In a composite slab, the temperature at the interface (T_inter) between two materials is equal to the average of the temperatures at the two ends. Assuming steady one-dimensional heat conduction, which of the following statements is true about the respective thermal conductivities?

With an increase in the thickness of insulation around a circular pipe, heat loss to surroundings due to

Consider the following data for an item.
Annual demand: $$2500$$ units per year Ordering cost: Rs.100 per order Inventory holding rate: $$25\% $$ of unit price. The optimum order quantity (in units) is:

Price quoted by a supplier

The optimum order quantity (in units) is

Consider a $$PERT$$ network for a project involving six tasks ($$a$$ to $$f$$)

The standard deviation of the critical path of the project is