Communications - Online Test
Q1. A white noise process X(t) with two-sided power spectral density 1 X 10-10 W/HZ is input to a filter whose magnitude squared response is shown below.
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. for a signal to be reproduced without distortion
Answer : Option A
Explaination / Solution:
No Explaination.
Q3. The signal 
is
is
Answer : Option C
Explaination / Solution:
No Explaination.
Q4. Audio signals have a maximum bandwidth of about
Answer : Option D
Explaination / Solution:
No Explaination.
Q5. A speed signal, band limited to 4 kHz and peak voltage varying between +5 V and -5 V, is sampled at the Nyquist rate. Each sample is quantized and represented by 8 bits.
If the bits 0 and 1 are transmitted using bipolar pulses, the minimum bandwidth required for distortion free transmission is
Answer : Option B
Explaination / Solution:
Q6. Coaxial cables have a bandwidth in the range of
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown ?
Answer : Option A
Explaination / Solution:
Rectangular and cylindrical waveguide doesn’t support TEM modes and have cut off frequency. Coaxial cable support TEM wave and doesn’t have cut off frequency.
Q8. Transmission bandwidth of fiber optic communication can be up to
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. 
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 samples x(n), n = (0, 1, 2, ...) are given by
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. To radiate signals with high efficiency, the antennas should have a size
Answer : Option A
Explaination / Solution:
No Explaination.
