The optimum pouring time for a casting depends on several factors. One important factor among them is

Ceramic slurry is used in making the molds for

Low permeability molds and low pouring temperature of the molten metal causes ......................... defect in castings.

Pressure die casting deals with casting metals of relatively ............. A ............. melting point and provides ........ B.......... production rate.

A. higher / lower,$$\,\,\,\,\,\,\,\,\,\,$$ B. higher / lower