1
GATE ECE 2002
MCQ (Single Correct Answer)
+1
-0.3
A 1 MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100 µsec. Which of the following frequencies will NOT be present in the modulated signal?
A
990 kHz
B
1010 kHz
C
1020 kHz
D
1030 kHz
2
GATE ECE 1999
MCQ (Single Correct Answer)
+1
-0.3
A modulated signal is given by, $$s\left(t\right)=m_1\left(t\right)\cos\left(2{\mathrm{πf}}_\mathrm c\mathrm t\right)\;+m_2\left(t\right)\sin\left(2{\mathrm{πf}}_\mathrm c\mathrm t\right)$$, where the baseband signal m1(t) and m2(t) have bandwidths of 10 kHz and 15 kHz, respectively. The bandwidth of the modulated signal, in kHz, is
A
10 kHz
B
15 kHz
C
25 kHz
D
30 kHz
3
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
The image channel selectivity of super heterodyne receiver depends upon
A
IF amplifiers only
B
RF and IF amplifiers only
C
Preselector, RF and IF amplifiers
D
Pre selector, and RF amplifiers only
4
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
A DSB-SC signal is generated using the carrier $$\cos\left(\omega_ct\;+\;\theta\right)$$ and modulating singal x(t). The envelope of the DSB-SC signal is
A
x(t)
B
$$\left|x\left(t\right)\right|$$
C
only positive portion of x(t)
D
$$x\left(t\right)\cos\left(\theta\right)$$
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