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a factory has the following four major loadsbull a motor rated at 5 hp 08 pf lagging 1 hp 07457 kwbull a heater rated
a 1-mva substation operates at full load at 07 power factor it is desired to improve the power factor to 095 by
a coupling capacitor is used to block dc current from an amplifier as shown in fig 1186a the amplifier and the
a power amplifier has an output impedance of 40 j8 omega it produces a no-load output voltage of 146 v at 300 hza
calculate the line current required for a 30-kw three-phase motor having a power factor of 085 lagging if it is
find the line currents in the unbalanced three-phase circuit of fig 1226 and the real power absorbed by the
find i1 and i2 in the circuit of fig 1384 calculate the power absorbed by the 4-omega
a 4-kva 2300230-v rms transformer has an equivalent impedance ofon the primary side if the transformer is connected to
in the circuit of fig 1390 find the value of the coupling coefficient k that will make the 10-omega resistor dissipate
a 440110-v ideal transformer can be connected to become a 550440-v ideal autotransformer there are four possible
a 25000240-v rms distribution transformer has a primary current rating of 75 aa find the transformer kva ratingb
a step-down power transformer with a turns ratio of n 01 supplies 126 v rms to a resistive load if the primary current
for an fm radio receiver the incoming wave is in the frequency range from 88 to 108 mhz the tuner circuit is a parallel
design a series rlc circuit that will have an impedance of 10 omega at the resonant frequency of omega0 50 rads and a
the two-wattmeter method gives p1 1200 w and p2 -400 w for a three-phase motor running on a 240-v line assume that
for the wye-connected load of fig 1257 the line voltages all have a magnitude of 250 v and are in a positive phase
as shown in fig 1265 a three-phase four-wire line with a phase voltage of 120 v supplies a balanced motor load at 260
refer to the unbalanced circuit of fig 1258 calculatea the line currentsb the real power absorbed by the loadc the
a three-phase four-wire system operating with a 208-v line voltage is shown in fig 1264 the source voltages are
the following three parallel-connected three-phase loads are fed by a balanced three-phase sourceif the line voltage is
a relay coil is connected to a 210-v 50-hz supply if it has a resistance of 30 omega and an inductance of 05 h
assuming that the load impedance is to be purely resistive what load should be connected to terminals a-b of the
a load draws 5 kvar at a power factor of 086 leading from a 220-v rms source calculate the peak current and the
for the following voltage and current phasors calculate the complex power apparent power real power and reactive power
the oscillator circuit in fig 10110 uses an ideal op ampa calculate the minimum value of ro that will cause oscillation