Communications - Online Test
Q1. Electronic communication refers to
Answer : Option B
Explaination / Solution:
When information are sent from one point to the other it has to be converted into electrical signal using transducer.The receiver receives it in its original from using receiver.Such from of communication is called electronic communication.
Q2. If R(τ) is the auto correlation function of a real, wide-sense stationary random process, then which of the following is NOT true
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. The three elements of a generalized communication system are
Answer : Option A
Explaination / Solution:
In communication the Transmitter helps in transmitting the signal through communication channel which acts as a physical path that connects transmitter to a receiver.And the receiver receives the transmitted signal and converts those signals in their original form.
Q4. If S(f) is the power spectral density of a real, wide-sense stationary random process, then which of the following is ALWAYS true?
Answer : Option B
Explaination / Solution:
No Explaination.
Q5. In delta modulation, the slope overload distortion can be reduced by
Answer : Option D
Explaination / Solution:
No Explaination.
Q6. Electronic communication is not possible if
Answer : Option A
Explaination / Solution:
As the information or message is transmitted from the source to the receiver ,it is first converted into electrical signal which is then transmiited through the communication medium.Hence in electrical communication it is must to convert raw message or information into electrical signal.Else the electronic messages will not be transmitted.
Q7. The raised cosine pulse p(t) is used for zero ISI in digital communications. The
expression for p(t) with unity roll-off factor is given by
The value of p(t) at t = 1/W is
Answer : Option C
Explaination / Solution:
Q8. Which of these is an example of point to point communication?
Answer : Option C
Explaination / Solution:
In point to point communication,communication occurs over a link between a single transmitter and receiver.Telephony is an example of it as it needs a link between caller and receiver to transmit the information.This link is provided by various media like cable.
Q9. 
In the following scheme, if the spectrum M(f) of m(t) is as shown, then the spectrum Y(f) of y(t) will be
Answer : Option B
Explaination / Solution:
Q10. Which of these is an example of broadcast communication?
Answer : Option C
Explaination / Solution:
In broadcast mode of communication a large number of receivers are linked to a single transmiiter.Radio works as receiver which converts the transmiited information/message into the original form of the information.
