The time for 50% consolidation of a 25 mm thick clay layer (drained at top and bottom) in the laboratory is 225 sec. How long (in days) will it take for a 2 m thick layer of the same clay in the field (under the same pressure increment) to reach 50% consolidation? There is a rock layer at the bottom of the clay in the field.

Machinery that is a key part of the process and without which the plant or process cannot function is classifed as: (clo4) a)-critical machinery b)-essential machinery c)-general purpose machinery d)-none of the specified options.

Brief discuss how the presence of dislocations in crystal structures can be an advantage and a disadvantage to engineer and designers.

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.