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

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Practice Questions

1089 Total
Question 1071 Discuss
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Which of the following is a key reason why synchronous motors are not 'self-starting'?

A
They lack a stator winding
B
The rotor inertia is too high to instantly lock into the rotating magnetic field
C
They operate exclusively on DC power
D
The slip is always maintained at 100%

Answer & Explanation

Correct Option: B

The stator's magnetic field revolves at synchronous speed immediately. Due to inertia, the heavy rotor cannot instantly catch up to this speed, experiencing alternating torques instead.
Question 1072 Discuss
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A Superheterodyne receiver translates all incoming RF signals to a fixed intermediate frequency. This process relies mathematically on the principle of:

A
Heterodyning (mixing)
B
Amplification
C
Filtering
D
Rectification

Answer & Explanation

Correct Option: A

Heterodyning mixes two different frequencies (incoming RF and local oscillator) in a non-linear device to produce sum and difference frequencies, creating the constant IF.
Question 1073 Discuss
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Calculate the effective capacitance when a 10 uF and a 40 uF capacitor are connected perfectly in series.

A
50 uF
B
30 uF
C
8 uF
D
400 uF

Answer & Explanation

Correct Option: C

For capacitors in series, 1/C_eq = 1/C1 + 1/C2. 1/C_eq = 1/10 + 1/40 = 5/40. C_eq = 40/5 = 8 uF.
Question 1074 Discuss
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What defines the critical angle in optical fiber technology?

A
The angle at which the light beam exits the fiber
B
The angle of incidence above which total internal reflection occurs
C
The bending radius at which the fiber breaks physically
D
The minimum angle required to absorb scattered light

Answer & Explanation

Correct Option: B

The critical angle is the smallest angle of incidence (relative to the normal) for which a light ray traveling from core to cladding is totally reflected back into the core.
Question 1075 Discuss
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In AM receivers, Automatic Gain Control (AGC) is utilized primarily to:

A
Keep the audio output volume relatively constant despite variations in RF signal strength
B
Change stations automatically based on signal quality
C
Filter out adjacent channel interference completely
D
Boost the bass frequencies of the audio output

Answer & Explanation

Correct Option: A

AGC monitors the average DC level of the demodulated signal and feeds it back to control the gain of the RF/IF amplifiers, preventing fading from abruptly dropping audio volume.
Question 1076 Discuss
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In a basic cellular system, why do adjacent cells never use the same set of operating frequencies?

A
To avoid co-channel interference
B
To simplify billing software
C
Because handoffs require frequency changes
D
To force higher battery consumption

Answer & Explanation

Correct Option: A

Adjacent cells using the same frequency would cause severe co-channel interference where their coverage borders overlap, degrading signal quality heavily.
Question 1077 Discuss
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Which of the following is a primary characteristic of a 'Smart Battery' inside modern telecommunication devices?

A
It lacks internal chemistry
B
It contains internal circuitry to track state of charge, temperature, and health
C
It outputs pure AC voltage
D
It requires zero charging time

Answer & Explanation

Correct Option: B

A smart battery packs an embedded Battery Management System (BMS) chip to communicate precise metrics like voltage, temperature, and remaining runtime to the host device.
Question 1078 Discuss
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An ideal voltage source possesses an internal resistance of:

A
Infinity
B
100 Ohms
C
Zero
D
A variable value depending on load

Answer & Explanation

Correct Option: C

An ideal voltage source maintains its output voltage regardless of the current drawn. This is mathematically possible only if it has zero internal series resistance.
Question 1079 Discuss
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During the generation of single sideband (SSB) signals, which filter type is almost universally employed to isolate the desired sideband from the carrier and unwanted sideband?

A
Butterworth LC filter
B
Crystal filter or Mechanical filter
C
Simple RC low pass filter
D
Active op-amp filter

Answer & Explanation

Correct Option: B

Because the two sidebands in voice communications are very close together, separating them requires an extremely sharp cutoff (high Q factor), achieved best using crystal or mechanical filters.
Question 1080 Discuss
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In standard electrical terminology, what does 'MCB' denote?

A
Main Circuit Breaker
B
Miniature Circuit Breaker
C
Magnetic Current Breaker
D
Molded Case Box

Answer & Explanation

Correct Option: B

MCB stands for Miniature Circuit Breaker. It is a compact automatically operated electrical switch designed to protect low-voltage circuits from damage caused by overload or short circuit.
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