Answer Posted / jyoti sheoran
MODULATION IS A SCHEME WHICH ALTERS SOME CHARACTERISTICS OF
THE HIGH FREQUENCY CARRIER IN ACCORDANCE WITH THE LOW
FREQUENCY MESSAGE SIGNAL CALLED THE MODULATING SIGNAL.
THERE ARE THREE TYPES OF MODULATION :-
1). AMPLITUDE MODULATION(AM) :-
IN THIS TYPE OF MODULATION
FREQUENCY AND PHASE REMAINS SAME, ONLY THE AMPLITUDE
CHANGES.
2). FREQUENCY MODULATION(FM) :-
IN FM THE PEAK AMPLITUDE
AND PHASE REMAINS CONSTANT BUT AS THE AMPLITUDE OF THE
INFORMATION CHANGES, THE FREQUENCY OF THE CARRIER CHANGES
CORRSEPONDINGLY.
3). PHASE MODULATION(PM) :-
PM IS USED IN THE SAME SYSTEM
AS AN ALTERNATIVE TO FREQUENCY MODULATION. IN PHASE
MODULATION, THE PHASE OF THE CARRIER SIGNAL IS MODULATED TO
FOLLOW THE CHANGING VOLTAGE LEVEL OF THE MODULATING SIGNAL.
NEED FOR MODULATION :-
1: EFFICIENT RADIATION
2: FREQUENCY TRANSLATION
3: MULTIPLEXING
4: REDUCTION OF NOISE
Is This Answer Correct ? | 7 Yes | 0 No |
Post New Answer View All Answers
what is the difference between earthing and unearth
list the advantages of RCCB over other circuit breakers?
What is main cause of cable's terminal point burned in Lug on high temperature although lug and cable selection is ok as per stantard and also tightness is ok as per situation. so please take in deep and tell correct answer thanku.
what is photo voltic cell,& what are the materials associated with that?and any spcifications like volts/cm etc?
how to store the thunder power?
How to minimize the eddy current losses?
I meggared my 2c*70 sq mm AL AR XLPE cable. its one end show 50 M ohm . is my cable is safe for laying. I have only one phase and neutral.
what is the electrical?
What is reactive power and where it is used.
sourse is 66 KV / 350 MVA, transfarmer is 1000 KVA 6.6 / 0.415 kv, iF fault is 28.75 MVA on 0.415 KV Bus then calculat the Transfarmer Impidance
Can I use distributon class/transmission class Lightning arresots for protecting the building? If not why please explain?
what are the installation procedure of high voltage power transformer,CT,CB&PT?
who can measure the size of power cable?
What happens if we connect a single phase energy meter in reverse polarity.
Why increase in current leads to increase in conductor temperature?