Q.1
Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
Q.2
In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?
Q.3
Turndown ratio of a burner gives an idea of the __________ in the furnace.
Q.4
Which of the following is not a recuperative furnace?
Q.5
The purpose of controlling the furnace atmosphere is to prevent surface attack by
Q.6
Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.
Q.7
Rotary kilns are used in the
Q.8
Pot furnace which is either regenerative or recupterative, is used in the manufacture of
Q.9
Artificial draught produced by a fan in the furnace can be controlled by the
Q.10
Furnace aerodynamics is related to the __________ in the furnace.
Q.11
Ceramic recuperators compared to metallic recuperators for the same duty
Q.12
Regenerators compared to the recuperators for the same duty
Q.13
Regenerators are used for waste heat recovery in
Q.14
The heat recoverable from flue gases of furnaces depends on the
Q.15
Pick out the wrong statement.
Q.16
While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.
Q.17
Which of the following accentuates clinker-ing troubles on furnace grate burning coal?
Q.18
Ostwald charts are meant for
Q.19
Regenerators are normally provided in the
Q.20
In a furnace employing forced draught as compared to induced draught,
Q.21
Heat transfer rate to the stock/charge in the furnace does not depend upon the
Q.22
Heat transfer rate to the charge/stock in a furnace does not depend upon the
Q.23
Regenerators as compared to recuperators for the same duty
Q.24
Regenerators are installed in
Q.25
Shaft furnaces are used for
Q.26
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the
Q.27
Very high pressure boilers are usually __________ boilers.
Q.28
Which one is not an induced draught furnace?
Q.29
In which of the following furnaces, the gases are sucked through the stock bed from below?
Q.30
Tunnel kilns are usually used for
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