EXCEL REVIEW REVI EW CENTER CENT ER 1. When When a voltag voltage e is is first first appli applied ed to a series LR circuit, how much opposition does the inductance have to the flow of current compared to that of circuit resistance? A. small B. negl neglig igib ible le C. large . ver! ver! larg large e ". #n RL RL circ circuit uit,, the the time time cons constan tantt is the time re$uired for the induced current to reach what percentage of its full value? %. Assu Assumi ming ng tha thatt i&'( i&'( ) 1' 1' A, A, calculate i&t( and i*&t( in the circuit in +ig.
TransReso rans Reso 6. What What is is the the time time cons consta tant nt of of a circuit having a 1''7microfarad capacitor and a '73ilohm resistor in series? 1'. A voltag voltage e of 1' 5 is applied applied at t ) ' to a series RLC circuit with R ) / ohms, L ) '.1 2, C ) /'' µ+. +ind the transient voltage across the resistance. A. %.0e7"/tcos1%6t B. 0.%e7"/tsin1%6t C. %.0e7"/tsin1%6t . 0.%e7"/tcos1%6t 11. 11. +ind the the 8 of a circuit circuit when when the resonant fre$uenc! is 1.1"492:, the inductance is .microhenr!s and the resistance is 14,''' ohms in parallel. 1". What is is the resonant resonant fre$uenc fre$uenc! ! of a circuit when L is % microhenr!s and C is ' picofarad are in parallel?
. -he switch switch in the the cir circui cuitt of +ig. +ig. has been closed for a long time. At t ) ', the the switch is opened. Calculate i&t( for t '.
1%. What is is the resonant resonant fre$uenc fre$uenc! ! of a circuit when L is 1/ microhenr!s and C is / picofarad are in series? 1. What is is the resonant resonant fre$uenc fre$uenc! ! of a circuit when L is / microhenr! and C is 6 picofarads are in series?
/. #n the the cir circui cuitt shown shown in +ig. +ig.,, find find io , vo , and i for all time, assuming that the switch was open for a long time.
1/. +ind the the half7power half7power bandwidt bandwidth h of a parallel resonant circuit which has a resonant fre$uenc! of .1 92: and 8 of 1/'. 10. -wo -wo ;eries ;eries connected connected 2 inductors are ad
0. After After two two time time consta constants nts,, the the capacitor in an RC circuit is charged to what percentage of the suppl! voltage? . 2ow 2ow lon long g does does itit ta3 ta3e e for for an initial charge of 4'' 5 C to decrease to %6.6 5 C in a /'7 microfarad capacitor when a 17 megohm resistor is connected across it? 4. After After two two time time consta constants nts,, the the capacitor in an RC circuit is discharged to what percentage of the starting voltage?
14. What is is the time time constant constant of a /''m2 coil and a %,%'' ohm resistor in series? 16. etermine etermine the the cut7off cut7off fre$uenc! fre$uenc! of a first order low7pass filter for R1)1." 3ohms and C1)'.'"microfarad. "'. A pulse pulse wave wave is ac coupled coupled to an oscilloscope having R1)"'9ohms and Cc)'./microfarad. etermine the longest pulse with &or space width( that can be displa!ed
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with noticeable low7fre$uenc! distortion being introduced b! the oscilloscope. "1. #f two capacit capacitors ors are connecte connected d in series, and their values are /' picofarad and %' picofarad, what is the total capacitance "". -he resonant resonant circu circuit it of a tuned tuned collector transistor oscillator has a resonant fre$uenc! of /92:. #f the value of the capacitance is increased b! /'=, calculate the new resonant fre$uenc!. "%. #f !ou need need an LC circuit circuit to to be resonant at "/'' 2: and used a 1/' m2 coil, what should the capacitance value be? ". -he tuned tuned circui circuitt of a superheterod!ne receiver has a %'' microhenr!s inductance and a resistance of 1/ ohms. Compute for the capacitance to be connected in series with the coil so that the circuit is series resonant at 4' 32:. "/. #f the the fre$uenc! fre$uenc! in in an RLC circuit is below resonant fre$uenc!, then >>>>>>>>>>>. A. L C C B. C ) L C. C L L . L ) R "0. +ind the half7pow half7power er bandwidth bandwidth of a resonant circuit which has a resonant fre$uenc! of 1.4 92: and a 8 of 6/. ". An LC resonat resonates es at "''' "''' 32:, and has a 8 of 1''. +ind the lower and upper cutoff fre$uencies. "4. A parallel parallel resonant resonant circui circuitt magnifies which of the following? A. #mpedance B. 5oltage C. Current . 5oltage and Current Current "6. A parallel parallel circuit circuit with resistance resistance onl! in the inductive branch has the following constants@ L)1/6 µ2, C)1/6 p+, R s)/ Ω. What is the resonant fre$uenc!? etermine the 8 of the pa rallel circuit at antiresonance. %'. A loaded loaded paralle parallell resonant resonant circuit which is tuned to 0 92: has a total impedance of 1',''' ohms and an overall 8 factor of 1/. Calculate the coil resistance.
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