⦁For the power system shown in Figure 1 with input data given in Table I, draw the per-phase per unit equivalent circuit. Assume a three-phase 100 MVA per unit base. Determine the bus admittance matrix (Ybus). When Bus 1 is slack bus and bus 2 a voltage-controlled bus, find the unknown the presentation of vector x, known vector y, the initial Jacobian matrix in Newton-Raphson method and the J1 and J4 matrix for fast decoupled method of power flow analysis. Table IBus-to-BusR per unitX per unitB per unit1-2 0.02 0.06 0.061-3 0.08 0.24 0.052-3 0.06 0.18 0.042-4 0.08 0.24 0.052-5 0.02 0.06 0.023-40.010.040.014-50.030.100.04

On a average work day more than work place firs are reorted

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?