Choice affected by Nature of load: The percentage or fraction of the ultimate strength adopted by the designer in any given case depends on the material used and the manner in which the load acts.
Answer the following by naming the Class of the load.
(a) This load includes loads carried by a beam spanning an opening in a brick wall, in which case the steady weight of the overlying brickwork induces a constant stress in the beam.
(b) This class covers loads on bridges and the moving parts of machinery. This class of load may be further divided into varying load and alternating load.

(c) These are loads imposed on railway bridges, cranes, hoists and certain parts of shearing and punching machines.