Communication Systems - Online Test
Q1. Bandwidth of an electronic communication system
Answer : Option C
Explaination / Solution:
A range within a band of wavelengths, frequencies, or energies; especially : a range of radio frequencies which is occupied by a modulated carrier wave, which is assigned to a service, or over which a device can operate.
Q2. Modulation is
Answer : Option B
Explaination / Solution:
Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted. Most radio systems uses frequency modulation (FM) or amplitude modulation (AM) to make the carrier carry the radio broadcast.
Q3. Modulation used in radio is generally
Answer : Option A
Explaination / Solution:
In electronics and telecommunications , modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted. Most radio systems usea frequency modulation (FM) or amplitude modulation (AM) to make the carrier carry the radio broadcast.
Q4. Demodulation is
Answer : Option C
Explaination / Solution:
Demodulation is extracting the original information-bearing signal from a modulated carrier wave. A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave.
Q5. Repeater is used for
Answer : Option B
Explaination / Solution:
In telecommunications, a repeater is an electronic device that receives a signal and retransmits it.Repeaters are used to extend transmissions so that the signal can cover longer distances or be received on the other side of an obstruction.
Q6. Repeaters used in electronic communication generally
Answer : Option A
Explaination / Solution:
In telecommunications, a repeater is an electronic device that receives a signal and retransmits it.Repeaters are used to extend transmissions so that the signal can cover longer distances or be received on the other side of an obstruction.A repeater is a combinatin of a transmitter,an amplifier and retransmits it to the receiver somtimes witha a change of carrier frequency.
Q7. Fourier analysis of a periodic signal implies
Answer : Option A
Explaination / Solution:
The concept is that there are two descriptions of a signal according to Fourier. The time domain in form of time waveform and the frequency domain form in form of a combination of complex periodic signal with frequency as a variable instead of t. Hence Fourier analysis of a periodic signal implies periodic signal can be regarded as a superposition of sine wave signals
Q8. Fourier series of a repeating sine wave has a
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. Fourier series of a periodic rectangular pulse has a
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. Fourier series of a periodic rectangular wave has a
Answer : Option B
Explaination / Solution:
No Explaination.
