Which is not a hearth furnace ?
(A) Glass tank furnace
(B) Open hearth furnace
(C) Cupola
(D) Reheating furnace
Turn down ratio of a burner____________________?
(A) Should be as low as possible i.e., 1 : 2
(B) Should be 1:1 for a batch type furnace
(C) Is the ratio of maximum to minimum permissible heat input rates
(D) Is normally much more for a continuous furnace as compared to a batch furnace
Main gas valve in a gaseous fuel burner is a ______________ valve?
(A) Gate
(B) Butterfly
(C) Globe
(D) None of these
Pulverised fuel fired furnaces employ ______________ fuel firing?
(A) Horizontal
(B) Vertical
(C) Tangential
(D) All
Which of the following is a periodic furnace ?
(A) Tunnel kiln
(B) Rotary kiln
(C) Soaking pit
(D) Reheating furnace
Furnace aerodynamics is related to the _____________ in the furnace?
(A) Movement of gases
(B) Measurement of flue gas volume
(C) Temperature control
(D) Pressure adjustment
Which of the following is not a directly fired furnace ?
(A) By-product coke oven
(B) Calcination kiln
(C) Sintering furnace
(D) Open hearth furnace
Air filtration in a furnace___________________?
(A) Reduces its thermal efficiency
(B) Is indicated by flame sting out
(C) Increases the flue gas temperature
(D) None of these
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _____________ °C?
(A) 250
(B) 650
(C) 850
(D) 1000
Regenerators are used for waste heat recovery in____________________?
(A) By-product coke ovens
(B) Beehive coke oven
(C) Blast furnace stoves
(D) Soaking pits