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Question 191

JK Police Constable 2024• Test

In TV transmission, the picture signal is amplitude-modulated and the sound signal is frequency-modulated. This is done because

  1. AOption (a)

    A) it is not possible to frequency modulate the picture signal.

  2. BOption (b)

    B) bandwidth requirement is minimized

  3. COption (c)

    C) Sound signal is more susceptible to noise than a picture signal.

  4. DOption (d)

    D) synchronization of picture frames becomes easier.

View answer & explanation

Correct answer

Answer: (a)A.

A) it is not possible to frequency modulate the picture signal.

Explanation not yet available.

Question 192

JK Police Constable 2024• Test

The colour TV picture signal is a

  1. AOption (a)

    A) single-channel, one - dimensional signal

  2. BOption (b)

    B) three-channel, three - dimensional signal

  3. COption (c)

    C) three-channel, one - dimensional signal

  4. DOption (d)

    D) single-channel, three - dimensional signal

View answer & explanation

Correct answer

Answer: (a)A.

A) single-channel, one - dimensional signal

Explanation not yet available.

Question 193

JK Police Constable 2024• Test

Which of the following statements is correct regarding induction motor?

  1. AOption (a)

    A) The power factor of a 1-phase induction motor is high, while the power factor of a 3-phase induction motor is low

  2. BOption (b)

    B) 1-phase induction motors produce low starting torque, whereas 3-phase induction motors produce high starting torque

  3. COption (c)

    C) The efficiency of a 1-phase induction motor is more as compared to a 3-phase induction motor

  4. DOption (d)

    D) All options A, B and C are correct

View answer & explanation

Correct answer

Answer: (a)A.

A) The power factor of a 1-phase induction motor is high, while the power factor of a 3-phase induction motor is low

Explanation not yet available.

Question 194

JK Police Constable 2024• Test

For a dipole antenna

  1. AOption (a)

    A) the current distribution along its length is uniform irrespective of its length

  2. BOption (b)

    B) the effective length equals thrice of its physical length

  3. COption (c)

    C) the radiation intensity is maximum along the normal to the dipole axis

  4. DOption (d)

    D) the input impedance is independent of the location of the feed point

View answer & explanation

Correct answer

Answer: (a)A.

A) the current distribution along its length is uniform irrespective of its length

Explanation not yet available.

Question 195

JK Police Constable 2024• Test

Match List-X (Medium type) with List-Y (Frequency range) and select the correct answer using the codes given below the lists:

List-XList-Y
i. Open wire1. 100 KHz
ii. Twisted pair2. 100 MHz
iii. Coaxial cable3. 5 KHz

Codes:

i            ii           iii

  1. AOption (a)

    3, 2, 1

  2. BOption (b)

    3, 1, 2

  3. COption (c)

    2, 3, 1

  4. DOption (d)

    2, 1, 3

View answer & explanation

Correct answer

Answer: (a)A.

3, 2, 1

Explanation not yet available.

Question 196

JK Police Constable 2024• Test

Fill in the blank. "The generation of single sideband suppressed carrier (SSB-SC) signal is done by———— discrimination methods."

  1. AOption (a)

    Phase

  2. BOption (b)

     Frequency

  3. COption (c)

    Both A and B

  4. DOption (d)

    None of the above

View answer & explanation

Correct answer

Answer: (a)A.

Phase

Explanation not yet available.

Question 197

JK Police Constable 2024• Test

Which of the following best describes interlaced scanning in a picture tube?

  1. AOption (a)

    Scanning lines progressively from top to bottom in one pass

  2. BOption (b)

    Scanning odd lines first and then even lines in two passes

  3. COption (c)

    Scanning all lines simultaneously in a single pass

  4. DOption (d)

    Scanning half of the lines in the first pass and the other half in the second pass

View answer & explanation

Correct answer

Answer: (a)A.

Scanning lines progressively from top to bottom in one pass

Explanation not yet available.

Question 198

JK Police Constable 2024• Test

Match the following terms with their correct descriptions and select the correct answer using the codes given below the lists.

List-XList-Y
i. Progressive scanning1. Transmits only one sideband of the signal
ii. SSB2. Scans each line in sequence
iii. UHF3. Frequency ranges from 300 MHz to 3 GHz
iv. Negative picture pulses4. Pulses represent darker areas with higher voltage

Codes:

i        ii            iii           IV

  1. AOption (a)

    1,  2,  3,  4

  2. BOption (b)

    4,  1,  3,  2

  3. COption (c)

    2,  1,   3,  2

  4. DOption (d)

    2,  4,  3,  1

View answer & explanation

Correct answer

Answer: (a)A.

1,  2,  3,  4

Explanation not yet available.

Question 199

JK Police Constable 2024• Test

Which of the following is true about a composite video signal?

  1. AOption (a)

    It includes audio, colour, and sync information in one signal

  2. BOption (b)

     It contains only the video component with no sync or color information

  3. COption (c)

     It uses only one sideband in the transmission

  4. DOption (d)

    It is used exclusively in SHF channels

View answer & explanation

Correct answer

Answer: (a)A.

It includes audio, colour, and sync information in one signal

Explanation not yet available.

Question 200

JK Police Constable 2024• Test

Match the following terms with their correct descriptions and select the correct answer using the codes given below the lists.

List-XList-Y
i. VHF1. Commonly used for FM radio and TV channels
ii. UHF2. Used in cellular networks and TV broadcasting
iii. HF3. Mainly used in amateur and shortwave radio
iv. SHF4. Often used in satellite communications

Codes:

i       ii      iii      IV

  1. AOption (a)

    1,  3,  2,  4

  2. BOption (b)

    3,  4,  1,  2

  3. COption (c)

    4,  3,  2,  1

  4. DOption (d)

    1,  2,  3,  4

View answer & explanation

Correct answer

Answer: (a)A.

1,  3,  2,  4

Explanation not yet available.
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