Coke ovens in steel plant are heated by____________________?
(A) Electricity
(B) Blast furnace gas/mixed gas
(C) Coke oven gas
(D) Both
Specific heating capacity of a furnace is expressed as_____________________?
(A) Weight heated/hr
(B) Weight heated/furnace volume
(C) Weight heated/hr/furnace volume
(D) None of these
Unit of furnace loading is____________________?
(A) Ton stock/hr/m2 hearth area
(B) Ton stock/hr
(C) Ton stock/m2 hearth area
(D) Both
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
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
Regenerators as compared to recuperators for the same duty_________________?
(A) Store smaller quantity of waste heat
(B) Are lighter & compact
(C) Involve higher initial cost
(D) All
Pick out the wrong statement about cavitation?
(A) Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation
(B) Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities
(C) Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise
(D) Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine blades
Dampers are located__________________?
(A) Before the I.D fan
(B) After the I.D. fan
(C) Near the top of the chimney
(D) Anywhere after the I.
The resistance furnace produces heat by the__________________?
(A) Electric arc struck between electrodes and the charge
(B) Flow of current through a heating element
(C) Combination of induced current and skin effect
(D) None of these
An example of indirectly heated furnace is the_________________?
(A) Soaking pit
(B) Muffle furnace
(C) Reheating furnace
(D) None of these