Which of the following is not a recuperative furnace ?
(A) Soaking pit
(B) Reheating furnace
(C) Steam boiler
(D) Coke oven
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?
(A) 50
(B) 65
(C) 85
(D) 99
Which of the following is a batch furnace ?
(A) Cupola
(B) Reheating furnace
(C) Glass tank furnace
(D) None of these
Flue gas outlet temperature from the chimney of any furnace should be ideally about ______________ °C?
(A) 50
(B) 100
(C) 150
(D) 250
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the__________________?
(A) Rate of firing and emissivity of flame
(B) Thermal conductivity of the charge & structural materials of furnace
(C) Nature of process; whether batch, continuous or intermittent
(D) All
Forced recirculation of furnace gases is practised_______________?
(A) To increase heat transfer by convection
(B) To ensure uniform temperature
(C) In furnaces, operating below 750°C
(D) All
Rate of heat release in a furnace, which is the measure of heat intensity, is defined as_________________?
(A) kcal/hr/m3 combustion space
(B) kcal/m3 combustion space
(C) kcal/hr
(D) None of these
Ceramic recuperators compared to metallic recuperators for the same duty_________________?
(A) Are lighter
(B) Occupy more space
(C) Are less costly
(D) Have higher pressure differential between flue gas & air side
Regenerators compared to the recuperators for the same duty__________________?
(A) Occupy more space
(B) Are less costly
(C) Are of smaller size
(D) All
Combustion of fuel in a furnace with oxygen enriched air results in higher__________________?
(A) Flue gas volume
(B) Flame temperature
(C) Fuel consumption
(D) Stack loss