1
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
2
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 $$\Omega $$
3
GATE ECE 2011
MCQ (Single Correct Answer)
+1
-0.3
A transmission line of characteristic impedance 50 $$\Omega $$ is terminated by a 50 $$\Omega $$ load. When excited by a sinusoidal voltage source at 10 GHz, the phase difference between two points spaced 2 mm apart on the line is found to be $$\pi /4$$ radians. The phase velocity of the wave along the line is
A
$$0.8\,\, \times \,\,{10^8}\,m/s$$
B
$$1.2\,\, \times \,\,{10^8}\,m/s$$
C
$$1.6\,\, \times \,\,{10^8}\,m/s$$
D
$$3\,\, \times \,\,{10^8}\,m/s$$
4
GATE ECE 2010
MCQ (Single Correct Answer)
+1
-0.3
A transmission line has a characteristic impedance of 50 $$\Omega $$ and a resistance of 0.1 $$\Omega $$/m. If the line is distortionless, the attenuation constant (in Np/m) is
A
500
B
5
C
0.014
D
0.002
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