1
GATE ECE 2010
+1
-0.3
The transfer characteristic for the precision rectifier circuit shown below is (assume ideal OP-AMP and practical diodes)
A
B
C
v
D
2
GATE ECE 2010
+1
-0.3
Assuming the OP-AMP to be ideal, the voltage gain of the amplifier shown below is
A
$$- {{{R_2}} \over {{R_1}}}$$
B
$$- {{{R_3}} \over {{R_1}}}$$
C
$$- \left[ {{{\left. {{R_{2\,}}} \right\|{R_3}} \over {{R_1}}}} \right]\,$$
D
$$- \left[ {{{{R_2} + {R_3}} \over {{R_1}}}} \right]$$
3
GATE ECE 2010
+1
-0.3
Consider an angle modulated signal x(t) = 6cos[2$$\mathrm\pi$$x106 t+2sin(8000$$\mathrm\pi$$t) + 4cos(8000$$\mathrm\pi$$t)] V. The average power of x(t) is.
A
10 W
B
18 W
C
20 W
D
28 W
4
GATE ECE 2010
+2
-0.6
X(t) is a stationary process with the power spectral density Sx(f) > 0 for all f. The process is passed through a system shown below.

Let Sy(f) be the power spectral density of Y(t). Which one of the following statements is correct?

A
Sy(f) > 0 for all f
B
Sy(f) > 0 for $$\left| f \right|$$ > 1 kH
C
Sy(f) > 0 for f = nf0, f0 = 2kHz, n any integer
D
Sy(f) > 0 for f = (2n + 1)f0, f0 = 1 kHz, n any integer
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