1
GATE ECE 2012
+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 $$\Omega$$
2
GATE ECE 2011
+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
$$3\,\, \times \,\,{10^8}\,m/s$$
3
GATE ECE 2010
+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
4
GATE ECE 2010
+1
-0.3
If the scattering matrix [S] of a two port network is $$\left[ S \right] = \left[ {\matrix{ {0.2\,\angle \,\,{0^ \circ }} & {0.9\,\,\angle \,\,{{90}^ \circ }} \cr {0.9\,\angle \,\,{{90}^ \circ }} & {0.1\,\angle \,{{90}^ \circ }} \cr } } \right]$$\$ then the network is
A
lossless and reciprocal
B
lossless but not reciprocal
C
not lossless but reciprocal
D
neither lossless nor reciprocal
GATE ECE Subjects
Signals and Systems
Network Theory
Control Systems
Digital Circuits
General Aptitude
Electronic Devices and VLSI
Analog Circuits
Engineering Mathematics
Microprocessors
Communications
Electromagnetics
EXAM MAP
Joint Entrance Examination