Discuss
menu
search
person
Login
Register
search
edit
Ask a Question
Discuss
All Activity
Q&A
Questions
Hot!
Unanswered
Tags
Ask a Question
What causes over modulation in am
Speak Question
asked
Jan 21, 2018
by
Shreya10
thumb_up_alt
3
like
thumb_down_alt
0
dislike
57
views
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1
Answer
Speak Answer
answered
Jan 21, 2018
by
anonymous
Excessive high voice signal may cause overmodulation.
Modulating component greater than carrier may cause overmodulation.
Setting the gain of the microphone too high may cause overmodulation.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
Please
log in
or
register
to add a comment.
← Prev Question
Next Question →
Related questions
asked
Apr 9, 2018
by
anonymous
If the radiated power of AM transmitter is 10 KW, the power in the carrier for modulation index of 0.6 is...
If the radiated power of AM transmitter is 10 KW, the power in the carrier for modulation index of 0.6 is nearly: (1) 8.24 KW (2) 9.26 KW (3) 8.47 KW (4) 9.6 KW
Last answer:
If the radiated power of AM transmitter is 10 KW, the power in the carrier for modulation index of 0.6 is nearly: 8.47 KW.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
137
views
1
answer
asked
Apr 9, 2018
by
anonymous
If modulation index is 0.6, maximum power efficiency (in %) of AM is about...
If modulation index is 0.6, maximum power efficiency (in %) of AM is about A) 60 B) 30 C) 20 D) 10
thumb_up_alt
0
like
thumb_down_alt
0
dislike
67
views
0
answers
asked
Jun 18, 2018
by
anonymous
The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at
The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is A) 50 W B) 66 W C) 68 W D) 70 W
Last answer:
The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is 66 W
total
power
am
transmitter
carrier
percentage
modulation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
83
views
1
answer
asked
May 12, 2018
by
anonymous
In amplitude modulation scheme, the over-modulation
In amplitude modulation scheme, the over-modulation (A) is desired phenomenon (B) helps in signal recovery (C) is undesired phenomenon (D) Envelope of AM maintains the shape of the baseband signal
Last answer:
In amplitude modulation scheme, the over-modulation is desired phenomenon
thumb_up_alt
0
like
thumb_down_alt
0
dislike
32
views
1
answer
asked
Apr 9, 2018
by
anonymous
One advantage of AM over suppressed carrier AM is...
One advantage of AM over suppressed carrier AM is A) Less power B) Less bandwidth C) Simpler detection D) Higher efficiency
thumb_up_alt
0
like
thumb_down_alt
0
dislike
32
views
0
answers
asked
5 days
ago
by
anonymous
What is the full form of ‘AM’ regarding radio broadcasting? (1) Amplitude Movement (2) Anywhere Movement (3) Amplitude Matching (4) Amplitude Modulation
What is the full form of ‘AM’ regarding radio broadcasting? (1) Amplitude Movement (2) Anywhere Movement (3) Amplitude Matching (4) Amplitude Modulation
Last answer:
Amplitude Modulation
physics
thumb_up_alt
0
like
thumb_down_alt
0
dislike
2
views
1
answer
asked
Aug 4, 2019
by
anonymous
i) State the significance of modulation index in AM transmission. ii) Explain the effect of modulation index on AM wave with waveforms.
i) State the significance of modulation index in AM transmission. ii) Explain the effect of modulation index on AM wave with waveforms.
Last answer:
Significance of modulation index in AM transmission It is used to determine the strength and quality of transmitted signal. If the modulation index is small, then the amount of variation in ... amplitude part of its information is lost in the process of modulation which is undesirable.
modulation
index
am
transmission
thumb_up_alt
0
like
thumb_down_alt
0
dislike
69
views
1
answer
asked
May 29, 2018
by
anonymous
In amplitude modulation AM, if modulation index is more than 100% then:
In amplitude modulation AM, if modulation index is more than 100% then: (1) Power of the wave increases. (2) Efficiency of transmission increases. (3) The wave gets distorted. (4) Bandwidth increases
Last answer:
In amplitude modulation AM, if modulation index is more than 100% then: The wave gets distorted.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
209
views
1
answer
asked
May 17, 2018
by
anonymous
The amplifiers following the modulated stage in a low level modulation AM system be
The amplifiers following the modulated stage in a low level modulation AM system be (A) linear amplifier (B) harmonic generators (C) class C power amplifiers (D) class untuned amplifiers
Last answer:
The amplifiers following the modulated stage in a low level modulation AM system be class C power amplifiers
thumb_up_alt
0
like
thumb_down_alt
0
dislike
54
views
1
answer
asked
Aug 3, 2019
by
anonymous
Compare AM with FM with respect to following points: a) Definition. b) Modulation index. c) Bandwidth. d) Side band.
