2. For the transmission line below, determine the impedances. (Zo = 50, f = 2 GHz) (a) Input impedance to the right of the junction (ZA) (b) Input impedance to the lower side of the junction (ZB) (c) Zin -0.110A- Zi in ZB ZA 50 Ω 50 Ω 0.095A + 60 Ω 0.995 PF

Calculate using a frequency an octave higher from the cut-off frequency ( or two times as much as the cutoff frequency)

Qualitative AC Circuits R 1. Consider reading the voltage across the capacitor in the drawn circuit'. Here the voltage v. across the capacitor can be taken as the output of EO Frequency w Vout = ve the circuit. Will the output of this circuit be larger for high frequency input or low frequency input? Explain why.

A.) An impedance of R = 100 ohms and L = 20mH is connected across anotherimpedance of R = 150 ohms and C = 250microfarad. Determine at which frequency, this circuit will resonate across a variable AC frequency source of 240V. Determine also the Q factor of the coil used. B.) A certain non - resistive inductor of L = 150mH is connected across a lossless capacitor of C = 450microfarad. If the combination is connected across a 230V variable frequency supply, determine the resonance frequency.

56.25 W use =Ps = 56. 25 W 7. A Carrier of 750 W,1MHZ is amplitude modulated by LSB sinusoidal signal of 2 KHz to a depth of 50%. Calculate Bandwidth, Power in side band and total power transmitted.

The average power absorbed by a resonant circuit is at a minimum at resonance.  True  False

42 Modulation is dune in A. Tramamitter Radio veceiver C. Between transmitter and radio receiver D. None of the above 43. At 100 modulation, the power in each sidehands in AY 50% B. 40% C. 60% D 25% 44 In a TV tranumission, picture is modulated A. Frequency B. Phase CT Amplitade D. None of the above of that of carrier. 45. Given a sine wave modulating signal, PM moduluted wave appears to be frequency modulated by cosine modulating wave. A. True B. False

If the carrier signal is Vs (t) = Ve Sin (Wst). And the information signal is used to generate AM wave Vm (t) = Vm Sin (t), the AM Bandwidth is equal to 10 KHz, modulation index m = 0.6 and the spectrum frequency for AM is shown figure: 4 41 -100-5fm -100 -100+5fm 100-5fm 100 100+5fm KHZ 4-determine the power at carrier of the antenna resistance one ohm (1 2) 5- Write the AM equation with all values.

An average-reading power meter is connected to the input circuit of a transmitter. The transmitter output is fed into a 75-2 resistive load, and the wattmeter reads 67 W. a) what is the power in dBm units? b) what is the power in dBk units? c) what is the power in dBmV units? Assume that a waveform with known RMS value Vms is applied across a 50-2 load. Derive a formula that can be used to compute the dBm value from Vms !!

8.Four impedances composed of Za = 7 – j5 , Zb = 9 + j6 , Zc = 4 – j6 and Zd = 4 –j 5 all connected in parallel supplied by 250V, 60 hz source Find the value of resistor and inductor connected in series which will be connected in parallel with the whole circuit will be resonance at all frequency.