Related Questions

An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
A Resistance
B Arc
C Low frequency induction
D None of these
Solution X contains 40% salt and 60% water by weights, Solution Y contains 25% salt and 75% water. If a mixture of X and Y contains 30% salt. What percent of the weight of this mixture is solution X?
A 10%
B 33.3%
C 40%
D 42.5%
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
In reverberatory furnace, charge is heated mainly by
A Conduction
B Natural convection
C Radiation of heat from the roof of the combustion chamber
D None of these
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
A Arc
B Resistance
C Low frequency induction
D High frequency induction
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
A Graphite powder
B Thoria
C Zircon powder
D Beryllium
In water wall furnace, the heat is transferred to the water walls by
A Convection
B Radiation
C Conduction
D Radiation and conduction
Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by
A Conduction
B Convection
C Both A & B
D Radiation
Heat transfer rate to the stock/charge in the furnace does not depend upon the
A Emissivity of the refactory walls
B Size of the furance
C Use of waste heat recovery equipments
D Thickness of the stock
Heat transfer rate to the charge/stock in a furnace does not depend upon the
A Type of fuels viz solid, liquid or gaseous
B Flue gas temperature
C Emissivity of refractory walls
D Initial temperature of the charged stock

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