WorksheetsCommunication Shotgun
Total questions: 20
Worksheet time: 15mins
I am representing PM signal. am I True
True
May be
May not be
SPOT THE LIE IN FOLLOWING STATEMENTS
Integrator and Amplitude modulator gives FM wave
Integrator and Phase modulator gives FM wave
Differentiator and FM modulator gives PM wave
In NBFM beta is less than 1 radian.
Which 2 statements given below are true?
A super-heterodyne receiver has: frequency tuning, filtering and amplification.
A mixer and an oscillator combo is called heterodyning
A communication channel can carry only analog signals
The signal in real time as same as electrical signals.
Its an AM Radio
Its an FM Radio
Its a Radio
Its not an AM Radio, its a walkie-talkie
The higher modulating frequency is used in AM broadcast system is
10k
15k
5k
2M
Electronics communication was discovered in which century
16th
18th
19th
20th
The fourier transform of a signal x(t)=e^(-3t^2) is of the following form, where A and B are constants.
Ae^(-B|f|)
Ae^(-Bf)
Ae^(B|f|)
A+B(|f|)^2
A 1MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100per sec. Which of the following frequencies will not be present in the signal?
990khz
1010khz
1020khz
1030khz
Only one demodulator is capable of detecting this : x(t)= 5(1+2cos(2000*pi*t))*cos(2000*pi*t)
Envelope Detector
Square law detector
Synchronous Detector
NO it can not be done at all
v(t)=5[cos(10^6*pi*t)-sin(10^3*pi*t)*sin(10^6*pi*t)] whom do I resemble???
DSB-SC
AM
SSB-USB
NB-FM
The image channel rejection in a superheterodyne receiver comes from
IF Stage only
RF Stage only
Detector and RF Stage only
IF, RF and detector stages
Can we use varactor diode in generating:
FM signal
AM signal
NBFM
In India, the maximum frequency deviation in commercial FM broadcaasting signals is about
5KHz
15KHz
75KHz
200KHz
https://www.youtube.com/watch?v=aeJ55IySP_I
Can be used in PCM
Can be used in audio mixing
No where used
A pure AC signal is called a
Sine wave
Square wave
Rectangular wave
Random wave
An angle modulated signal is given by s(t)= cos(2π)(2×106t+30 sin(150t)+40cos(150t)) the maximum frequency deviation of s(t) is:
10.5kHz
6kHz
10kHz
7.5kHz
The spectral density of real valued random process has
Even symmetry
odd symmetry
Conjugate symmetry
No symmetry
A sinusoidal generator whose frequency is determined by the voltage applied to it from an external source
(a)
I am a backbone theorem for Digital Communication
(a)
Iam not the most abundantly used channel in communication system
water
Wire
OFC
