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Question 151

JK Police Constable 2024• Test

In T. V., the picture signal is

  1. AOption (a)

    Amplitude modulated and at the low-frequency end of each channel allocation

  2. BOption (b)

    Frequency modulated and at the low-frequency end of each channel allocation

  3. COption (c)

    Amplitude modulated and at the high frequency end of each channel allocation

  4. DOption (d)

    None of above

View answer & explanation

Correct answer

Answer: (a)A.

Amplitude modulated and at the low-frequency end of each channel allocation

Explanation not yet available.

Question 152

JK Police Constable 2024• Test

A PAM signal can be demodulated using

  1. AOption (a)

    A High pass filter

  2. BOption (b)

    A Band pass filter

  3. COption (c)

     A Low pass filter

  4. DOption (d)

    None of the above

View answer & explanation

Correct answer

Answer: (a)A.

A High pass filter

Explanation not yet available.

Question 153

JK Police Constable 2024• Test

In time-division-multiplexing, each multiplexed signal occupies;

  1. AOption (a)

    A Fraction of the Transmission Bandwidth

  2. BOption (b)

    The Entire Transmission Bandwidth

  3. COption (c)

    A Bandwidth Equal to the Bandwidth of each input signal

  4. DOption (d)

    None of the above

View answer & explanation

Correct answer

Answer: (a)A.

A Fraction of the Transmission Bandwidth

Explanation not yet available.

Question 154

JK Police Constable 2024• Test

What will be the upper sideband and lower sideband frequencies for amplitude modulation of a 5-kHz signal with 40-KHz carrier frequency?

  1. AOption (a)

    42.5 kHz and 37.5 kHz, respectively

  2. BOption (b)

    45 kHz and 35 kHz, respectively

  3. COption (c)

    50 kHz and 30 kHz, respectively

  4. DOption (d)

    25 kHz and 15 kHz, respectively

View answer & explanation

Correct answer

Answer: (a)A.

42.5 kHz and 37.5 kHz, respectively

Explanation not yet available.

Question 155

JK Police Constable 2024• Test

In FM to AM conversion, the input of the frequency-modulated signal converted into amplitude modulated signal by———

  1. AOption (a)

    Differentiator

  2. BOption (b)

    Integrator

  3. COption (c)

    Comparator

  4. DOption (d)

    None of the above

View answer & explanation

Correct answer

Answer: (a)A.

Differentiator

Explanation not yet available.

Question 156

JK Police Constable 2024• Test

Pulse amplitude modulation is a process whereby;

  1. AOption (a)

    The position of the pulse is changed as a function of the sampled value

  2. BOption (b)

    The width of the pulse is varied as a function of time

  3. COption (c)

    The height of a pulse is made proportional to the sampled value

  4. DOption (d)

    None of the above

View answer & explanation

Correct answer

Answer: (a)A.

The position of the pulse is changed as a function of the sampled value

Explanation not yet available.

Question 157

JK Police Constable 2024• Test

The amplitude modulation signal without a carrier is known as——

  1. AOption (a)

    SSB-SC

  2. BOption (b)

    DSB-SC

  3. COption (c)

    Both A and B

  4. DOption (d)

    None of the above

View answer & explanation

Correct answer

Answer: (a)A.

SSB-SC

Explanation not yet available.

Question 158

JK Police Constable 2024• Test

Choose the incorrect statement

  1. AOption (a)

    SMPS is less sensitive to input voltage variations

  2. BOption (b)

    SMPS is smaller as compared to rectifiers

  3. COption (c)

    SMPS has low input ripple

  4. DOption (d)

    SMPS is a source of radio interference

View answer & explanation

Correct answer

Answer: (a)A.

SMPS is less sensitive to input voltage variations

Explanation not yet available.

Question 159

JK Police Constable 2024• Test

The magnetic field produced in the stator of a three phase induction motor travels at

  1. AOption (a)

    Rotating speed

  2. BOption (b)

    Synchronous speed

  3. COption (c)

    Asynchronous speed

  4. DOption (d)

    Slip speed

View answer & explanation

Correct answer

Answer: (a)A.

Rotating speed

Explanation not yet available.

Question 160

JK Police Constable 2024• Test

Alternating Current (AC) cannot be measured by DC ammeter because:

  1. AOption (a)

    Alternating current cannot pass through the DC ammeter

  2. BOption (b)

    Average value of complete cycle is zero

  3. COption (c)

    Alternating current changes its direction

  4. DOption (d)

    None of the above

View answer & explanation

Correct answer

Answer: (a)A.

Alternating current cannot pass through the DC ammeter

Explanation not yet available.
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