1
GATE ECE 2005
+2
-0.6
Characteristic impedance of a transmission line is 50$$\Omega$$. Input impedance of the open-circuited line is $${Z_{oc}} = 100\, + \,j\,\,150\Omega .$$ When the transmission line is short-circuited the value of the input impedance will be
A
50 $$\Omega$$
B
100 + j 150 $$\Omega$$
C
7.69 + j 11.54 $$\Omega$$
D
7.69 - j 11.54 $$\Omega$$
2
GATE ECE 2005
+2
-0.6
Voltage standing wave pattern in a lossless transmission line with characteristic impedance 50 $$\Omega$$ and a resistive load is shown in Fig. The reflection coefficient is given by
A
- 0.6
B
- 1
C
0.6
D
0
3
GATE ECE 2004
+2
-0.6
Consider a 300$$\Omega$$, quarter-wave long (at 1 GHz) transmission line as shown in Fig. It is connected to a 10V, 50$$\Omega$$ sources at one end and is left open circuited at the other end. The magnitude of the voltage at the open circuit end of the line is A
10 V
B
5 V
C
60 V
D
60/7 V
4
GATE ECE 2004
+2
-0.6
Consider an impedance Z = R + jX marked with point P in an impedance Smith chart as shown in Fig. The movement from point P along a constant resistance circle in the clockwise direction by an angle $${45^ \circ }$$ is equivalent to A
adding an inductance in series with Z
B
adding a capacitance in series with Z
C
adding an inductance in shunt across Z
D
adding a capacitance in shunt across Z
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
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