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  • Question
  • Malleable cast iron is produced


  • Options
  • A. by adding magnesium to molten cast iron
  • B. by quick cooling of molten cast iron
  • C. from white cast iron by annealing process
  • D. none of these

  • Correct Answer
  • from white cast iron by annealing process 


  • Engineering Materials problems


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    • 1. Specify the sequence correctly

    • Options
    • A. Grain growth, recrystallisation, stress relief
    • B. Stress relief, grain growth, recrystallisation
    • C. Stress relief, recrystallisation, grain growth
    • D. Grain growth, stress relief, recrystallisation
    • Discuss
    • 2. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

    • Options
    • A. eutectic cast irons
    • B. hypo-eutectic cast irons
    • C. hyper-eutectic cast irons
    • D. none of these
    • Discuss
    • 3. A small percentage of boron is added to steel in order to

    • Options
    • A. increase hardenability
    • B. reduce machinability
    • C. increase wear resistance
    • D. increase endurance strength
    • Discuss
    • 4. In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled

    • Options
    • A. in still air
    • B. slowly in the furnace
    • C. suddenly in a suitable cooling medium
    • D. any one of these
    • Discuss
    • 5. The percentage of carbon in cast iron varies from

    • Options
    • A. 0.1 to 0.5
    • B. 0.5 to 1
    • C. 1 to 1.7
    • D. 1.7 to 4.5
    • Discuss
    • 6. Shock resisting steels should have

    • Options
    • A. low wear resistance
    • B. low hardness
    • C. low tensile strength
    • D. toughness
    • Discuss
    • 7. In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

    • Options
    • A. 0.2
    • B. 0.4
    • C. 0.6
    • D. 0.8
    • Discuss
    • 8. When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

    • Options
    • A. zero
    • B. one
    • C. ?/2
    • D. ?
    • Discuss
    • 9. In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ?/?n is

    • Options
    • A. equal to one
    • B. equal to 2
    • C. less than 2
    • D. greater than 2
    • Discuss
    • 10. For high speed engines, the cam follower should move with

    • Options
    • A. uniform velocity
    • B. simple harmonic motion
    • C. uniform acceleration and retardation
    • D. cycloidal motion
    • Discuss


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