2384. Calcination of limestone to produce lime is done in a __________ kiln.
Tunnel
Rotary
Vertical shaft
Both B and C
✅ The correct answer is option D.
2389. 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
✅ The correct answer is option B.
2395. Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
Coke oven
Blast furnace stoves
Beehive coke oven
High pressure boiler
✅ The correct answer is option D.
2400. Which of the following is a heat treatment furnace?
Muffle furnace
Annealing furnace
Reheating furnace
Rotary kiln
✅ The correct answer is option B.
2405. The amount of combustible escaping uncon-sumed from the furnace, depends upon the
Air supplied and furnace temperature
Burner design (thoroughness of mixing versus stratification)
Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
All of the above
✅ The correct answer is option D.
2410. Which of the following is a rotary furnace?
Lime kiln
Soaking pit
Stoves
Annealing furnace
✅ The correct answer is option A.
2415. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
< 2
< 5
< 8
< 10
✅ The correct answer is option A.
2379. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
Resistance
Arc
Low frequency induction
None of these
✅ The correct answer is option B.
2338. In declining balance method of depreciation calculation, the
value of the asset decreases linearly with time.
annual cost of depreciation is same every year.
annual depreciation is the fixed percentage of the property value at the beginning of the particular year.
none of these.
✅ The correct answer is option C.
2342. __________ taxes are based on gross earnings.
Property
Excise
Income
Capital gain
✅ The correct answer is option C.