Analog and Digital Communication

Vn is Directly proportional to k2 ✘ Vn is Directly proportional to k ✘

Vn is Directly proportional to √k

✘ Vn is Directly proportional to k3 ✔

fs ≥ 2fm

✘

fs < 2fm

✘

fs > fm

✘

fs < fm

✔

The sampled signal is passed through low pass filter ✘ Filter has the cut off frequency wm ✘ Both a and b ✘ None of the above ✔

fs > 2fm

✘

fs < 2fm

✘

fs = 2fm

✘

fs ≥ 2fm

✔

Passes the frequencies lower than the specified cut off frequency ✘ Rejects higher frequencies ✘ Is used to recover signal from sampled signal ✘ All of the above ✔

Instantaneous sampling ✘ Natural sampling ✘ Flat top sampling ✘ All of the above ✔

Has a train of impulses ✘ Has the pulse width approaching zero value ✘ Has the negligible power content ✘ All of the above ✔

Instantaneous sampling ✘ Natural sampling ✘ Flat top sampling ✘ All of the above ✔

Pulse amplitude modulation ✘ Pulse time modulation ✘ Frequency modulation ✘ Both a and b ✔

Amplitude of the pulse train is varied ✘ Width of the pulse train is varied ✘ Frequency of the pulse train is varied ✘ None of the above ✔