1
GATE ECE 2009
+2
-0.6
A transmission line terminates in two branches, each of length $$\lambda /4$$, as shown.The branches are terminated by 50 $$\Omega$$ loads. The lines are lossless and have the characteristic impedances shown. Determine the impedance $${Z_i}$$ as seen by the source.
A
200 $$\Omega$$
B
100 $$\Omega$$
C
50 $$\Omega$$
D
25 $$\Omega$$
2
GATE ECE 2009
+1
-0.3
Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown?
A
Only P has no cutoff- frequency
B
Only Q has no cutoff-frequency
C
Only R has no cutoff-frequency
D
All three have cutoff-frequencies
3
GATE ECE 2009
+2
-0.6
In the circuit below, the diode is ideal. The voltage V is given by
A
Min (Vi, 1)
B
Max (Vi, 1)
C
Min (-Vi, 1)
D
Max (-Vi, 1)
4
GATE ECE 2009
+2
-0.6
Consider the CMOS circuit shown, where the gate voltage of the n-MOSFET is increased from zero, while the gate voltage of the p-MOSFET is kept constant at 3 V. Assume that, for both transistors, the magnitude of the threshold voltage is 1 V and the product of the transconductance parameter and the $$\left(\frac WL\right)$$ ratio, i.e. the quantity $$\mu C_{ox}\left(\frac WL\right)$$ , is 1 mAV-2.
For small increase in VG beyond 1 V, which of the following gives the correct description of the region of operation of each MOSFET?
A
Both the MOSFETs are in saturation region
B
Both the MOSFETs are in triode region
C
n-MOSFET is triode and p-MOSFET is in saturation region
D
n-MOSFET is in saturation and p-MOSFET is in triode region
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