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MCQs

Total Questions : 5013 | Page 67 of 502 pages
Question 661. The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the
  1.    Minimum fluidisation velocity
  2.    Terminal velocity
  3.    Elutriation velocity
  4.    Superficial velocity
 Discuss Question
Answer: Option C. -> Elutriation velocity
Question 662. __________ of hard alloy and tool steel is done to make it easily machinable.
  1.    Case carburising
  2.    Tempering
  3.    Normalising
  4.    Annealing
 Discuss Question
Answer: Option B. -> Tempering
Question 663. Ultimate strength in tension as compared to that in shear for steel is
  1.    Half
  2.    One third
  3.    One and half times
  4.    One fourth
 Discuss Question
Answer: Option C. -> One and half times
Question 664. The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is
  1.    Conduction
  2.    Convection
  3.    Both A & B
  4.    Radiation
 Discuss Question
Answer: Option D. -> Radiation
Question 665. Sub zero treatment of steel is done to
  1.    Suppress martensite transformation
  2.    Enhance its working performance in sub zero atmosphere
  3.    Reduce the retained austenite in hardened steel
  4.    Induce temper brittleness after its hardening
 Discuss Question
Answer: Option C. -> Reduce the retained austenite in hardened steel
Question 666. __________ can replace tungsten in high speed steel.
  1.    Chromium
  2.    Vanadium
  3.    Cobalt
  4.    Molybdenum
 Discuss Question
Answer: Option D. -> Molybdenum
Question 667. 'Flare tower' used in industry is meant for
  1.    Venting off (after burning) the excess inflammable/toxic gases at high pressure
  2.    Absorbing the pollutant gases from the furnace exhaust
  3.    Cooling of furnace exhaust gases
  4.    None of these
 Discuss Question
Answer: Option A. -> Venting off (after burning) the excess inflammable/toxic gases at high pressure
Question 668. A jig is used while __________ a hole.
  1.    Boring
  2.    Counter boring
  3.    Drilling
  4.    Enlarging
 Discuss Question
Answer: Option C. -> Drilling
Question 669. Which of the following heat treatment processes is usually applied to castings ?
  1.    Tempering
  2.    Annealing
  3.    Normalising
  4.    Carburising
 Discuss Question
Answer: Option D. -> Carburising
Question 670. Boiler draught of 10 mm water column is equivalent to
  1.    1 kgf/m²
  2.    10 kgf/m²
  3.    10 kgf/mm²
  4.    1 kgf/mm²
 Discuss Question
Answer: Option B. -> 10 kgf/m²

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