Home / MCQ Bank / Electronics and Communication

Electronics and Communication Communication Systems Difficulty: Medium

A satellite orbiting in 600 km orbit transmits 5 GHz frequency. The Doppler shift observed at the ground station, when the satellite is over head of the station is Identify the 'CORRECT' statements, 1. Loading effect is primarily caused by instruments having low sensitivity. 2. Relative error is the difference between the measured value and the true value. 3. Resolution is small increment is measurand that can be detected with certainty by the instrument. 4. Moving-coil permanent magnet instruments can be used for the measurements of AC and DC. An 8 level encoding scheme is used in a PCM system of 10 kHz channel BW. The channel capacity is A charge Q 2 = 8.854 × 10 -9 C is located in a vacuum at P 2 (2, 3, 1). The force on Q 2 due to a charge Q 1 = 4π × 10 -3 C at P 1 (2, 2, 1) is: (Note : All the coordinates are measured in Meters. a x , a y and a z are unit vectors in X, Y and Z direction respectively.) A signal x(t) has a Fourier transform X(ω). If x(t) is a real and odd function of t, then X(ω) is