Which are the common transmission media used in digital communication system?

a) Coaxial cable

b) Twisted copper cable

c) Radio frequency bands

d) All of the mentioned

2. The basic transmission-reception system is a ______ system.

a) Two block system

b) Three block system

c) Four block system

d) None of the mentioned

3. Modulation channel consists of

a) Amplifier

b) Signal processing units

c) Amplifier & Signal processing units

d) None of the mentioned

4. Modulation channel does not accept an analog input signal.

a) True

b) False

5. If operating frequency bands are higher ______ is available.

a) Smaller bandwidth

b) Larger bandwidth

c) Smaller & Larger bandwidth

d) Cannot be determined

6. Ground wave communication occurs in

a) Low frequency band

b) Medium frequency band

c) Low & Medium frequency band

d) None of the mentioned

7. Sampling theorem is used for converting

a) Continuous time signal to discrete

b) Discrete to continuous time signal

c) Continuous time signal to discrete & vice versa

d) None of the mentioned

8. A signal can be recovered from its sample by using

a) Low pass filter

b) High pass filter

c) Band pass filter

d) Band stop filter

9. Which is practically realizable?

a) A train of pulses

b) Impulse train

c) All of the mentioned

d) None of the mentioned

10. In flat top sampling scheme, ______ is kept constant after sampling.

a) Amplitude

b) Phase

c) Frequency

d) Time period

11. Loop filter is a ______ used to reduce noise.

a) Low pass filter

b) High pass filter

c) Band pass filter

d) Band reject filter