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

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Practice Questions

1089 Total
Question 1011 Discuss
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An MCB operates based on which two principles for providing protection against overload and short circuits?

A
Bimetallic thermal strip and magnetic trip coil
B
Chemical fuse and mechanical switch
C
Capacitive release and thermal expansion
D
Solid-state relay and thermal trip

Answer & Explanation

Correct Option: A

Miniature Circuit Breakers utilize a bimetallic strip for slow, sustained overloads (thermal) and a magnetic coil for instantaneous short-circuit currents.
Question 1012 Discuss
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Phase Modulation (PM) and Frequency Modulation (FM) are heavily related. Integrating a message signal before phase modulating it results in:

A
Amplitude Modulation
B
Frequency Modulation
C
Pulse Position Modulation
D
SSB Modulation

Answer & Explanation

Correct Option: B

Because frequency is the derivative of phase, passing a modulating signal through an integrator before applying it to a PM modulator mathematically produces an FM signal.
Question 1013 Discuss
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An induction motor stator has a synchronous speed of 3000 RPM. If the rotor turns at 2850 RPM, what is the per-unit slip?

A
0.05
B
0.15
C
0.50
D
0.95

Answer & Explanation

Correct Option: A

Slip s = (Ns - Nr) / Ns = (3000 - 2850) / 3000 = 150 / 3000 = 0.05 (or 5%).
Question 1014 Discuss
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What specifically happens to the depletion region of a PN junction diode when it is reverse-biased?

A
It completely disappears
B
It narrows significantly
C
It widens
D
It reverses polarity but maintains the same width

Answer & Explanation

Correct Option: C

Reverse biasing pulls majority charge carriers away from the junction, leaving behind more uncovered ions and widening the depletion region, which stops current flow.
Question 1015 Discuss
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A typical modern TV remote control communicates with the television set via:

A
UHF radio waves
B
Infrared (IR) signals
C
Ultrasonic sound waves
D
Visible laser light

Answer & Explanation

Correct Option: B

Standard TV remotes use an Infrared (IR) LED to transmit short pulses of light representing binary codes to an IR receiver on the television.
Question 1016 Discuss
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In the generation of an AM signal, which device mathematically behaves as a non-linear multiplier to combine the carrier and message signals?

A
Low Pass Filter
B
Envelope Detector
C
Square-law Modulator
D
Limiter

Answer & Explanation

Correct Option: C

A square-law device (like a diode operating in its non-linear region) takes the sum of the carrier and modulating signals and squares it, creating the needed product term for AM.
Question 1017 Discuss
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Which principle guarantees that high-speed fiber optic cables keep the light beam trapped inside the glass core?

A
Total Internal Reflection
B
Diffraction
C
Chromatic Dispersion
D
Refraction

Answer & Explanation

Correct Option: A

Because the core has a higher refractive index than the cladding, light hitting the boundary at a shallow angle undergoes Total Internal Reflection, bouncing continuously down the fiber.
Question 1018 Discuss
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A cluster size (N) of 7 is standard in cellular networks. If the total allocated spectrum allows for 350 channels, how many channels does each cell get?

A
7
B
50
C
350
D
2450

Answer & Explanation

Correct Option: B

Channels per cell = Total channels / Cluster size. 350 / 7 = 50 channels per individual cell site.
Question 1019 Discuss
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For a standard audio signal sampled at 8 kHz and quantized using 8 bits per sample, calculate the resulting bit rate.

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

Answer & Explanation

Correct Option: C

Bit rate (R) = Sampling rate (fs) * Number of bits (n). R = 8000 samples/sec * 8 bits/sample = 64,000 bits/sec or 64 kbps.
Question 1020 Discuss
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What is the primary function of the 'color burst' signal in composite color television?

A
To synchronize the horizontal scanning
B
To provide the phase and frequency reference for color demodulation
C
To set the overall picture brightness
D
To switch between progressive and interlaced modes

Answer & Explanation

Correct Option: B

The color burst is a short burst of the unmodulated color subcarrier sent during the horizontal blanking period, allowing the receiver's oscillator to synchronize precisely.
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