Analog Communication Laboratory Viva Questions 6

Theory_Questions:

1). Identify the Non-linear modulation Technique?

a).AM

b).PM

c). FM

d). a&b

e).b&c

Answer: [E] b&c

2). The value of J n (ß) for ‘n’ even is

a).J—n(ß)

b).J—n (ß)

c).-J—n (ß)

d).-J—n (ß)

Answer: [A] —n(ß)

3).As ß<<1 (ß-modulation index), the significant Bessel functions are

a). J0(ß),J1(ß),J2(ß)

b).J0(ß)only

c).J1(ß) only

d).J0(ß),J1(ß)

Answer: [D] J0(ß),J1(ß)

4). for a general message signal m (t) having B.W of 4Khz with positive peak value is 8v and negative peak value is -4v. Kf=8 hz/volt then the B.W of angle modulated signal?

a). 80Khz

b). 136Khz

c). 4Khz

d). 144Khz

Answer: [B] 136Khz

5).A carrier is phase modulated with frequency deviation of 10Khz by a single tone frequency of 1Khz . if the single tone frequency is increased to 2Khz assuming phase deviation remains unchanged .BW of pm

a).48K

b).44K

c).24k

d).22k

Answer: [B] 44K

6). An angle modulated signal is S(t)=cos2π(2*106t+30 sin 150t+40cos150t) the maximum frequency and phase deviation of S(t) are

a).80π, 7Khz

b).7.5Khz, 80π

c). 7Khz, 60π

d). 7.5Khz, 100π

Answer: [D] 7.5Khz, 100

7) carrier signal c(t)= 5 cos 2π(106)t and m(t) = 4 cos (4π*103t)be the message signal they are used to generate an FM signal . if the maximum frequency deviation of FM is equal to the 3 times the transmission bandwidth of AM signal then what is amplitude of the component cos(2π(1008)*103t) in terms of based coefficient

a). 5 J2(6)

b). 5 J3(3)

c). 5J4(6)

d). 4J4(3)

Answer: [C] 5J4(6)

8). A carrier is phase modulated with frequency deviation of 10Khz by a single tone frequency of 1khz . if the single tone is increased to 2Khz then what is the frequency deviation of the phase modulated signal

a).10Khz

b). 5Khz

c).20Khz

d). 15 kHz

Answer: [C] 20Khz

9). An FM signal is given by 10cos(2π*105t+5 sin (2π*1500t)+7.5 sin (2π*1000t)) with carrier frequency 105Hz. Then what is the modulation index of FM wave

a).12.5

b).10

c). 15

d). 12

Answer: [B] 10

10). for a narrow band FM, IF the message is having B.W of 15khz, then what could be the frequency deviation?

a). 30Khz

b). 15khz

c). 5khz

d). 75khz

Answer: [C] 5khz


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