41. Ostwald charts are meant for
Computing the excess/deficiency of combustion air
Calculation of flue gas temperature
Computation of flue gas analysis
None of these
✅ The correct answer is option A.
Furnace Technology MCQs
42. Maximum heat transfer in high temperature furnaces is by
Conduction
Convection
Radiation
Either A, B or C; depends on the type of furnace
✅ The correct answer is option C.
43. Which of the following is a directly fired intermittant furnace?
Walking beam reheating furnace
Reverberatory furnace
Tower furnace
Tunnel kiln
✅ The correct answer is option B.
44. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
20
40
60
80
✅ The correct answer is option D.
45. __________ is an indirectly heated furnace.
Open hearth furnace
Muffle furnace
Soaking pit
Reheating furnace
✅ The correct answer is option B.
46. Example of an indirectly heated furnace is
Hood annealing furnace
Muffle furnace
Both A and B
Neither A nor B
✅ The correct answer is option C.
47. An example of shaft furnace is the
L.converter
Glass melting tank
Blast furnace
Soaking pit
✅ The correct answer is option C.
48. The rate of scaling of furnace stock depends upon the
Temperature
Time
Nature of atmosphere
All of the above
✅ The correct answer is option D.
49. 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
✅ The correct answer is option B.
50. The main function of a muffle in the muffle furnace is to
Protect the charge from the effects of the products of combustion
Smooth out temperature inequalities on the combustion side of the muffle wall
Both A & B
Neither A nor B
✅ The correct answer is option C.