Analog Communication Laboratory Viva Questions 5

Theory_Questions:

1. Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth ?

a) VSB

b) DSB-SC

c) SSB

d) AM

Answer: [C] SSB

2. Match the following

A) AM system 1) Envelope/Diode detection

B) SSB 2) Bandwidth is B ( 'B' is Band width of message signal)

C) VSB 3) Band width slightly greater than B

a) A-1, B-2, C-3

b) A-3, B-1, C-2

c) A-1, B-3, C-2

d) A-3, B-2, C-1

Answer: [A] A-1, B-2, C-3

3. Which of the following analog modulation scheme suitable for transmission of video signals

a) VSB

b) DSB-SC

c) SSB

d) AM

Answer: [A] VSB

4. Which of the following condition has to be satiesfied by VSB filter H(f) for perfect demodulation of VSB signal, Where fc is carrier frequency ?

a) H(f-fc)+H(f+fc)=0

b) H(f-fc)+H(f+fc)=constant

c) H(f-fc)-H(f+fc)=1

d) H(f-fc)-jH(f+fc)=H(fc)

Answer: [B] H(f-fc)+H(f+fc)=constant

5. In a superheterodyne AM receiver IF(intermediate frequency) is 455 KhZ and it is tuned to 500 KhZ. Then what is Image Frequency in KhZ?

a) 455

b) 500

c) 1410

d) 1000

Answer: [C] 1410

6. In a superheterodyne AM receiver IF( intermediate frequency ) is 455 KhZ then what is the separation between incoming signal frequency and it's image frequency in KhZ?

a) 910

b) 500

c) 1410

d) 100

Answer: [A] 910

7. In AM signal the power in each side band is 150 Watts and total transmited power is 1000 Watts then what is modulation index μ ?

a) 0.9258

b) 1

c) 0.34867

d) 0.1945

Answer: [A] 0.9258

8. Consider AM signal s(t) = A[1+cos(wmt)]cos(wct). Then What is modulation efficiency in %

a) 33.33

b) 50

c) 100

d) 45

Answer: [A] 33.33

9. Hilbert transform of m(t)sin(w0t) is, Where m(t) is low pass signal

a) -m(t)sin(w0t)

b) m(t)cos(w0t)

c) -m(t)cos(w0t)

d) None

Answer: [C] -m(t)cos(w0t)

10. Hilbert transform of a constant k is (Here all the signals have usual notations)

a) 0

b) k[-jsgn(f)]

c) kδ(f)

d) None

Answer: [A] 0


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