In a muffle furnace, the muffle_________________?
(A) Retards the heat transfer
(B) Assists in temperature equalisation in the charge
(C) Permits the use of controlled atmosphere for the protection of stock
(D) All
Hearth furnaces are not used for____________________?
(A) Roasting
(B) Melting
(C) Reheating
(D) None of these
Decarburisation of steel__________________?
(A) Is the removal of carbon from iron carbide (Fe3C)
(B) Affects its crystalline structure
(C) Is favoured by CO2
(D) All
Maximum heat transfer in high temperature furnaces is by____________________?
(A) Conduction
(B) Convection
(C) Radiation
(D) Either
Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the_________________?
(A) Quantity & temperature of waste gas
(B) Dust concentration & nature of dust in waste gas
(C) Corrosive nature of the waste gas
(D) All
Pick out the wrong statement?
(A) Bronze is an alloy of copper & tin
(B) Brass is an alloy of copper & zinc
(C) The alloy named ‘German silver’ does not contain any silver
(D) The ability of a material to fracture without appreciable deformation is called its ductility
Reheating furnace (pusher type) is used for heating_____________________?
(A) Ingots
(B) Slabs
(C) Steel coils
(D) Steel sheets
Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about ____________ °C?
(A) 80
(B) 130
(C) 180
(D) 250