41. A Frequency Hopping Spread Spectrum system has its frequency synthesizers controlled by five stage shift-registers with feedback connections taken from the second and fifth stages. The number of slots available for frequency hopping is
42. Consider a WSS random process X(t), whose amplitudes are normally distributed with E(x(t)) = 0 and Rx(τ) = e-2[τ]. Then P(X(t)) ≤ 2) = ?
$$\left( {Q\left( \alpha \right) = \frac{1}{{\sqrt {2\pi } }}\int\limits_\alpha ^\infty {{e^{ - \frac{{{x^2}}}{2}}}} dx} \right)$$
$$\left( {Q\left( \alpha \right) = \frac{1}{{\sqrt {2\pi } }}\int\limits_\alpha ^\infty {{e^{ - \frac{{{x^2}}}{2}}}} dx} \right)$$
43. If fc is the carrier wave frequency and fm is the modulation frequency, then in the resulting amplitude modulated waveform the upperside band consists of:
44. For identical total transmitted power, the ratio of S/N for wide band FM to S/N of DSB-AM (with ma = 1) is:
(Given fm = 15 KHz & frequency deviation = ±75 KHz)
(Given fm = 15 KHz & frequency deviation = ±75 KHz)
45. The surface wave eventually disappears as one moves away from the transmitter because of
46. Which of the following is not true?
47. The amount of frequency deviation in FM signal depends on
48. The primary colour used in colour television is-
49. A 1 mW video signal having a bandwidth of 100 MHz is transmitted to a receiver through a cable that has 40 dB loss. If the effective one-sided noise spectral density at the receiver is 10-20 Watt/Hz, then the signal-to-noise ratio at the receiver is
50. Which of the following is not a digital-to-analog conversion?
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