Communication 1
Communication Fundamentals Quiz
Test your knowledge on the fundamentals of communication systems with our engaging quiz. This quiz covers a range of topics including modulation techniques, signal processing, and more!
- 30 multiple-choice questions
- Great for students and professionals alike
- Assess your understanding and improve your skills
Human voice is converted into electrical waveform by ......
Transducer
Multiplexer
Modulator
Quantizer
Modifies the baseband signal for efficient transmission.
Transducer
Amplifier
Transmitter
Channel
Modulation refers to a low-frequency signal controlling the ......
Amplitude of the carrier
Frequency of the carrier
Phase of the carrier
May be any of these
Input signal for communication is known as ...... signal.
Baseband
Communication
Broadband
Analogue
In communication systems, transmitter output is sent using ......
Modulator
Amplifiers
Channels
All
The power ratio between a signal and the noise is called ......
Signal gain
Amplification
Attenuation
SNR
According to Fourier analysis, square wave can be represented as
Fundamental sine wave and even harmonics
Fundamental sine wave and odd harmonics
Fundamental sine wave and harmonics
Fundamental and sub harmonic sine wave
Demodulation is done in ......
Transmitter
Receiver
Channel
Receiving antenna
Modulation is required for
Reducing noise while transmission
Multiplexing the signals
Reduction of Antenna height
All of these
The process of recovering information signal from received carrier is known as
Detection
Demodulation
Demultiplexing
Fidelity
By increasing the signal power, ...... Of signal increases
Quality
Noise
Attenuation
All of these
Ring modulator ......
Is used for DSB-SC generation
Consists of four diodes connected in the form of ring
Is a product modulator
All of these
Analog signal may be converted into digital signal by ......
Sampling
Amplitude modulation
Filtering
Digital modulation
The value of power gain in decibels if Pout = 250W and Pin = 100W is
2.48 dB
3.98 dB
1.78 dB
3.54 dB
Advantages of digital communication over analog communication are:
Less complex
Higher security
Immunity to noise
Higher security & Immunity to noise
The simplex system is a ...... system.
Unidirectional communication
Bidirectional communication
Multidirectional communication
Bidirectional communication & Multidirectional communication
For efficient transmission, the radiation antenna should an order of ...... Or more of the wavelength of signal radiated
One Tenth
Double
Equal
One sixth
FM signal is better than AM signal because ......
Better noise immunity
Less channel bandwidth is required
Simple detection circuit required
Less transmitted power required
Overmodulation occurs when signal amplitude is ...... carrier
Equal to
Greater than
Less than
Less than or equal to
Narrow band FM has the characteristics:
The frequency sensitivity kf is small
Bandwidth is narrow
The frequency sensitivity kf is small & Bandwidth is narrow
None of these
The modulation technique that uses the minimum channel bandwidth is
FM
DSB-SC
VSB
SSB
The ratio of maximum frequency deviation and the maximum modulating signal frequency is termed as ......
Frequency deviation
Deviation ratio
Signal to noise ratio
Frequency spectrum
The increase or decrease in the frequency around the carrier frequency is termed as ......
Figure factor
Frequency deviation
Modulation index
Frequency spectrum
The equation v(t) = A cos [ωct + kp m(t)] represents the ......
PM signal
DSB-SC signal
SSB-SC signal
FM signal
What is the change in the bandwidth of the signal in FM when the modulating frequency increases from 12 kHz to 24 kHz?
40 kHz
58 kHz
24 kHz
No change
Determine the bandwidth of an FM wave when the maximum frequency deviation allowed is 75 kHz and the modulating signal has a frequency of 10 kHz.
170 kHz
200 kHz
100 kHz
1000 kHz
Find the Fourier transform of an exponential signal The Fourier transform of 𝑔(𝑡) = 𝑒^(−𝑎𝑡) 𝑢(𝑡), a > 0.
1/(𝑎 + 𝑗𝜔)
1/(𝑎 − 𝑗𝜔)
1/(−𝑎 + 𝑗𝜔)
1/(𝑎 + 𝜔)
If 𝝺(𝜔) is the Fourier transform of 𝑔(𝑡), then the Fourier transform of 𝑔(𝑡 − 𝑎) is ......
Н��(𝜔) 𝑒^(−𝜔𝑎)
Н��(𝜔 − 𝑎) 𝑒^(−𝑗𝜔𝑎)
Н��(𝜔 − 𝑎)
Н��(𝜔) 𝑒^(−𝑗𝜔𝑎)
You are asked to design a mixer to translate the modulated signal 𝑚(𝑡) cos 2000𝜋𝑡 to 𝑚(𝑡) cos 1600𝜋𝑡. The value of 𝑓𝑖 in figure shown is ......
800 Hz
600 Hz
1800 Hz
1600 Hz
The type of filter in previous figure is
LPF
BPF
HPF
BSF
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