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a balanced delta-connected load has a per-phase impedance of 45 60deg omega it is connected to a three-phase 208-v
a balanced three-phase wye-connected 2400- v 60-hz source supplies two balanced wye connected loads in parallel the
a three-phase load connected to a 440-v bus draws 120 kw at a power factor of 085 lagging in parallel with this load is
a 230-v single-phase 60-hz source supplies two loads in parallel one draws 10 kva at a lagging power factor of 080 and
the flux in a magnetic core is alternating sinusoidally at a frequency of 500 hz the maximum flux density is 1 t the
the total core loss for a specimen of magnetic sheet steel is found to be 1800 w at 60 hz when the supply frequency is
ac measurements with constant voltage amplitude reveal that the total core loss of a certain magnetic circuit is 10 w
consider the magnetic circuit shown in figure p1127 assume the relative permeability of the magnetic material to be
a toroid with a circular cross section is shown in figure p1123 it is made from cast steel with a relative permeability
a sample of iron having a volume of 20 cm3 is subjected to a magnetizing force varying sinusoidally at a frequency of
in plotting a hysteresis loop the following scales are used 1 cm 400 atm and 1 cm 03 t the area of the loop for a
a three-phase 60-hz transmission line has a total series impedance of 2286 623deg omega per phase it delivers 25 mw at
a 60-hz three-phase transmission line has a total per-phase series impedance of 35j140 omega if it delivers 40 mw at
a single-phase 3-kva 220110-v 60-hz transformer has a high-voltage winding resistance of 03 omega a low-voltage winding
two single-phase transformers each rated 2400 120-v are to be interconnected fora 4800240- v operation andb 2400120-v
a three-phase transformer bank consisting of three 10-kva 2300230-v 60-hz single-phase transformers connected in y- is
a single-line diagram of a three-phase transformer bank connected to a load is given in figure p1154 find the
three single-phase 100-kva 2400240-v 60-hz transformers each of which has an equivalent series impedance of 0045j016
three single-phase 10-kva 2400120-v 60- hz transformers are connected to form a three phase 4160208-v transformer bank
a three-phase 600-kva 2300230-v y-y transformer bank has an iron loss of 4400 w and a full load copper loss of 7600 w
a single-phase 10-kva 2300230-v 60-hz two-winding distribution transformer is connected as an autotransformer to step
a two-winding single-phase transformer rated 3 kva 220110 v 60 hz is connected as an autotransformer to transform a
a two-winding 15-kva 2300115-v 60-hz single-phase transformer which is known to have a core loss of 75 w and a copper
a single-phase two-winding 10-kva 440110- v 60-hz transformer is to be connected as an autotransformer to supply a load
a 15-kva 2200220-v two-winding single phase transformer is connected as an auto trans-former to step up voltage from