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The falling-rate portion of the drying time for a particle of skim milk begins at a critical moisture content of 25%, and the final moisture content is 4%. The air used for drying is 120 °C was heated from ambient air of 20 °C and 40% RH. The particle size at the critical moisture content is 20 micron, and the specific heat of the product solids is 2.0 kJ/kg °C. The mass diffusivity for water vapor within the product is 3.7´10-12 m2/s, and the density of the product particle is 1150 kg/m3.

a.   If the equilibrium moisture content for the product is 3.5%, estimate the time for the falling-rate portion of the drying

b.   If 5000 m3/min of heated air are needed for product drying, determine the thermal energy needed to heat the air to 120 °C.

 

7, The lengths of crank and connecting rod of a horizontal


reciprocating engine are 100 mm and 500 mm respectively. The


crank is rotating at 400 rpm. When the crank has turned 300 from


inner dead center, find analytically, (i) the velocity and


acceleration


of the slider, (ii) the angular velocity, and angular acceleration of


theconnecting rod.

A field is in the form of a regular pentagon. The direction of the bounding sides was surveyed with the assumed meridian 6° to the right of the true north and south meridian., the bearing of one side AB is N 40°57’ W. Compute the bearing of CD


a piston-cylinder device 0.5 kg of carbon dioxide is compressed from 0.3 to 0.1 m3

. During

the process, the pressure and volume is related by P = aV-2

, where a = 8 kPa.m6

. Calculate work

transfer, change in internal energy and heat transfer during the process. (Take isobaric heat

capacity, cp = 0.847 kJ/kgK).


Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. Sketch the region, the solid, and a typical disk or washer.


The height above the ground of a child on a swing varies from 50 cm at the lowest point to 200 cm at the highest point



a. Draw the simple, clear and neat figure using drawing instruments.



b. Establish the equation of the energy conservation of the system.



c. Determine the maximum velocity of the child in cm/s?

To push a 25 kg wooden box up a 30° inclined plane, a man exerts a force of 150 N parallel to the inclined plane. The wooden box slides 5 meters and the coefficient of friction between the wooden box and the inclined plane is 0.25;


a. Draw the clear and neat figure of the system.


b. Draw the Force diagram.


c. Establish the convenient axis and reflect the component of the forces along the convenient axis.

1. A uniform 20 ft long and weighing 20lbs is held by Peter 2 ft from the left end while John carries the same bar 5 ft from the right end.


a. Draw the clear and neat figure. Label the figure properly.


b. Draw the force diagram and reflect the distances between the forces.

Explain different addressing modes. What are the advantages of Relative addressing mode over Direct addressing mode?


For this assignment, do a take-off for Structural Work. For this assignment, you may only focus on the Reinforcement ONLY. Exclude the concrete and formwork from the take-off list. Include in your take off list:


1. Reinforcement in slab

2. Reinforcement in pad footing

3. Starter bar in column stump


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