91. 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.
Furnace Technology MCQs
92. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.
80
130
180
250
✅ The correct answer is option B.
93. The resistance furnace produces heat by the
Electric arc struck between electrodes and the charge
Flow of current through a heating element
Combination of induced current and skin effect
None of these
✅ The correct answer is option B.
94. 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.
95. Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an
Economiser
Steam superheater
Air preheater
All of the above
✅ The correct answer is option D.
96. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
Ostwald chart
Cox chart
Sankey diagram
None of these
✅ The correct answer is option C.
97. Which of the following is a heat treatment furnace?
Muffle furnace
Annealing furnace
Reheating furnace
Rotary kiln
✅ The correct answer is option B.
98. Fuel used in B.F. stove is
Pulverised coal
Furnace oil
Blast furnace gas/mixed gas
Coke oven gas
✅ The correct answer is option C.
99. Which of the following variables affects the furnace capacity?
Temperature of flue gas
Thermal conductivity of stock
Thickness of heating stock
All of the above
✅ The correct answer is option D.
100. 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.