m2 of floor space
(B)
Elimination of cold spot at the bottom of the charge
(C)
Reduction in the temperature of furnace gases
(D)
Protection of the periphery of the charge from excessive radiation
Answer:
Option A
10.
Circulation of gases in furnace is caused by the
(A)
Change in volume during a change of temperature
(B)
Difference in density between hot and cold gases
(C)
Furnace pressure in conjunction with draft in flues
(D)
All (A), (B) and (C)
Answer:
Option D
11.
Forced re circulation of furnace gases is practiced
(A)
To increase heat transfer by convection
(B)
To ensure uniform temperature
(C)
In furnaces, operating below 750°C
(D)
All (A), (B) and (C)
Answer:
Option D
12.
Which of the following variables does not affect the furnace capacity?
(A)
Size of the furnace (B) Gas velocity in furnace (C) Ratio of wall surface to
surface of stock (D) None of these
Answer:
Option D
15.
Flue gas outlet temperature from the chimney of any furnace should be ideally
about __________ °C.
(A)
50 (B) 100 (C) 150 (D) 250
Answer:
Option C
16.
Which of the following advantages is not associated with the use of preheated
air for combustion of a fuel in the furnace?
(A)
Increase in calorific value of the fuel (B) Increase in flame temperature (C) Reduction
in scale losses (D) Saving in fuel consumption
Answer:
Option A
17.
Which of the following is a batch furnace?
(A)
Cupola (B) Reheating furnace (C) Glass tank furnace (D) None of these
Answer:
Option A
18.
The thermal efficiency of an air/fuel gas preheating recuperator may be as high
as __________ percent.
(A)
50 (B) 65 (C) 85 (D) 99
Answer:
Option C
20.
Which of the following is not a recuperative furnace?
(A)
Soaking pit (B) Reheating furnace (C) Steam boiler (D) Coke oven
Answer:
Option D
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