Addition of small amount of ________________ to grey cast iron is done to produce nodular grey cast iron ?

Related Mcqs:

1. Addition of silicon to cast iron ___________________?

   A. Promotes graphite module formation
   B. Improves its ductility
   C. Does not promote graphite flakes formation
   D. Increases the fluidity of molten metal

2. The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by_________________?

   A. (∂E/∂ni)S, v, nj
   B. (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj
   C. (∂H/∂ni)S, P, nj
   D. All (A), B. and (C)

3. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?

   A. Isobaric
   B. Isothermal
   C. Adiabatic
   D. None of these

4. The temperature at which the magnetic property of iron disappears (i.e., it becomes nonmagnetic) and its electrical conductivity & specific heat also changes, is called the ‘Curie point’, which is ________________ °C ?

   A. 768
   B. 908
   C. 1400
   D. 1539

5. If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the____________________?

   A. Process must be isobaric
   B. Temperature must decrease
   C. Process must be adiabatic
   D. Both B. and C.

6. Annealing of cast iron__________________?

   A. Softens it to facilitate machining
   B. Decreases the free carbon
   C. Increases the strength
   D. None of these

7. A solution which resists change in its pH value on addition of acid/alkali is called the ____________________ solution?

   A. Neutral
   B. Ideal
   C. Buffer
   D. Zero pH

8. In case of the decomposition of hydroiodic acid (2HI ⇌ H2 + I2), addition of H2 (at equilibrium condition) will__________________?

   A. Increase the partial pressure of I2
   B. Decrease the partial pressure of HI
   C. Diminish the degree of dissociation of HI
   D. None of these

9. In the reaction, H2 +I2 ⇌ 2HI, addition of an inert gas will___________________?

   A. Increase the partial pressure of H2
   B. Increase the partial pressure of I2
   C. Increase the total pressure and hence shift the equilibrium towards the right
   D. Not affect the equilibrium conditions

10. Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?

    A. Freezing point elevation
    B. Boiling point depression
    C. Vapor pressure lowering
    D. All A., B. & C.