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q let a square-wave voltage source having an amplitude of 5v a frequency of 1 khz a pulse width of 05 ms and an internal source resistance of 50 be
q the response yt of a linear system to an excitationxt e-2t ut is yt t 2e-t utfind the transfer
q the unit impulse response ht of a linear system is ht 5e-t cos2t - 30deg determine
q the response yt of a linear system to a unit-step excitation is yt 4 - 10e-t 8e-2t uta find the system functionb find the frequency at which the
q the response vt of a linear system to a unit-step excitation it is given by vt 5 - 3e-t 2e-2t ut determine the transfer function hs v si
q determine the laplace transform for each of the following functions from the basic denition of equationa f1t utb f2t e-atc f3t df t dt assuming
q a let a unit impulse of voltage vt deltat be applied to a series combination of r 20 and l 10 mh determine the current itin the series circuitb
a let a unit impulse of current it deltat be applied to a parallel combination of r 3 and c 12 f determine the voltage vct across the capacitorb
q the voltage wave form of figure is applied to an rlc series circuit with r 2 l 2h and c 1 f obtain it in the series circuit note that the
q three loads in parallel are supplied by a single phase 400-v 60-hz supplyload a 10 kva at 08 leading power factorload b 15 kw at 06 lagging power
q a 66-kv line feeds two loads connected in parallel load a draws 100 kw at 06 lagging power factor and load b absorbs 100 kva at 08 lagging power
q at the two terminals a b of a one-port network the voltage and the current are given to be vt 200 radic2 cos 377t 60deg v and it 10radic2 cos377t
q the voltage across a parallel combination of a 100- resistor and a 01-microf capacitor is 10 cos5000t 30deg v determine the admittance of the
q an rl series circuit carries a current of 002 cos 5000t a for r 100 and l 20 mh find the impedance of the series combination and determine the
q in a glc parallel circuit excited by a current source it for g 05s l 3h and c 05 f determine it if the inductor current ilt
q in an rlc series circuit excited by a voltage source vt for r 10 l 1 h and c 01f determine vt if the capacitor voltage vct 5e-10t
q consider an rc parallel circuit excited by a it 20e-2t a and b it 20 a find the forced component of the current through the capacitor for r 2
q consider an rl series circuit excited by a vt 20e-2t v and b vt 20 v determine the forced component of the voltage across the inductor for r 2
qa the concept of duality can be extended to nonelectric physical systems bymeans of analogs for example the mechanical system characteristics can be
q a person while driving a car in a cyclone and waiting at an intersection hears a thumping sound when a power line falls across the car and makes
q consider a 240-v supply feeding a resistive load of 10 kw through wires having a total resistance of r 002 for the same load let a 120-v supply
q referring to figure let vbn vrn 120 v rms magnitude and vbr 240 v rms magnitude write down expressions for vbnt vrnt and vbrt and sketch them as
q two wattmeters are used as shown in figure to measure the power absorbed by a balanced delta-connected load determine the total power in kw the
q the two-wattmeter method for measuring three-phase power is applied on a balanced wye-connected load and the readings are given by wc 836w and wa
q when the two-wattmeter method for measuring three-phase power is used on a certain balanced load readings of 1200w and 400w are obtained without