Abalanced y -connected load having an impedance of 92+j21ω/ϕ is connected in parallel with a balanced δ -connected load having an impedance of 150∠ 0 ∘ ω/ϕ . the paralleled loads are fed from a line having an impedance of j1ω/ϕ . the magnitude of the line-to-line voltage of the δ -load is 8150 v .

a. calculate the magnitude of the current in the line feeding the loads.
b. calculate the magnitude of the phase current in the y- connected load.
c. calculate the magnitude of the phase current in the delta-connected load.
d. calculate the magnitude of the line voltage at the sending end of the line.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86

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?