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q a single-phase 10-kva 2300230-v 60-hz two-winding distribution transformer is connected as an auto transformer to step up the voltage from 2300 v
q three identical single-phase transformers are to be connected to form a three-phase bank rated at 300 mva 230345 kv for the following
q a three-phase 600-kva 2300230-vy-y trans-former bank has an iron loss of 4400wand a full-load copper loss of 7600 w find the efficiency of the
q three single-phase 10-kva 2400120-v 60- hz transformers are connected to form a three- phase 4160208-v transformer bank each of the single-phase
q three single-phase 100-kva 2400240-v 60-hz transformers each ofwhich has an equivalent series impedance of 0045j016 referred to its low-voltage
q a three-phase transformer bank consisting of three 10-kva 2300230-v 60-hz single-phase transformers connected in y- is used to step down the
q a 5-mva 66132 kv three-phase transformer supplies a three-phase resistive load of 4500 kw at 132 kv what is the load resistance in ohms as measured
q two 1150115-v transformers are to be inter connected for a 2300230-v operation and b 1150230-v operation show the interconnections and appropriate
q two single-phase transformers each rated 2400 120-v are to be interconnected for a 4800240- v operation and b 2400120-v operation draw circuit
q show polarity markings for a single-phase transformer for a subtractive polarity and b additive
q a 10-kva transformer is known to have an iron loss of 150 w and a full-load copper loss of 250 w if the transformer has the following load cycle
q a 75-kva transformer has an iron loss of 1 kw and a full-load copper loss of 1 kw if the transformer operates on the following load cycle determine
q a single-phase 3-kva 220110-v 60-hz transformer has a high-voltage winding resistance of 03 a low-voltage winding resistance of 006 a leakage
q a transformer has its maximum efficiency of 09800 when it delivers 15 kva at unity power factor during the day it is loaded as follows12 hours 2 kw
q the efficiency of a 400-kva single-phase 60-hz transformer is 9877 when delivering full-load current at 08 power factor and 9913with half rated
q the following data were obtained on a 25- kva 2400240-v 60-hz single-phase distribution transformerbull open-circuit test with meters on lv side
q a 25-kva 2200220-v 60-hz single-phase transformer has an equivalent series impedance of 35 j40 referred to the primary high-voltage sidea
q a 25-kva 2400240-v 60-hz single-phase transformer has an equivalent series impedance of 345 j575 referred to the primary high voltage side the
q a 10-kva 200400-v single-phase transformer gave these test resultsbull open-circuit test lvwinding supplied 200v 32 a 450 wbull short-circuit test
q a 300-kva transformer has a core loss of 15 kw and a full-load copper loss of 45 kwa calculate its efficiency corresponding to 25 50 75 100 and 125
q a 75-kva 230115-v 60-hz transformer was tested with these resultsbull open-circuit test 115 v 163 a 750 wbull short-circuit test 95 v 326 a 1200
a 3-kva 220110-v 60-hz single-phase transformer yields these test databull open-circuit test 200 v 14 a 50 wbull short-circuit test 45 v 1364 a 30
q these data were obtained from tests carried out on a 10-kva 2300230-v 60-hz distribution transformerbull open-circuit test with low-voltage winding
q a 20-kva 2200220-v 60-hz single-phase transformer has these parametersresistance of the 2200-v winding r1 250 resistance of the 220-v winding r2
q a 150-kva 2400240-v 60-hz single-phase transformer has the following parameters r1 02 r2 0002 x1 045 x2 00045 rc 10 k and xm 155 k where