MISSISSIPPI (MS) COMMUNICATION SYSTEMS COMPLETE EXAM QUESTIONS AND ANSWERS TO HELP YOU PASS

What is the primary purpose of a communication system?
A) Store data B) Transmit information reliably C) Generate power D)
Amplify signals
ANSWER : B — It conveys information between points reliably and
efficiently.
1. Which component generates the signal for transmission?
A) Receiver B) Transmitter C) Channel D) Antenna
ANSWER : B — Transmitter prepares the message for the channel.
2. Where does noise primarily affect a signal?
A) Source B) Transmitter C) Channel D) Receiver
ANSWER : C — Noise is introduced mostly while the signal travels
through the medium.
3. Which is a basic component of any communication system?
A) Router B) Transmitter C) Firewall D) Database
ANSWER : B — Along with channel and receiver.
4. What does “modulation” mean?
A) Moving a signal through air B) Varying a carrier to carry
information C) Reducing noise D) Converting DC to AC
ANSWER : B — It changes amplitude/frequency/phase per information.
5. What is “bandwidth”?
A) Signal power B) Frequency range a channel can carry C) Distance
of transmission D) Noise level
ANSWER : B — Range of frequencies transmitted.
6. What does SNR stand for?
A) Signal to Network Ratio B) Signal to Noise Ratio C) Sample to

, Noise Ratio D) System to Network Rate
ANSWER : B — It quantifies signal strength relative to noise.
7. What is attenuation?
A) Signal gain B) Signal loss over distance C) Frequency shift D)
Noise cancellation
ANSWER : B — Decrease of signal amplitude in transit.
8. Frequency is measured in:
A) Watts B) Volts C) Hertz D) Amperes
ANSWER : C — Number of cycles per second.
9. Amplitude Modulation (AM) changes:
A) Frequency B) Phase C) Amplitude D) Carrier waveform
ANSWER : C — AM varies amplitude for information.
10.Frequency Modulation (FM) varies:
A) Amplitude B) Frequency C) Power D) Noise
ANSWER : B — FM varies frequency per input.
11.A repeater is used to:
A) Split signals B) Increase range by retransmission C) Convert
digital to analog D) Detect errors
ANSWER : B — It amplifies and rebroadcasts signals.
12.Duplex communication means:
A) One-way only B) Two-way simultaneously C) No communication
D) Repeat signals
ANSWER : B — Both can send and receive.
13.Simplex communication is:
A) Two-way B) One-way C) Half-duplex D) Error-corrected
ANSWER : B — Only one direction.
14.FCC stands for:
A) Federal Communications Commission B) Frequency Control Center
C) Forward Channel Control D) Fiber Communications Council
ANSWER : A — US regulator.
15.Wavelength is:
A) In meters B) In volts C) In seconds D) In amperes
ANSWER : A — Physical distance of one cycle.
16.Inverse relationship:
A) Frequency increases, wavelength increases B) Frequency increases,

, wavelength decreases C) Frequency decreases, power increases D)
Frequency decreases, noise decreases
ANSWER : B — Wavelength = speed/frequency.
17.What is demodulation?
A) Sending a signal B) Extracting original information C) Amplifying
D) Switching channels
ANSWER : B — Retrieve base message.
18.Interference is:
A) Desired signal B) Unwanted signal disrupting reception C) Power
measurement D) Channel capacity
ANSWER : B — Causes degradation.
19.Transceiver combines:
A) Transmitter and repeater B) Channel and receiver C) Transmitter
and receiver D) Modulator and filter
ANSWER : C — Single unit for both send/receive.
20.Antenna purpose is to:
A) Store energy B) Transmit/receive EM waves C) Modulate signals
D) Filter noise
ANSWER : B — Converts electrical ↔ waves.
21.Channel capacity is:
A) Maximum reliable data rate B) Noise level C) Frequency D)
Transmitter power
ANSWER : A — Max info per time.
22.Multipath propagation causes:
A) Clear reception B) Multiple signal paths C) No fading D) Infinite
bandwidth
ANSWER : B — Signals arrive via several paths.
23.Impedance matching is done to:
A) Reduce power B) Maximize power transfer C) Introduce noise
D) Change frequency
ANSWER : B — Match source & load.
24.SWR stands for:
A) Signal Wave Ratio B) Standing Wave Ratio C) Source Wave Rate
D) System Wave Resistance
ANSWER : B — Indicates matching quality.

, 25.Polarization describes:
A) Antenna size B) Orientation of EM wave’s electric field C) Noise
figure D) Sample rate
ANSWER : B — Vertical/horizontal orientation.
26.Throughput means:
A) Total bandwidth B) Data successfully transmitted C) Noise level
D) Signal type
ANSWER : B — Actual data rate achieved.
27.Filter in systems helps to:
A) Increase noise B) Allow certain frequencies C) Change voltage
D) Store charge
ANSWER : B — Block unwanted frequency ranges.
28.A periodic signal repeats:
A) Once B) Never C) Regularly in time D) Randomly
ANSWER : C — Repeats at fixed intervals.
29.Nyquist theorem says sampling must be:
A) Equal to highest freq B) Twice highest freq C) Half highest freq
D) Always analog
ANSWER : B — To avoid aliasing.
30.Aliasing occurs when sampling is:
A) Above Nyquist B) Below Nyquist C) Equal to zero D) Random
ANSWER : B — Causes distortion.
31.Digital systems are better because:
A) More noise susceptible B) Better noise immunity C) Infinite
bandwidth D) Only analog devices
ANSWER : B — Allows error correction.
32.Analog wired systems transmit:
A) Digital only B) Continuous signals C) Packets D) None
ANSWER : B — Continuous representation.
33.Fiber optic cable is typically used for:
A) Short noisy runs B) High-speed long distance C) Household AC
D) Antenna feed
ANSWER : B — High bandwidth, low loss.
34.Fourier Series decomposes:
A) Random noise B) Periodic signal into sinusoids C) Time delay