1
GATE ECE 2014 Set 3
+1
-0.3
Consider an FM signal $$f\left(t\right)\;=\;\cos\left[2{\mathrm{πf}}_\mathrm c\mathrm t\;+\;{\mathrm\beta}_1\sin\;2{\mathrm{πf}}_1\mathrm t\;+\;{\mathrm\beta}_2\sin\;2{\mathrm{πf}}_2\mathrm t\right]$$ . The maximum deviation of the instantaneous frequency from the carrier frequency fc is
A
$$\beta_1f_1+\;\beta_2f_2$$
B
$$\beta_1f_2+\;\beta_2f_1$$
C
$$\beta_1+\;\beta_2$$
D
$$f_1+\;f_2$$
2
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
3
GATE ECE 2008
+1
-0.3
Consider the amplitude modulated (AM) signal $$A_c\cos\omega_ct\;+\;2\cos\omega_mt\;\cos\omega_ct$$. For demodulating the signal using envelope detector, the minimum value of Ac should be
A
2
B
1
C
0.5
D
$$0$$
4
GATE ECE 2005
+1
-0.3
Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?
A
VSB
B
DSB-SC
C
SSB
D
AM
EXAM MAP
Medical
NEET