Q-4 In the filtration of a sludge, the initial period is effected at a constant rate with the feed pump at full capacity, until the pressure differences reaches 400 kN/m². The pressure is then maintained at this value for a remainder of the filtration. The constant rate operation requires 900 s and one-third of the total filtrate is obtained during this period. Neglecting the resistance of the filter medium, determine (a) the total filtration time and (b) the filtration cycle with the existing pump for a maximum daily capacity, if the time for removing the cake and reassembling the press is 1200 s. The cake is not washed.

00-gauge copper wire has a diameter of 9.266 mm. Calculate the power loss in a kilometer of such wire when it carries 1.00×102 A .

A coil of 350 turns is wound uniformly on an annealed steel core with a mean circumference of 0.15 m and a cross sectional area of 1.5x104 m2. The resistance of the coil is 15 Q and the voltage developed across the coil is 12 V. The relative permeability of an annealed steel is 850 and the permeability of free space is given as 4TT x 10-7 H/m. Calculate the following: Permeability of the medium; (ii) Magnetizing force; (ii) Reluctance of the coil.

A graphite lead (diameter of 0.5mm, length of 5cm) reaches a temperature of 3077K when a voltage difference of 30.7 V is applied across its ends. Find the current (in A) through the lead.