Communication Systems - Study Mode
[#161] The probability density function F(x) = ae -b|x| , where x is a random variable whose allowable value range is from x = -∞ to x = +∞. The CDF for this function for x ≥ 0 is
Correct Answer
(B) $$frac{a}{b}left( {2 - {e^{ - bx}}}
ight)$$
[#162] High value of Q factor is preferred for coil used in radio receiver because
Correct Answer
(A) It makes the circuit more selective
[#163] Noise factor of a system is defined as
Correct Answer
(C) Ratio of input S/N ratio to output S/N ratio
[#164] A 4 GHz carrier is DSB-SC modulated by a low pass message signal with maximum frequency of 2 MHz. The resultant signal can be ideally sampled by sampling impulse train with frequency of
Correct Answer
(D) 8.004 MHz
[#165] An angle modulated signal with carrier frequency ω c = 2π × 10 5 is described by the equation s(t) = 10cos(ω c t + 5sin(3000πt) + 10sin(2000πt). What is the frequency deviation ∆f?
Correct Answer
(B) 17500 Hz