1
GATE ECE 2014 Set 3
MCQ (Single Correct Answer)
+1
-0.3
In the following figure, the transmitter Tx sends a wideband modulated RF signal via a coaxial cable to the receiver Rx. The output impedance $${Z_T}$$ of Tx, the characteristic impedance $${Z_0}$$ of the cable and the input impedance $${Z_R}$$ of Rx are all real. Which one of the following statements is TRUE about the distortion of the received signal due to impedance mismatch?
A
The signal gets distorted if $${Z_R}\, \ne \,{Z_0}$$ , irrespective of the value of $${Z_T}$$
B
The signal gets distorted if $${Z_T}\, \ne \,{Z_0}$$, irrespective of the value of $${Z_R}$$
C
Signal distortion implies impedance mismatch at both ends: $${Z_T}\, \ne \,{Z_0}$$ and $${Z_R}\, \ne \,{Z_0}$$
D
Impedance mismatches do NOT result in signal distortion but reduce power transfer efficiency
2
GATE ECE 2014 Set 2
Numerical
+1
-0
To maximize power transfer, a lossless transmission line is to be matched to a resistive load impedance via a $$\lambda /4$$ transformer as shown.
3
GATE ECE 2013
MCQ (Single Correct Answer)
+1
-0.3
The return loss of a device is found to be 20 dB. The voltage standing wave ratio (VSWR) and magnitude of reflection coefficient are respectively.
A
1.22 and 0.1
B
0.81 and 0.1
C
- 1.22 and 0.1
D
2.44 and 0.2
4
GATE ECE 2012
MCQ (Single Correct Answer)
+1
-0.3
A coaxial cable with an inner diameter of 1 mm and outer diameter of 2.4 mm is filled with a dielectric of relative permittivity 10.89. Given $${\mu _0} = \,4\,\pi \, \times \,{10^{ - 7}}$$
$$H/m,\,\,{\varepsilon _0} = {{{{10}^{ - 9}}\,} \over {36\,\pi }}\,F/m,$$ the characteristic impedance of the cable is
A
330 $$\Omega$$
B
100 $$\Omega$$
C
143.3 $$\Omega$$
D
15.9 $$\Omega$$
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