Compare AM with FM with respect to following points: a) Definition. b) Modulation index. c) Bandwidth. d) Side band.
Last answer:
Parameters AM FM Definition It is the process in which the amplitude of carrier signal is varied in accordance with the instantaneous value of modulating signal keeping frequency and ... frequency deviation. Side band There are two sidebands Infinite number of sideband
am
fm
thumb_up_alt
0
like
thumb_down_alt
0
dislike
51
views
1
answer
asked
May 12, 2018
by
anonymous
If the carrier of a 100 percent modulation modulated AM wave is suppressed, the percentage
If the carrier of a 100 percent modulation modulated AM wave is suppressed, the percentage power saving will be (A) 50.55 (B) 15.55 (C) 10.66 (D) 66.66
Last answer:
If the carrier of a 100 percent modulation modulated AM wave is suppressed, the percentage power saving will be 66.66
thumb_up_alt
0
like
thumb_down_alt
0
dislike
114
views
1
answer
asked
Apr 14, 2018
by
anonymous
AM transmitter has a carrier power of 30 W. The percentage of modulation is 85%. Calculate the total power :
AM transmitter has a carrier power of 30 W. The percentage of modulation is 85%. Calculate the total power : (A) 5.4 W (B) 40.8 W (C) 10.8 W (D) 20.4 W
thumb_up_alt
0
like
thumb_down_alt
0
dislike
81
views
0
answers
asked
May 29, 2018
by
anonymous
Indicate which one of the following is NOT an advantage of FM over AM?
Indicate which one of the following is NOT an advantage of FM over AM? (1) Better noise immunity is provided (2) Lower bandwidth is required (3) The transmitted power is more useful (4) Less modulating power is required
Last answer:
Indicate which one of the following is NOT an advantage of FM over AM? (1) Better noise immunity is provided (2) Lower bandwidth is required (3) The transmitted power is more useful (4) Less modulating power is required
thumb_up_alt
0
like
thumb_down_alt
0
dislike
71
views
1
answer
asked
Mar 15, 2018
by
anonymous
What causes diodes to fail in alternator?
What causes diodes to fail in alternator?
causes
diodes
fail
alternator
thumb_up_alt
0
like
thumb_down_alt
0
dislike
61
views
0
answers
asked
Apr 9, 2018
by
anonymous
Which modulation scheme would you suggest for high speed data transmission over a fading channel?
Which modulation scheme would you suggest for high speed data transmission over a fading channel? A) MSK B) BPSK C) FSK D) OFDM
thumb_up_alt
0
like
thumb_down_alt
0
dislike
46
views
0
answers
asked
Mar 10, 2018
by
anonymous
Explain the significance of over modulation.
Explain the significance of over modulation.
significance
over
modulation
thumb_up_alt
0
like
thumb_down_alt
0
dislike
39
views
0
answers
asked
Mar 29, 2018
by
anonymous
In AM wave, useful power is carried by - - -
Last answer:
In AM wave, useful power is carried by Side bands
thumb_up_alt
0
like
thumb_down_alt
0
dislike
103
views
1
answer
asked
Apr 9, 2018
by
anonymous
Which one of the following statements is correct? Digital modulation techniques are used in satellite ...
Which one of the following statements is correct? Digital modulation techniques are used in satellite communication systems since: (1) They are easier to handle (2) Large bandwidth utilization is possible (3) They have a higher spectral efficiency (4) They are less prone to interference
Last answer:
They are less prone to interference
thumb_up_alt
0
like
thumb_down_alt
0
dislike
90
views
1
answer
asked
Apr 9, 2018
by
anonymous
In satellite communication, frequency modulation is used because satellite channel has...
In satellite communication, frequency modulation is used because satellite channel has a. High modulation index b. Small bandwidth and negligible noise c. Large bandwidth and severe noise d. Maximum bandwidth and minimum noise
thumb_up_alt
0
like
thumb_down_alt
0
dislike
89
views
0
answers
asked
May 2, 2020
by
anonymous
What do you mean by active filter? State its advantages over passive filter . Define pass band & stop band with respect to filter.
What do you mean by active filter? State its advantages over passive filter . Define pass band & stop band with respect to filter.
Last answer:
Active Filter: Active Filter is formed by using active element along with the passive components. Advantages of Active filter over Passive filter: High value of pass band gain can be obtained. It is ... pass band. Stop Band Filter: The frequency range which is attenuated is known as stop band.
active
filter
state
its
advantages
over
passive
define
pass
band
&
stop
with
respect
to
thumb_up_alt
0
like
thumb_down_alt
0
dislike
62
views
1
answer
asked
Sep 24, 2017
by
anonymous
What is the advantages of VLSI over discrete system?
