(20 points) a gas-driven turbine is used to drive a small synchronous generator. the machine is wye-connected, has 4 poles, and is rated at 13.8 kv (line), 10 mva (three-phase) with a synchronous reactance of 18 ohms (negligible armature resistance). a prime mover provides the source of mechanical power that keeps the shaft speed constant at 1800 rpm. the machine is connected to the utility three-phase feeder which keeps the terminal voltage fixed at 13.8 kv, 60 hz (infinite bus). a) suppose that the generator is initially delivering 5 mva at a power factor of 0.8 lagging. calculate: i. the three-phase real and reactive power delivered to the electrical load,

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

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

An electric motor is used to drive a power press which makes steel turning moment diagrams 323 pressings from a metal sheet. the motor runs at a mean speed of 50 rev/s. the torque required is 10.0nm for 0.2s, followed by 1.0nm for0.3 s with this sequence then being repeated. what is the minimum power required of the motor and the moment of incrtia required for the t1ywhcel if the speed fluctuations are to be restricted to 1.5%?