Communications - Online Test
Q1. 
In the following network, the switch is closed at t = 0- and the sampling starts from t = 0. The sampling frequency is 10 Hz.
The expression and the region of convergence of the z -transform of the sampled signal are
Answer : Option C
Explaination / Solution:
Q2. In ground wave propagation the earth
Answer : Option A
Explaination / Solution:
No Explaination.
Q3. Suppose that the modulating signal is 
and the carrier signal is 
, which one of the following is a conventional AM signal without over-modulation
and the carrier signal is , which one of the following is a conventional AM signal without over-modulation
Answer : Option C
Explaination / Solution:
No Explaination.
Q4. Ground wave propagation is used for
Answer : Option C
Explaination / Solution:
No Explaination.
Q5. Consider an angle modulated signal 
The average power of x(t) is
The average power of x(t) is
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. In sky wave propagation the ionosphere
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. If the scattering matrix [S ] of a two port network is 
then the network is
then the network is
Answer : Option C
Explaination / Solution:
Q8. Sky wave propagation is possible in the range from
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1Ω/m . If the line is distortion less, the attenuation constant(in Np/m) is
Answer : Option D
Explaination / Solution:
For distortion less transmission line characteristics impedance
Q10. Space wave propagation can be
Answer : Option A
Explaination / Solution:
No Explaination.
