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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
one cycle of a periodic voltage waveform is depicted in fig 1161 find the effective value of the
consider the power system shown in fig 1180 calculatea the total complex powerb the power factorc the capacitance
the circuit of fig 1184 portrays a wattmeter connected into an ac networka find the load currentb calculate the
the kilowatthour-meter of a home is read once a month for a particular month the previous and present readings are as
a consumer has an annual consumption of 1200 mwh with a maximum demand of 24 mvathe maximum demand charge is 30 per kva
in a tv transmitter a series circuit has an impedance of 3 komega and a total current of 50 ma if the voltage across
a certain electronic circuit is connected to a 110-v ac line the root-mean-square value of the current drawn is 2 a
an industrial heater has a nameplate which reads 210 v 60 hz 12 kva 078 pf lagging determinea the apparent and the
a 2000-kw turbine-generator of 085 power factor operates at the rated load an additional load of 300 kw at 08 power
the nameplate of an electric motor has the following informationline voltage 220 v rmsline current 15 a rmsline
as shown in fig 1185 a 550-v feeder line supplies an industrial plant consisting of a motor drawing 60 kw at 075 pf
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