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

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Practice Questions

1089 Total
Question 21 Discuss
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An analog signal has a maximum frequency component of 4 kHz. What is its Nyquist sampling rate?

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

Answer & Explanation

Correct Option: C

The Nyquist rate is twice the maximum frequency component. Fs = 2 * Fm = 2 * 4 kHz = 8 kHz.
Question 22 Discuss
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Which process in analog-to-digital conversion introduces irreversible error or noise into the signal?

A
Sampling
B
Quantization
C
Encoding
D
Multiplexing

Answer & Explanation

Correct Option: B

Quantization maps continuous amplitude values to discrete levels, permanently losing exact amplitude information (quantization noise).
Question 23 Discuss
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A PCM system samples a signal at 8 kHz and uses an 8-bit encoder. What is the resulting bit rate?

A
8 kbps
B
16 kbps
C
32 kbps
D
64 kbps

Answer & Explanation

Correct Option: D

Bit rate (Rb) = n * Fs = 8 bits/sample * 8000 samples/sec = 64,000 bps = 64 kbps.
Question 24 Discuss
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In digital communication, what is the primary advantage of Pulse Position Modulation (PPM) over Pulse Amplitude Modulation (PAM)?

A
Lower bandwidth requirement
B
Higher immunity to amplitude noise
C
Simpler circuitry
D
Ability to carry analog signals natively

Answer & Explanation

Correct Option: B

PPM conveys information via the position of the pulse, not its height, making it highly resistant to additive amplitude noise.
Question 25 Discuss
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In mobile networks, what type of handoff requires a mobile station to simultaneously communicate with both the old and new base stations?

A
Hard handoff
B
Soft handoff
C
Cellular handoff
D
Roaming handoff

Answer & Explanation

Correct Option: B

Soft handoff is a 'make-before-break' approach used heavily in CDMA, allowing dual connection to prevent dropping the call.
Question 26 Discuss
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Calculate the frequency reuse factor (cluster size) N if the shift parameters are i=2 and j=1.

A
3
B
4
C
7
D
9

Answer & Explanation

Correct Option: C

N = i^2 + ij + j^2 = 2^2 + (2)(1) + 1^2 = 4 + 2 + 1 = 7.
Question 27 Discuss
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The Global System for Mobile communications (GSM) utilizes which combination of multiple access techniques?

A
FDMA and CDMA
B
TDMA and CDMA
C
FDMA and TDMA
D
SDMA and FDMA

Answer & Explanation

Correct Option: C

GSM divides the frequency band into carriers (FDMA) and then divides each carrier into 8 time slots (TDMA).
Question 28 Discuss
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The 'Near-Far problem' is a significant challenge primarily associated with which mobile communication system?

A
GSM
B
CDMA
C
AMPS
D
TACS

Answer & Explanation

Correct Option: B

In CDMA, all users share the same frequency. A strong signal from a nearby mobile can drown out a weak signal from a distant one, requiring strict power control.
Question 29 Discuss
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What is the main objective of implementing cell sectoring in a mobile cellular network?

A
To increase the transmission power
B
To reduce co-channel interference
C
To decrease the number of base stations
D
To eliminate handoffs completely

Answer & Explanation

Correct Option: B

Replacing an omnidirectional antenna with directional antennas (sectors) limits the interference to and from co-channel cells.
Question 30 Discuss
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In optical fiber communication, what parameter dictates the light-gathering capability of the fiber?

A
Dispersion
B
Attenuation
C
Numerical Aperture
D
Cut-off wavelength

Answer & Explanation

Correct Option: C

Numerical Aperture (NA) determines the maximum angle at which light can enter the fiber and undergo total internal reflection.
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