Furnace Technology Thermal efficiency of an open hearth furnace may be about __________ percent. 50 80 20 5 50 80 20 5 ANSWER DOWNLOAD EXAMIANS APP
Furnace Technology Turn down ratio of a burner Is the ratio of maximum to minimum permissible heat input rates Should be 1:1 for a batch type furnace. Is normally much more for a continuous furnace as compared to a batch furnace Should be as low as possible i.e., 1 : 2 Is the ratio of maximum to minimum permissible heat input rates Should be 1:1 for a batch type furnace. Is normally much more for a continuous furnace as compared to a batch furnace Should be as low as possible i.e., 1 : 2 ANSWER DOWNLOAD EXAMIANS APP
Furnace Technology Which furnace employs preheating, heating and soaking zones? Cupola Soaking pit Open hearth furnace Reheating furnace Cupola Soaking pit Open hearth furnace Reheating furnace ANSWER DOWNLOAD EXAMIANS APP
Furnace Technology Ceramic recuperators compared to metallic recuperators for the same duty Are less costly Occupy more space Are lighter Have higher pressure differential between flue gas & air side Are less costly Occupy more space Are lighter Have higher pressure differential between flue gas & air side ANSWER DOWNLOAD EXAMIANS APP
Furnace Technology In order to maintain a reducing atmosphere in a furnace, it should have CO in flue gas High excess air No O₂ in flue gas None of these CO in flue gas High excess air No O₂ in flue gas None of these ANSWER DOWNLOAD EXAMIANS APP
Furnace Technology The heating capacity of muffle furnace depends on the Both A & B Neither A nor B Surface area & emissivity of the stock Properties of the muffle wall (temperature, area, emissivity) Both A & B Neither A nor B Surface area & emissivity of the stock Properties of the muffle wall (temperature, area, emissivity) ANSWER DOWNLOAD EXAMIANS APP
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