A. Saving in fuel consumption
B. Reduction in scale losses
C. Increase in flame temperature
D. All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
Last Updated: March 11, 2019
Related MCQs
- Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent?
- Very high pressure boilers are usually __________ boilers?
- Pot furnace which is either regenerative or recuperative, is used in the manufacture of__________?
- Soaking pits are meant for heating steel__________?
- Rotary kilns are used in the__________?
- While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C?
- Power required in case of forced draught as compared to induced draught (for the same draught produced) is__________?
- Thermal efficiency of furnaces can be improved by__________?
- In producer gas making furnace, steam is added along with air to mainly control the__________?
- In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the__________?
- Presence of SO2 in furnace gases attacks the ferrous metal by way of__________?
- Regenerators are installed in__________?
- Shaft furnaces are used for__________?
- Reheating furnace (pusher type) is used for heating__________?
- Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C?
- Protective gas used in the annealing furnace for steel coil comprises of__________?
- Artificial draught produced by a fan in the furnace can be controlled by the__________?
- Which of the following is the most suitable for preheating combustion air above 650°C ?
- The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace?
- Thermal efficiency of an open hearth furnace may be about __________ percent?
- Which of the following is not a directly fired furnace ?
- Air filtration in a furnace__________?
- Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C?
- Regenerators are used for waste heat recovery in__________?
- Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?
- In a muffle furnace, the muffle__________?
- Hearth furnaces are not used for__________?
- Decarburisation of steel__________?
- Maximum heat transfer in high temperature furnaces is by__________?
- Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the__________?
- Rate of heat release in a furnace, which is the measure of heat intensity, is defined as__________?
- Ceramic recuperators compared to metallic recuperators for the same duty__________?
- Regenerators compared to the recuperators for the same duty__________?
- Combustion of fuel in a furnace with oxygen enriched air results in higher__________?
- Which is not a hearth furnace ?
- Turn down ratio of a burner__________?
- Main gas valve in a gaseous fuel burner is a __________ valve?
- Pulverised fuel fired furnaces employ __________ fuel firing?
- Which of the following is a periodic furnace ?
- Furnace aerodynamics is related to the __________ in the furnace?
- The heating capacity of muffle furnace depends on the__________?
- The heating capacity of muffle furnace depends on the__________?
- In salt bath furnace, heat is transferred to the charge mainly by __________?
- An example of shaft furnace is the__________?
- Which of the following is not a recuperative furnace ?
- The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent?
- Which of the following is a batch furnace ?
- Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C?
- In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the__________?
- Forced recirculation of furnace gases is practised__________?
- An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace?