Cold cracking in the heat affected zone of a high strength steel weld can take place because of the___________________?

Related Mcqs:

1. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?

   A. 5
   B. 10
   C. 20
   D. 35

2. With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and _____________ is not affected ?

   A. Impact strength
   B. Percent elongation
   C. Hardness
   D. Both B & C

3. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?

   A. Cobalt, chromium & tungsten
   B. Cobalt, chromium & nickel
   C. Molybdenum, tungsten & chromium
   D. Cobalt, zirconium & molybdenum

4. A reduction in thermal resistance during heat transfer does not occur in the___________________?

   A. Convection heat transfer by stirring the fluid and cleaning the heating surface
   B. Conduction heat transfer by reduction in the material thickness and increase in the thermal
   conductivity
   C. Radiation heat transfer by increasing the temperature and reducing the emissivity
   D. None of these

5. Suitability of steel for its use in cable is judged by its strength in__________________?

   A. Tension
   B. Compression
   C. Torsion
   D. Shear

6. Ultimate strength in tension as compared to that in shear for steel is____________________?

   A. Half
   B. One third
   C. One and half times
   D. One fourth

7. Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of ?

   A. Grashoff number
   B. Grashoff number & Reynolds number
   C. Reynolds number
   D. Grashoff number & Prandtl number

8. A form of stress corrosion failure termed as ‘season cracking’ is generally observed in __________________?

   A. Thermosetting polymers
   B. High carbon steels
   C. Brasses
   D. Borosilicate glasses

9. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is ______________ °C?

   A. 20
   B. 60
   C. 120
   D. ∞

10. Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type________________?

    A. Parallel flow with equal heat capacities
    B. Counter flow with equal heat capacities
    C. Counter flow with unequal heat capacities
    D. Parallel flow with unequal heat capacities