Eutectic reaction for iron-carbon system occurs at a temperature of _______________ °C ?

Related Mcqs:

1. If a solution of eutectic composition is cooled, _______________ reaching the eutectic temperature ?

   A. The solvent begins to freeze out even before
   B. It will undergo no change until
   C. It will not solidify even on
   D. None of these

2. The temperature at the eutectic point of the system is the _____________ temperature that can be attained in the system?

   A. Lowest
   B. Highest
   C. Average
   D. None of these

3. In an eutectic system, two elements are completely____________________?

   A. Soluble in solid state
   B. Insoluble in liquid state
   C. Insoluble in both solid & liquid state
   D. Soluble in liquid state

4. If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will___________________?

   A. Increase
   B. Decrease
   C. Remain unaltered
   D. Increase or decrease; depends on the particular reaction

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

   A. Manganese
   B. Phosphorous
   C. Magnesium
   D. Chromium

6. The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ΔH = – 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = – 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?

   A. -109.5
   B. +109.5
   C. +180
   D. +100

7. The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is _____________ kg mole?

   A. 1
   B. 0
   C. 16
   D. 44

8. For most salts, the solubility increases with rise in temperature, but the solubility of _______________ is nearly independent of temperature rise?

   A. Sodium chloride
   B. Sodium carbonate monohydrate
   C. Anhydrous sodium sulphate
   D. Hypo

9. The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at ______________ percent relative humidity ?

   A. 0
   B. 100
   C. 50
   D. None of these

10. Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?

    A. A homogeneous solution (say of phenol water) is formed
    B. Mutual solubility of the two liquids shows a decreasing trend
    C. Two liquids are completely separated into two layers
    D. None of these