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MCQs

Total Questions : 5013 | Page 65 of 502 pages
Question 641. Factor of safety is the ratio of the __________ stress to the working stress.
  1.    Tensile
  2.    Compressive
  3.    Yield
  4.    Bearing
 Discuss Question
Answer: Option C. -> Yield
Question 642. Electrolytic reduction cell used for conversion of calcined Al2O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to
  1.    Achieve very high purity of aluminium (99.9%)
  2.    Keep the electrolyte in liquid condition by the generation of heat
  3.    Electrolytically dissociate alumina
  4.    Both(b) & (c)
 Discuss Question
Answer: Option D. -> Both(b) & (c)
Question 643. In radiative heat transfer, a grey surface is the one, which has
  1.    Emissivity independent of wavelength
  2.    Grey appearance to the eye
  3.    Zero reflectivity
  4.    Equal brightness in all directions
 Discuss Question
Answer: Option A. -> Emissivity independent of wavelength
Question 644. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)
  1.    T
  2.    1/T
  3.    T²
  4.    1/T²
 Discuss Question
Answer: Option A. -> T
Question 645. Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.
  1.    597
  2.    959
  3.    1147
  4.    1493
 Discuss Question
Answer: Option D. -> 1493
Question 646. Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
  1.    723
  2.    959
  3.    1147
  4.    1493
 Discuss Question
Answer: Option A. -> 723
Question 647. High speed steel tools retain their hardness upto a temperature of __________ °C.
  1.    500
  2.    750
  3.    900
  4.    1100
 Discuss Question
Answer: Option C. -> 900
Question 648. Super conduction in metals is observed at a temperature of __________ °K.
 Discuss Question
Answer: Option C. -> 900
Question 649. Rain drops falling through atmospheric air attain limited terminal velocity, because of
  1.    Upward thrust due to air
  2.    Viscous force exerted by air
  3.    Surface tension effects of water
  4.    Force of gravity
 Discuss Question
Answer: Option B. -> Viscous force exerted by air
Question 650. The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system
  1.    Is as light as possible
  2.    Has very high C.O.P
  3.    Employs minimum quantity of refrigerant
  4.    Consumer minimum horse power
 Discuss Question
Answer: Option A. -> Is as light as possible

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