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In a baseband communications link, frequencies upto 3500 Hz are used for signaling. Using a raised cosine pulse with 75% excess bandwidth and for no inter-symbol interference, the maximum possible signaling rate in symbols per second is
A
1750
B
2625
C
4000
D
5250
Correct Answer:
4000
A multimode graded index fiber exhibits a total pulse broadening of 0.15μs over a distance of 16 km. Estimate the maximum possible bandwidth, assuming no intersymbol interference.
A
4.6 MHz
B
3.9 MHz
C
3.3 MHz
D
4.2 MHz
A source produces binary data at the rate of 10 kbps. The binary symbols are represented as shown in the figure.
The source output is transmitted using two modulation schemes, namely Binary PSK (BPSK) and Quadrature PSK (QPSK). Let and B2 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<sub>1</sub> = 20 kHz, B<sub>2</sub> = 20 kHz
B
B<sub>1</sub> = 10 kHz, B<sub>2</sub> = 20 kHz
C
B<sub>1</sub> = 20 kHz, B<sub>2</sub> = 10 kHz
D
B<sub>1</sub> = 10 kHz, B<sub>2</sub>= 10 kHz
A source generates three symbols with probabilities 0.25, 0.25, 0.50 at a rate of 3000 symbols per second. Assuming independent generation of symbols, the most efficient source encoder would have average bit rate is
A
6000 bits/sec
B
4500 bits/sec
C
3000 bits/sec
D
1500 bits/sec
The raised cosine pulse p(t) is used for zero ISI in digital communications. The expression for p(t) with unity roll-off factor is given by $$p\left( t \right) = \frac{{\sin 4\pi \omega t}}{{4\pi \omega t\left( {1 - 16{\omega ^2}{t^2}} \right)}}.$$ The value of p(t) at $$t = \frac{1}{{4\omega }}$$ is
A
-0.5
B
0
C
0.5
D
∞
The minimum nyquist bandwidth needed for baseband transmission of Rs symbols per second is
A
Rs
B
2Rs
C
Rs/2
D
Rs2
In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of thefour alternatives.
That is why publicly invoking these symbols has to be an act of responsible citizenship and not self____________ demagoguery, but thedifference can be hard to _______________. The problem with emotive symbols is that _________________ they can multiply the force ofarguments, they cannot replace the arguments__________________. All persuasion harnesses symbols but principled persuasion must alsoprovide arguments that can be _____________ debated. The problem with emotive symbols is that _________________ they can multiply the force of arguments,
A
tough
B
though
C
through
D
Thorough
Intersymbol interference (ISI) leads to ________ probability of the receiver for making an error in detecting the symbols.
A
Increased
B
Decreased
C
Zero
D
One
For a baseband system with transmission rate 'rs' symbols/sec, what would be the required bandwidth?
A
$$\frac{{{r_s}}}{{2Hz}}$$
B
$$\frac{{{r_s}}}{{4Hz}}$$
C
$$\frac{{{r_s}}}{{8Hz}}$$
D
$$\frac{{{r_s}}}{{16Hz}}$$
Arrange the following sequence of extracellular signaling in the correct order? 1) Transport of signal to a target 2) Start of signal transduction pathways 3) Signaling cell synthesize and release signaling molecules 4) Binding of the signal to the specific receptor
A
2, 3, 4, 1
B
3, 1, 4, 2
C
1, 2, 3, 4
D
1, 3, 4, 2
Five channels, each with a 100-kHz bandwidth, are to be multiplexed together. What is the minimum bandwidth of the link if there is a need for a guard band of 10 kHz between the channels to prevent interference?
A
4600 kHz
B
500 kHz
C
540 kHz
D
580 kHz
