136) For a closed system, the difference between the heat added to the system and work done by the system is equal to the change in
Internal energy
Related OFB Chargeman Mechanical Question Paper - 2014 with Answer Key
All of these
During cold working process
* Grain structure is distorted
* Strength and hardness of metal increases
* Surface finish is improved
Resilience
Resilience:
Resilience is the ability of a metal to absorb energy and resist soft and impact load.
Toughness:
When a huge external force is applied on a metal, the metal will experience fracture. Toughness is the ability of a metal to resist fracture. The ability of a material to resist fracture due to high impact loads, is called toughness.
Stiffness:
When an external force is applied on a metal, it develops an internal resistance. The internal resistance developed per unit area is called stress. Stiffness is the ability of a metal to resist deformation under stress.
Hardness:
Hardness is the ability of a metal to resist permanent change of shape caused by an external force.