Jkp Constable Telecommunication Telecommunication Mcqs Jkp Constable (1089 MCQs) | JKSSB & SSC Quiz

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Practice Questions

1089 Total
Question 71 Discuss
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An AM signal is modulated simultaneously by two tones with modulation indices of 0.3 and 0.4. What is the overall modulation index?

A
0.1
B
0.5
C
0.7
D
0.12

Answer & Explanation

Correct Option: B

Total modulation index mt = sqrt(m1^2 + m2^2) = sqrt(0.09 + 0.16) = sqrt(0.25) = 0.5.
Question 72 Discuss
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Which diversity technique mitigates fading by transmitting the same signal simultaneously on different carrier frequencies?

A
Space diversity
B
Time diversity
C
Frequency diversity
D
Polarization diversity

Answer & Explanation

Correct Option: C

Frequency diversity uses multiple frequencies separated by more than the coherence bandwidth to ensure independent fading paths.
Question 73 Discuss
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In the PAL color television system, what is the exact frequency of the color subcarrier?

A
3.58 MHz
B
4.43 MHz
C
5.5 MHz
D
6.0 MHz

Answer & Explanation

Correct Option: B

The PAL (Phase Alternating Line) standard primarily used in India utilizes a color subcarrier frequency of 4.43361875 MHz.
Question 74 Discuss
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An axial-mode helical antenna emits electromagnetic waves with which type of polarization?

A
Horizontal
B
Vertical
C
Circular
D
Elliptical

Answer & Explanation

Correct Option: C

When operating in the axial mode, the geometry of a helical antenna naturally produces circularly polarized waves.
Question 75 Discuss
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In a 16-QAM digital modulation scheme, how many bits are transmitted per symbol?

A
2 bits
B
4 bits
C
8 bits
D
16 bits

Answer & Explanation

Correct Option: B

In M-ary modulation, the number of bits per symbol is log2(M). For 16-QAM, log2(16) = 4 bits.
Question 76 Discuss
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Calculate the Shannon channel capacity of a telephone line with a bandwidth of 3 kHz and a Signal-to-Noise Ratio (SNR) of 15.

A
12 kbps
B
24 kbps
C
45 kbps
D
48 kbps

Answer & Explanation

Correct Option: A

C = B * log2(1 + SNR) = 3000 * log2(1 + 15) = 3000 * log2(16) = 3000 * 4 = 12,000 bps = 12 kbps.
Question 77 Discuss
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What is the primary advantage of deploying microcells in a cellular communication network?

A
To increase transmission distance over rural areas
B
To provide capacity relief in high-density urban areas
C
To decrease handoff processing
D
To increase the height of base station antennas

Answer & Explanation

Correct Option: B

Microcells shrink the cell size, drastically increasing frequency reuse and thus network capacity in heavily populated urban zones.
Question 78 Discuss
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Which of the following causes the lowest amount of intrinsic signal loss when joining two optical fibers?

A
Mechanical splicing
B
Fusion splicing
C
Connectorized mating
D
Index matching fluid only

Answer & Explanation

Correct Option: B

Fusion splicing melts the two glass ends together perfectly, resulting in typical insertion losses of less than 0.1 dB.
Question 79 Discuss
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In a Flyback converter based SMPS, energy is transferred to the secondary winding when the switching transistor is:

A
Turned ON
B
Turned OFF
C
Operating in active region
D
Saturated completely

Answer & Explanation

Correct Option: B

In a flyback topology, energy is stored in the transformer's magnetic field during the ON time and released to the output during the OFF time.
Question 80 Discuss
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In a relational database, what is the purpose of a Foreign Key?

A
To uniquely identify each row in a table
B
To establish a link between the data in two tables
C
To index a table for faster searches
D
To automatically encrypt confidential records

Answer & Explanation

Correct Option: B

A foreign key creates a relationship by referencing the primary key of another table, ensuring referential integrity.
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