Furnace Technology MCQ

Test your knowledge with important Furnace Technology MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Furnace Technology MCQs on Bissoy. Bissoy App

• Maximum thermal efficiency of boiler may be about __________ percent.
  ক

  10

  খ

  25

  গ

  65

  ঘ

  90
• Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
  ক

  20

  খ

  40

  গ

  60

  ঘ

  80
• The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent.
  ক

  15

  খ

  40

  গ

  70

  ঘ

  85
• An example of shaft furnace is the
  ক

  L.D. converter

  খ

  Glass melting tank

  গ

  Blast furnace

  ঘ

  Soaking pit
• In producer gas making furnace, steam is added along with air to mainly control the
  ক

  Fusion of coal ash & clinker formation

  খ

  C. V. of producer gas

  গ

  Temperature of producer gas

  ঘ

  Tar content in producer gas
• Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an
  ক

  Economiser

  খ

  Steam superheater

  গ

  Air preheater

  ঘ

  All of the above
• Heat balance of furnace provides means of determining the
  ক

  Thermal efficiency of the process

  খ

  Sources of heat losses

  গ

  Scope of reduction of heat losses

  ঘ

  All of the above
• Which furnace employs natural draft?
  ক

  Coke oven

  খ

  Boiler

  গ

  Rotary kilns

  ঘ

  L.D. converter
• Unit of furnace loading is
  ক

  Ton stock/hr/m² hearth area

  খ

  Ton stock/hr

  গ

  Ton stock/m² hearth area

  ঘ

  Both B and C
• Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an
  ক

  Blast furnace

  খ

  Steam boiler

  গ

  Salt bath furnace

  ঘ

  Annealing furnace
• Turn down ratio of a burner
  ক

  Should be as low as possible i.e., 1 : 2

  খ

  Should be 1:1 for a batch type furnace.

  গ

  Is the ratio of maximum to minimum permissible heat input rates

  ঘ

  Is normally much more for a continuous furnace as compared to a batch furnace
• Soaking pits are meant for heating steel
  ক

  Ingots

  খ

  Coils

  গ

  Sheets

  ঘ

  Slabs
• In a furnace operation, which is not preheated?
  ক

  Solid fuels

  খ

  Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)

  গ

  Both A and B

  ঘ

  Neither A nor B
• Turndown ratio of a burner gives an idea of the __________ in the furnace.
  ক

  Range of fuel firing rates

  খ

  Volume of the combustion chamber

  গ

  Maximum heat input rate only

  ঘ

  Minimum heat input rate only
• In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?
  ক

  Recuperator

  খ

  Regenerator

  গ

  Waste heat boiler

  ঘ

  None of these
• Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.
  ক

  250

  খ

  650

  গ

  850

  ঘ

  1000
• Reheating furnace (pusher type) is used for heating
  ক

  Ingots

  খ

  Slabs

  গ

  Steel coils

  ঘ

  Steel sheets
• Shaft furnaces are used for
  ক

  Smelting

  খ

  Calcining

  গ

  Roasting

  ঘ

  All of the above
• The heat recoverable from flue gases of furnaces depends on the
  ক

  Thermal efficiency of furnace

  খ

  Quantity of flue gases

  গ

  Flue gas temperature drop through the furnace

  ঘ

  All of the above
• Regenerators are used for waste heat recovery in
  ক

  By-product coke ovens

  খ

  Beehive coke oven

  গ

  Blast furnace stoves

  ঘ

  Soaking pits
• The purpose of controlling the furnace atmosphere is to prevent surface attack by
  ক

  Oxidation/scaling

  খ

  Decarburising

  গ

  Sulphur penetration

  ঘ

  Either of the above
• Which of the following is not a recuperative furnace?
  ক

  Soaking pit

  খ

  Reheating furnace

  গ

  Steamboiler

  ঘ

  Coke oven
• In a furnace employing forced draught as compared to induced draught,
  ক

  Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced

  খ

  The fan operates hot and hence blades are liable to corrosion and erosion

  গ

  Positive pressure exists in the furnace

  ঘ

  None of these
• Regenerators are normally provided in the
  ক

  Glass melting furnace

  খ

  Open hearth furnace

  গ

  By product coke ovens

  ঘ

  All of the above
• Rotary kilns are used in the
  ক

  Calcination of limestone & dolomite

  খ

  Cement manufacture

  গ

  Both A and B

  ঘ

  Neither A nor B
• In low or standard frequency induction furnace, heat is produced by the
  ক

  Combination of induced current and skin effect

  খ

  Induction and resistance

  গ

  Current flow through a heating element

  ঘ

  None of these
• Which of the following is not an additive for flue gases from furnace to reduce its dew-point?
  ক

  Ammonia

  খ

  Fine dolomite

  গ

  Alkaline powders

  ঘ

  None of these
• Heat transfer rate to the charge/stock in a furnace does not depend upon the
  ক

  Type of fuels viz solid, liquid or gaseous

  খ

  Flue gas temperature

  গ

  Emissivity of refractory walls

  ঘ

  Initial temperature of the charged stock
• Heat transfer rate to the stock/charge in the furnace does not depend upon the
  ক

  Emissivity of the refactory walls

  খ

  Size of the furance

  গ

  Use of waste heat recovery equipments

  ঘ

  Thickness of the stock
• Artificial draught produced by a fan in the furnace can be controlled by the
  ক

  Speed of the fan

  খ

  Damper

  গ

  Variation in the pitch of fan blades

  ঘ

  All of the above