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Ece 342-Transmission Lines Question Paper

Ece 342-Transmission Lines

Course:Bachelor Of Electrical And Electronic Engineering

Institution: Moi University question papers

Exam Year:2012

ECE 342-TRANSMISSION LINES
CAT I
25TH APRIL 2012

1. Explain the following terms used to describe transmission lines
i. Lossless
ii. Lossy
iii. Uniform
iv. Distortionless
v. Reflection coefficient
vi. Standing wave ratio (6mks)

2. A coaxial cable has the following distributed parameters per loop per kilometre at a frequency of 4 MHz. R= 110 Ohms, L=0.255mH, C=0.07 microFarads and G=0.003S. Calculate its:
i. Attenuation constant
ii. Phase constant
iii. Characteristic impedance

The cable is to be used with the intermediate repeaters in a telephone system. If the attenuation at 4MHz is not to exceed 50dB, calculate the maximum repeater spacing. (10mks)

3. A 50 ohm slotted line with a standing wave detector is used to measure the impedance of a load which is connected to the slotted kind by an unknown length of 50 ohm loss free coaxial cable. With the load in position, the VSWR was measured to be 2.2 and the adjacent voltage minima occurs at the detector scale reading of 24.73 cm and 87.23 cm (scale readings increase in the direction of the load). When the load was replaced by a short circuit, the voltage minima moved to 9.1 cm and 71.6 cm. Use the smith chart to determine the load impedance (8mks)

4. A transmission line of characteristic impedance 50 ohm is used to connect a load of admittance Y(L)=0.036+j0.030S. Design a double stub tuner to match this loaf to the line when the frequency is 500 MHz (The stubs are open circuited and placed three eight wavelengths apart) (8mks)

5. Determine the expression for the capacitance per unit length and inductance per unit length for a coaxial kind of internal and external radii a and b respectively. (8mks)

Ece 342-Transmission Lines Question Paper

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