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Slabs of filter cake with a bone-dry density of 1,600 kg/m3 are to be dried from an initial free-moisture content of 110% (dry basis) to a final free-moisture content of 5% (dry basis) batchwisein trays that are 1 m long by 0.5 m wide, with a depth of 3 cm. Drying will take place from thetop surface only. The drying air conditions are 1 atm, 200oF, and a 100oF wet-bulb temperature.The air velocity across the trays is 3.5 m/s. Experiments under these drying conditions show acritical free-moisture content of 70% (dry basis), with a linear falling-rate period from Xc to X*.Determine:
(a) drying time for the constant-rate period;
(b) drying time for the falling-rate period.
Of the three basic types of radioaction-alpha, beta, and gamma-which has the greatest penetration into tissue? Explain the rationale behind your answer.
What mass of propane must be burned to furnish this amount of energy assuming the heat transfer process is 60.% efficient?
The heat capacity of thereactants and products are 1.95 kJ/kg-K, the volumetric flow rate is 0.33 m3/hr, and the feedtemperature is 20oC. If the conversion is 95%, calculate (a) the reactor size and (b) the temperature of the reaction mixture, ift..
Find the rotor copper loss at full load and the speed at maximum torque. Compute the value of the per-phase rotor resistance (referred to the stator) that must be added in series to produce a starting torque equal to the maximum torque.
Consider a series-carry synchronous counter with T flip-flops shown in Figure P6.2.29 in which the AND gates carry forward the transitions of the flip-flops, thereby improving the speed. Sketch the output waveform for the synchronous counter.
The property that the vector on the right-hand side of a differential equation points into the interior of the first orthant is obviously a necessary condition for negative cross-effects to be absent. Give a polynomial example showing that it is n..
Show that the zero of the closed-loop system is the same as the zero of the open-loop system.
What is the melting point at standard conditions for ammonia? Boling point is given -33.4C.
The constant losses from a no-load run as a motor are given to be 220 W, of which 70 W represents friction and wind age losses. Calculate the efficiency of the induction generator.
The force plate in Figure 4.9 is 70 cm by 70 cm square. At a particular instant of the gait cycle each transducer reads F1 ¼ 210 N, F2 ¼ 220 N, F3 ¼ 150 N, and F4 ¼ 180 N. Compute the resultant force and its location.
In the direct steelmaking reactor based on the reduction of an oxidizing foaming slag by char (carbon) particles and droplets of iron containing 2% carbon. Estimate the total surface area of char and iron droplets needed to achieve the smelting ..
Fresh halibut livers containing 25.7 wt % oil are to be extracted with pure ethyl ether to remove 95% of the oil in a countercurrent multistage leaching process. Calculate the amounts and compositions of the exit streams and the total number of the..
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