The type of modulation used in the T.V. picture transmission is

Consider the following types of modulation: 1. Amplitude modulation 2. Frequency modulation 3. Phase modulation 4. Pulse modulation Which of the above modulation are used for telecasting TV programs?

A

2 and 3

B

3 and 4

C

1 and 2

D

1 and 4

Consider the following statements regarding modulation : 1. The communication systems, where a weak signal is transmitted by the use of a modulation is essential in carrier signal. 2. When the frequency of the high frequency signal is varied in accordance with the intensity of the low-frequency weak signal, the modulation is said to be frequency modulation. 3. The process of recovering original baseband signal from the modulated signal is called phase modulation. Which of the above statements are correct ?

A

1 and 3 only

B

1 and 2 only

C

2 and 3 only

D

1, 2 and 3

Which of the following modulation methods is used for the transmission of picture signals in TV transmission?

A

DSB - SC

B

PWM

C

VSB

D

FM

Consider the following statements in connection with deflection-type and null-type instruments: 1. Null-type instruments are more accurate than the deflection-type ones. 2. Null-type of instrument can be highly sensitive compared to a deflection-type instrument. 3. Under dynamic conditions, null-type instruments are less preferred to deflection-type instruments. 4. Response is faster in null-type instruments as compared to deflection-type instruments. Which of the above statements are correct?

A

1, 2 and 3

B

1, 2 and 4

C

1, 3 and 4

D

2, 3 and 4

স্লাইডে ছবি যুক্ত করার জন্য-i. Insert মেনুর রিবনে picture আইকন click করতে হবেii. Insert picture বক্স থেকে ছবি সংযোগ করতে হবেii. Picture রেডিও বোতাম সক্রিয় করতে হবেনিচের কোনটি সঠিক?

A

i ও ii

B

i ও iii

C

ii ও iii

D

i, ii ও iii

Pointing towards a picture, Ramesh said, "That picture is of sister of grandson of father of my maternal uncle". How is that lady in the picture related to Ramesh ?

A

Mother's sister

B

Cousin (maternal brother)

C

Cousin (maternal sister)

D

Father's sister

If the transmission co-efficient T₁ of a transmission line is 1.333 and the characteristic impedance of the λ/4 transmission line used is 100Ω, then the characteristic impedance of the transmission line is:

A

50Ω

B

100Ω

C

70.71Ω

D

None of the mentioned

Consider the following: 1. Pulse-position modulation. 2. Pulse-code modulation. 3. Pulse-width modulation. Which of the above communications are not digital?

A

1 and 2 only

B

2 and 3 only

C

1 and 3 only

D

1, 2 and 3

Consider the following grammar and the semantic actions to support the inherited type declaration attributes. Let X1, X2, X3, X4, X5 and X6 be the placeholders for the non-terminals D, T, L or L1 in the following table: Production rule Semantic action D → T L X1.type = X2.type T → int T.type = int T → float T.type = float L → L1, id X3.type = X4.type addType(id.entry, X5.type) L → id addType(id.entry, X6.type) Which one of the following are the appropriate choices for X1, X2, X3 and X4?

A

X₁ = L, X₂ = T, X₃ = L₁, X₄ = L

B

X₁ = T, X₂ = L, X₃ = L₁, X₄ = T

C

X₁ = L, X₂ = L, X₃ = L₁, X₄ = T

D

X₁ = T, X₂ = L, X₃ = T, X₄ = L₁

Which of the following statements are correct w.r.t. the vestigial sideband modulation? (i) As compared to SSB-SC, the bandwidth of the vestigial sideband becomes larger. (ii) The filter required needs to have a sharp cut-off. (iii) The transmitted vestige of the undesired sideband compensates for the loss of the wanted sideband. (iv) Vestigial sideband is used in TV for transmission of the picture and sound signals. Choose the correct answer from the code given below:

A

(i) and (ii) are correct

B

(i) and (iv) are correct

C

(i) and (iii) are correct

D

(iii) and (iv) are correct

The type of modulation used in the T.V. picture transmission is

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