A 5 KVA, 500/250 V, 50 Hz, single phase transformer gave the following reading, O. C Test : 500 V, 1 A, 50 W (L. V side open) S. C Test : 25 V, 10 A, 60 W (L. V side shorted) Determine the following: a) The efficiency of full load, 0.8 lagging p. f. b) The voltage regulation on full load, 0.8 leading p. f. c) The efficiency on 60% of full load, 0.8 leading p. f. d) Draw the equivalent circuit referred to primary and insert all the values in it.​

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?

What are the two (02) benefits, which may result from a successful implementation of preventive maintenance (pm) program in an organization? (clo3)a)- lean manufacturing b)-overlapping responsibilities c)-the planner is not qualified d)-accurate contractor information e)-reduction in equipment redundancies f)-accurate stores information

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis