Digital Communication System MCQs
Practice free Digital Communication System multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 252 questions — no login required.
Question 217easy
The false alarm probability (Pr) in a radar is found to be 0.05 under conditions like the large prf and pulse integration. Then the detection probability
Question 218easy
Consider the following statements The total number of modes entering an optical fibre depends on 1. core radius 2. wavelength of the optical souce 3. refractive index profile Of these statements :
Question 219easy
In a pulse radar system, the received echo energy is inversely proportional to (R) is the range measured
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Question 221easy
The characteristic impedance of an air dielectric co-axial line is 77 W. If the air is replaced by a dielectric with er = 2.28, the characteristic impedance will be
Question 222easy
Consider the following features regarding satellite communication :
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Question 225easy
If the distance 'd' between the radar and the target is reduced to 'd/2', then the received power becomes 'N' times the power recived earlier. The value of 'N' is