1
GATE ECE 2004
MCQ (Single Correct Answer)
+2
-0.6
Three analog signals, having bandwidths 1200 Hz, 600 Hz and 600 Hz are sampled at their respective Nyquist rates, enocodes with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is
A
115.2 kbps
B
28.8 kbps
C
57.6 kbps
D
38.4 kbps
2
GATE ECE 2004
MCQ (Single Correct Answer)
+2
-0.6
A source produces binary data at the rate of 10 kbps. The binary symbols are represented as shown in fig. The source output is transmitted using two modulation schemes, namely Binary PSK (BPSK) and Quadrature PSK (QPSK). Let $${B_1}$$ and $${B_2}$$ be the bandwidth requirements of BPSK and QPSK respectively. Assuming that the bandwidth of the above rectangular pulses is 10 kHz, $${B_1}$$ and $${B_2}$$ are
A
$${B_1}$$ = 20 KHz, $${B_2}$$ = 20 KHz
B
$${B_1}$$ = 10 KHz, $${B_2}$$ = 20 KHz
C
$${B_1}$$ = 20 KHz, $${B_2}$$ = 10 KHz
D
$${B_1}$$ = 10 KHz, $${B_2}$$ = 10 KHz
3
GATE ECE 2004
MCQ (Single Correct Answer)
+2
-0.6
Choose the correct one from among the alternatives A, B, C, D after matching an item from Group 1 with the most appropriate item in Group 2.

Group
1. FM
2. DM
3. PSK
4. PCM

Group 2
Q: $${\mu - law}$$
R: Envelope detector
S: Capture effect
T: Hilbert transform
U: Matched filter

A
1 - T, 2 - P, 3 - U, 4 - S
B
1 - S, 2 - U, 3 - P, 4 - T
C
1 - S, 2 - P, 3 - U, 4 - Q
D
1 - U, 2 - R, 3 - S, 4 - Q
4
GATE ECE 2003
MCQ (Single Correct Answer)
+2
-0.6
The input to a linear delta modulator having a step size $$\Delta$$ = 0.628 is a sine wave with frequency fm and peak amplitude Em. If the sampling frequency fs = 40 KHz. the combination of the sine-wave frequency and the amplitude, where slope overload will take place is
A
Em 0.3V, Fm 8 KHz
B
Em 1.5V, Fm 4 KHz
C
Em 1.5V, Fm 2 KHz
D
Em 3.0V, Fm 1 KHz
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