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 at Bissoy

• Specific heating capacity of a furnace is expressed as
  ক

  Weight heated/hr

  খ

  Weight heated/furnace volume

  গ

  Weight heated/hr/furnace volume

  ঘ

  None of these
• To reduce the stack loss, heat recovery from flue gas can be done by
  ক

  Preheating of cold stock

  খ

  Preheating of combustion air

  গ

  Steam generation in waste heat boilers

  ঘ

  All of the above
• Which of the following is a directly fired intermittant furnace?
  ক

  Walking beam reheating furnace

  খ

  Reverberatory furnace

  গ

  Tower furnace

  ঘ

  Tunnel kiln
• Furnace pressure is normally controlled by regulating the
  ক

  Air pressure

  খ

  Fuel gas pressure

  গ

  Speed of I.D. fan

  ঘ

  Damper
• Thermal efficiency of an open hearth furnace may be about __________ percent.
  ক

  5

  খ

  20

  গ

  50

  ঘ

  80
• Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
  ক

  10-15

  খ

  25-30

  গ

  45-50

  ঘ

  65-70
• 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
• Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.
  ক

  80

  খ

  130

  গ

  180

  ঘ

  250
• 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
• Furnace aerodynamics is related to the __________ in the furnace.
  ক

  Movement of gases

  খ

  Measurement of flue gas volume

  গ

  Temperature control

  ঘ

  Pressure adjustment
• 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