1
GATE ECE 2002
Subjective
+5
-0
The inputs to a digital circuit shown in Figure 9(a) are the external signals A, B and C. GATE ECE 2002 Digital Circuits - Combinational Circuits Question 9 English ( $$\overline A \,\overline B \,and\,\overline {C\,} $$ and are not available). The +5V power supply (logic 1) and the ground (logic 0) are also available. The output of the circuit is X = $$\overline A \,B + \,\overline A \,\overline B \,\,\overline {C\,} $$
(a) Write down the output function in its canonical SOP and POS forms.
(b) Implement the circuit using only two 2:1 multiplexers shown in the Figure where S is the data-select line, $${D_0}\,$$ and $${D_1}\,$$ are the input data lines and Y is the output lines. The function table for the multiplexer is given in table
2
GATE ECE 2002
MCQ (Single Correct Answer)
+1
-0.3
The VSWR can have any value between
A
0 and 1
B
- 1 and + 1
C
0 and $$\infty $$
D
1 and $$\infty $$
3
GATE ECE 2002
MCQ (Single Correct Answer)
+1
-0.3
In an impedance Smith chart, a clockwise movement along a constant resistance circle gives rise to
A
a decrease in the value of reactance
B
an increase in the value of reactance
C
no change in the reactance value
D
no change in the impedance value
4
GATE ECE 2002
MCQ (Single Correct Answer)
+2
-0.6
A plane wave is characterized by $$$\overrightarrow E = \left( {0.5\mathop x\limits^ \cap + \mathop y\limits^ \cap \,{e^{j\pi /2}}} \right){e^{j\omega t - jkz}}.$$$

This wave is

A
linearly polarized
B
circularly polarized
C
elliptically polarized
D
un polarized
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