Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250- 525°C, thereby changing austenite to___________________?

Related Mcqs:

1. _____________________ of austenite decreases the hardenability in steel ?

   A. Fine grains
   B. Coarse grains
   C. Homogeneity
   D. Dissolved elements (except cobalt)

2. Austempering process results in the formation of ________________ structure ?

   A. Martensitic
   B. Bainitic
   C. Carburised
   D. Stressed

3. _____________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C ?

   A. Veneering
   B. Galvanising
   C. Electroplating
   D. Calorising

4. Regeneration of molecular sieve requires it to be heated to a temperature of about __________________ °C?

   A. 80-120
   B. 200-300
   C. 600-800
   D. 1000-1100

5. Evaporative cooling process employs a combination of cooling and humidification in which the____________________?

   A. Sensible heat is added
   B. Sensible heat is removed and the latent heat is added
   C. Latent heat is removed
   D. Sensible heat is added and latent heat is removed

6. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the ______________ temperature of air?

   A. Wet bulb
   B. Dry bulb
   C. Saturation
   D. Dew point

7. Hardening of steel is not possible, unless it is heated _________________ critical point ?

   A. Above the highest
   B. Above the lowest
   C. Between the first & second
   D. Between the second & third

8. Square steel key is normally strong in failure by shear & crushing. Keys are normally made of _______________ steel bars?

   A. Hot rolled mild
   B. Cold rolled mild
   C. Forged
   D. Machinable stainless

9. Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal_________________?

   A. Tensile strength
   B. Compressive strength
   C. Young’s modulus
   D. Thermal co-efficient of expansion

10. The ‘transition temperature’ for ductile to brittle behavior of steel increases with increase in the _____________ content in steel?

    A. Carbon
    B. Manganese
    C. Both A nor B
    D. Neither A nor B