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ECE Objective Questions { Transmission Lines and Waveguides }



1. The relationship between inductance and capacitance per unit length and characteristic impedance of a transmission line is
A. Zo = 1/17.6
B. Zo = "DT
C. Zo = .167j,
D. Zo = 2n147

2. The characteristic impedance of a twin-lead cable commonly used for TV lead-in is nearly
A. 1 ki2
B. 100 LI
C. 10 L2
D.300

3. If a transmission line is terminated with a resistance equalto its characteristic impedance
A. the line loss will be maximum
B. the input impedance will be twice the terminating resistance
C. the standing wave ratio will be minimum
D.

4. Transmission of power to a load over a transmission line achieves optimum value when standing-wave ratio (SWR) becomes
A. 2 : 1
B. 1 : 2
C. 1: 1
D. 2 : 2

5. A Smith chart is used for solving
A. propagation problems
B. transmission line problems
C. antenna problems
D. sag problems

6. The value ofSWR for a transmission line of characteristic impedance Zo when feeding a load of impedance ZL is
A. SWR = Zo ? ZL
B. SWR = Zo / ZL
C. SWR = Zo + ZL
D. SWR = ZL / Zo

7. A transmission line having Zo = 75 ohm is delivering power to a 300 1 load. Its SWR is
A. 1 : 4
B. 4 : 1
C. 1 : 2
D. 2 : 1

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