In radar systems PRF stands for Power Return Factor Pulse Return Factor Pulse Re

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Correct Answer

Pulse Repetition Frequency

Explanation

PRF in radar systems means pulse repetition frequency.

Communication Systems problems

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1. A carrier is simultaneously modulated by two sine waves having modulation indices of 0.4 and 0.3. The total modulation index will be
Options
A. 0.1
B. 0.7
C. 0.5
D. 0.35

2. c(t) and m(t) are used to generate an FM signal. If the peak frequency deviation of the generated FM signal is three times the transmission bandwidth of the AM signal, then the coefficient of the term cos [2p(1008 x 10³t)] in the FM signal (in terms of the Bessel Coefficients) is
Options
A. 5 J₄(3)
B. J₈(3)
C. J₈(4)
D. 5 J₄(6)

3. When the channel is noisy, producing a conditional probability of error p = 0.5; the channel capacity and entropy function would be, respectively,
Options
A. 1 and 1
B. 1 and 0.5
C. 0.5 and 1
D. 0 and 1

4. If the bandwidth is increased by 2, the ?_FM ?_AM (where ? is the ratio of SNR of output to SNR at input, FM is frequency modulation and AM is amplitude modulation) is increased by a factor of
Options
A. 2
B. 3
C. 4
D. 6

6. In a fascimile reproduction time to scan one line is 2 ms. If it has 4% blanking, the visible trace time is
Options
A. 1.92 ms
B. 2.08 ms
C. 50 ms
D. 0.08 ms

7. The rate at which information can be carried through a communication channel depends on
Options
A. carrier frequency
B. bandwidth
C. transmission loss
D. transmitted power

8. A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10, 000 in one hour, the calling rate is
Options
A. 0.9
B. 10/9
C. 0.81
D. 0.1

10. It is desired that transmission line and load should match for a range of frequencies. The best method is
Options
A. to use a balun
B. to use a single stub of adjustable position
C. to use a double stub
D. to use a broad band amplifier

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