Pot furnace which is either regenerative or recuperative, is used in the manufacture of____________________?
(A) Glass
(B) Stainless steel
(C) Potteries
(D) Refractory bricks
Soaking pits are meant for heating steel_________________?
(A) Ingots
(B) Coils
(C) Sheets
(D) Slabs
Pick out the wrong statement?
(A) Wrought iron contains about 0.02% carbon
(B) Wrought iron cannot be easily forged and welded
(C) The chilled cast iron does not contain graphite
(D) Spheroidal grey cast iron contains graphite flakes
Pick out the correct statement?
(A) Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero
(B) Melting of ice involves increase in enthalpy and a decrease in randomness
(C) The internal energy of an ideal gas depends only on its pressure
(D) Maximum work is done under reversible conditions
In low or standard frequency induction furnace, heat is produced by the_______________________?
(A) Combination of induced current and skin effect
(B) Induction and resistance
(C) Current flow through a heating element
(D) None of these
The rate of scaling of furnace stock depends upon the_________________?
(A) Temperature
(B) Time
(C) Nature of atmosphere
(D) All
The reason for excessive clinker formation in gas producers is the_____________________?
(A) Use of coal/coke containing a high % of fines and ash
(B) Use of fuel having too low an ash fusion temperature
(C) Development of hot spots in the fuel bed and an abnormally high rate of gasification
(D) All
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by__________________?
(A) Conduction
(B) Convection
(C) Radiation
(D) Cannot be predicted
Pick out the wrong statement?
(A) The toughness of a material decreases, when it is heated
(B) Crane hooks are normally made of wrought iron
(C) Cold working of a metal decreases its fatigue strength
(D) The temperature at which new grains are formed in a metal is known as the recrystallisation temperature
Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the__________________?
(A) Physical nature, ash content and fineness of the coal
(B) Amount of excess air supplied and load on the boiler
(C) Type of burner and combustion chamber
(D) All