HTML
   HTML5
   CSS
   CSS3
   JavaScript
   jQuery
   AngularJS
   Articles
   Tech Articles
   Blog
Google News
logo
Aeronautical & Aerospace Engineering : Avionics - Quiz(MCQ)
Which of the following is an advantage of SSB over DSB?
A)
Carrier is suppressed
B)
Reduce in spectrum space
C)
No change in spectrum space
D)
Power is not wasted on the carrier

Correct Answer :   Reduce in spectrum space

Explanation : In a signal, only the sidebands contain the information. Also, there is a duplication of the information in each sideband. Thus one sideband is sufficient form transmission as compared to DSB where both the sidebands are present. Since one of the sideband is also suppressed it reduces the maximum or the minimum frequency of the signal and hence the spectrum space is reduced in an SSB.

Recently Updated in Avionics Questions
Which of the following is true with respect to the bandwidth of a 2kHz audio signal and a 2kHz binary data?
A)
Bandwidth is higher for binary data than audio signals
B)
Bandwidth is higher for audio signals than binary data
C)
Bandwidth remains the same for both
D)
Bandwidth keeps increasing with time for the binary data

Correct Answer : Option (A) :   Bandwidth is higher for binary data than audio signals

Explanation : Since binary data is transmitted in square waves or pulses, they are generally made up of numerous fundamental sine waves. This occupies a huge bandwidth as compared to audio signals which are analog in nature and usually comprise of a lesser number of sine waves.

What is the signal to noise ratio if the maximum allowable frequency deviation is 4kHz and the frequency deviation by noise is 156.42Hz?
A)
0.0364
B)
0.0391
C)
20.45
D)
25.75

Correct Answer : Option (D) :   25.75

Explaination : N/S = Frequency deviation by noise / maximum deviation = 156.42/4000 =0.0391
S/N = (N/S)-1=25.57.

Calculate the phase difference by noise if the Signal to noise ratio is 7:2.
A)
8.21°
B)
13.65°
C)
15.366°
D)
17.5°

Correct Answer : Option (C) :   15.366°

Explanation : ?=sin-1(N/S)=sin-1(2/7)=sin-1(0.265)=15.366°.

Advertisement