1
GATE ECE 2011
MCQ (Single Correct Answer)
+2
-0.6
Two D flip-flops are connected as a synchronous counter that goes through the following QB QA sequence $$00 \to 11 \to 01 \to 10 \to 00 \to ......$$
A
$${D_A} = {Q_{B,}}\,{D_B} = {Q_A}$$
B
$${D_A} = {\overline Q _A},\,{D_B} = {\overline Q _B}$$
C
$${D_A} = \left( {{Q_A}\,{{\overline Q }_B}\, + {{\overline Q }_A}\,{Q_B}} \right),\,\,{D_B} = {Q_A}$$
D
$${D_A} = \left( {{Q_A}{Q_B} + {{\overline Q }_A}{{\overline Q }_B}} \right),\,\,{D_B} = {\overline Q _B}$$
2
GATE ECE 2011
MCQ (Single Correct Answer)
+1
-0.3
The output Y in the circuit below is always ‘1’ when GATE ECE 2011 Digital Circuits - Logic Gates Question 22 English
A
two or more of the inputs P, Q, R are ‘0’
B
two or more of the inputs P, Q, R are ‘1
C
any odd number of the inputs P, Q, R is ‘0’
D
any odd number of the inputs P, Q, R is ‘1’
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 2011
MCQ (Single Correct Answer)
+2
-0.6
A transmission line of characteristic impedance 50 $$\Omega $$ is terminated in a load impedance $$Z_L$$. The VSWR of the line is measured as 5 and the first of the voltage naxima in the line is observed at a distance of $$\lambda /4$$ from the load. The value of $$Z_L$$ is
A
10 $$\Omega $$
B
250 $$\Omega $$
C
(19.23 + j 46.15) $$\Omega $$
D
(19.23 - j 46.15)$$\Omega $$
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