NEW
Font size
WorksheetsMidterm Exam Problem Sovling
Total questions: 10
Worksheet time: 8mins
1. A transmission line has a 2.5pF of a capacitance per foot and 100nH of inductance per foot. Calculate its characteristic impedance.
Answer choices
5x10^-3 ohms
200 ohms
377 ohms
23 ohms
2. If a cable has a velocity factor of 0.8, what length of a cable is required for a 90 degrees phase shift at 100 MHz?
1.0m
3.2m
0.6m
0.75m
A cable has a VSWR of 10. If the minimum voltage along the cable is 20 volts, what is the maximum voltage along the cable?
0.2
1.3
0.35
2.5
4. A generator sends a 250 W of power down a line. If the SWR of the line is 2.5, determine the power absorbed by the load.
123 watts
65.02 watts
203.8 watts
253 watts
5. A 75-ohm characteristic impedance transmission line is terminated in by a load impedance of 120 ohms. Determine the input impedance looking into the line 1 meter long, if the line has a velocity factor of 0.9 and operates at a frequency of 50MHz.
50+j65.3 ohms
25-j21 ohms
51.83-j18.37 ohms
75+j32 ohms
6. What is the loss of the circuit in dB if the power ratio of output is 0.01?
-6dB
-20dB
10dB
-10dB
7.A microstrip line is formed using 0.095-inch-thick PC board (dielectric constant = 1.8), with a bottom ground plane and a single 0.15 inch wide, 0.008-inch-thick track on the top. What is its characteristic impedance?
26.7 ohms
72.37 ohms
86.8 ohms
95.3 ohms
8. The TE10 mode air dielectric waveguide has an inside cross section of 2cm by 4cm. Find the characteristic impedance of the waveguide of the operating frequency is at 5GHz.
430 ohms
570 ohms
304 ohms
255 ohms
9. A rectangular waveguide has an inner cross section of 8 by 16mm. Find the group velocity at a frequency of 15GHz.
198x10^6 m/s
297.65x10^6 m/s
186x10^6 m/s
290x10^6 m/s
10. The voltage standing wave caused by a mismatched load has a maximum value of 50V and a minimum value of 30V. What is the VSWR in dB?
6.3dB
4.44dB
5dB
9.8dB
