Recrystallization temperature is one________________?

Related Mcqs:

1. At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?

   A. 373°K
   B. 273.16°K
   C. 303°K
   D. 0°K.
   E. 300°K

2. The ability of a material to resist softening at high temperature is known as____________________?

   A. creep
   B. hot tempering
   C. hot hardness
   D. fatigue
   E. superhardening

3. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will _________________?

   A. increase
   B. decrease
   C. remain same
   D. first increase and then decrease
   E. show unpredictable behaviour

4. The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?

   A. 770°C
   B. 910°C
   C. 1050°C
   D. below recrystallisation temperature
   E. above recrystallization temperature

5. Ferromagnetic alpha iron exists in temperature range of________________?

   A. below 723°C
   B. 770 – 910°C
   C. 910-1440°C
   D. 1400-1539°C
   E. above 1539°C

6. Super conduction by metals is observed in the temperature range of_________________?

   A. below 10°K
   B. above 100°K
   C. around 0°C
   D. around 100°C
   E. above 1000°C

7. Delta iron occurs at temperature of_______________?

   A. room temperature
   B. above melting point
   C. between 1400°C and 1539°C
   D. between 910°C and 1400°C
   E. none of the above

8. Recrystallisation temperature can belowered by_________________?

   A. purification of metal
   B. grain refinement
   C. working at lower temperature
   D. all of the above
   E. none of the above

9. Petrol is distilled at a temperature in range of__________________?

   A. 30 – 65°C
   B. 65 – 220°C
   C. 220-350°C
   D. 350-450°C
   E. 450-550°C

10. Heating wet steam at constant temperature is heating it at constant_________________?

    A. volume
    B. pressure
    C. entropy
    D. enthalpy
    E. none of the above