Last answer:
VLSI is small and consume less power and its designing is easy.
vlsi
discrete
system
advantages
thumb_up_alt
0
like
thumb_down_alt
0
dislike
62
views
1
answer
asked
Apr 12, 2018
by
anonymous
For identical total transmitted power, the ratio of S/N for wide band FM to S/N of DSB-AM (with ma=1) is :
For identical total transmitted power, the ratio of S/N for wide band FM to S/N of DSB-AM (with ma=1) is : ( Given fm = 15 KHz & frequency. deviation =+/- 75 KHz) a. 112.5 b. 300 c. 75 d. 450
thumb_up_alt
0
like
thumb_down_alt
0
dislike
70
views
0
answers
asked
Apr 9, 2018
by
anonymous
AM transmitter operating below about 5 MHz usually make use of...
AM transmitter operating below about 5 MHz usually make use of A) Marconi antenna B) Turnstile antenna C) Hertz dipole D) Folded dipole
thumb_up_alt
0
like
thumb_down_alt
0
dislike
50
views
0
answers
asked
May 28, 2018
by
anonymous
An FM signal with modulation index mƒ is passed through a frequency tripler. The modulation index of the
An FM signal with modulation index mƒ is passed through a frequency tripler. The modulation index of the output signal will be (1) mƒ (2) 3mƒ (3) 9mƒ (4) 27mƒ
Last answer:
An FM signal with modulation index mƒ is passed through a frequency tripler. The modulation index of the output signal will be 3mƒ
thumb_up_alt
0
like
thumb_down_alt
0
dislike
111
views
1
answer
asked
May 17, 2018
by
anonymous
Amplitude modulation is used for broadcasting because
Amplitude modulation is used for broadcasting because (A) it is move noise immune than other modulation systems (B) compared with other systems it requires less transmitting power (C) its use avoids receiver complexity (D) no other modulation system can provide the necessary bandwidth for high fidelity.
Last answer:
Amplitude modulation is used for broadcasting because its use avoids receiver complexity
thumb_up_alt
0
like
thumb_down_alt
0
dislike
35
views
1
answer
asked
Apr 12, 2018
by
anonymous
The information rate to be transmitted is 900 bits /sec, FEC is 3/4 , the symbol rate for QPSK modulation...
The information rate to be transmitted is 900 bits /sec, FEC is 3/4 , the symbol rate for QPSK modulation scheme is : a. 225 symbols /sec b. 450 symbols /sec c. 600 symbols /sec d. 675 symbols /sec
thumb_up_alt
0
like
thumb_down_alt
0
dislike
66
views
0
answers
asked
Apr 12, 2018
by
anonymous
The maximum transmission power efficiency of DSB-C Amplitude modulation is :
The maximum transmission power efficiency of DSB-C Amplitude modulation is : a. 25% b. 33.33% c. 50% d. 100%
thumb_up_alt
0
like
thumb_down_alt
0
dislike
74
views
0
answers
asked
Apr 9, 2018
by
anonymous
The modulation system inherently most noise resistant is:
The modulation system inherently most noise resistant is: (1) Frequency modulation (2) Pulse width modulation (3) Pulse code modulation (4) Phase modulation
Last answer:
The modulation system inherently most noise resistant is: Pulse code modulation.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
64
views
1
answer
asked
Apr 9, 2018
by
anonymous
The modulation normally used with the digital data is ...
The modulation normally used with the digital data is a. PM b. AM c. SSB d. QPSK
thumb_up_alt
0
like
thumb_down_alt
0
dislike
131
views
0
answers
asked
Apr 9, 2018
by
anonymous
A carrier signal of 600 V rms with 75% amplitude modulation is applied to 75 ohm antenna. The total side...
A carrier signal of 600 V rms with 75% amplitude modulation is applied to 75 ohm antenna. The total side band power (in watts) is A) 4800 B) 450 C) 950 D) 1350
thumb_up_alt
0
like
thumb_down_alt
0
dislike
83
views
0
answers
asked
Mar 29, 2018
by
anonymous
Frequency modulation gives - - - noise
Last answer:
Frequency modulation gives Less noise
thumb_up_alt
0
like
thumb_down_alt
0
dislike
30
views
1
answer
asked
Jun 18, 2018
by
anonymous
As per Shannon’s channel capacity theorem, if samples are transmitted in ‘T’ seconds over a noisy channel
As per Shannon’s channel capacity theorem, if samples are transmitted in ‘T’ seconds over a noisy channel which is bandlimited to ‘B’ Hz. The number of samples ‘n’ is given by (symbols/notations carry their usual meaning) A) B/T B) T/B C) 2BT D) BT/2
Last answer:
As per Shannon’s channel capacity theorem, if samples are transmitted in ‘T’ seconds over a noisy channel which is bandlimited to ‘B’ Hz. The number of samples ‘n’ is given by ( ... /notations carry their usual meaning) A) B/T B) T/B C) 2BT D) BT/2
shannons
channel
capacity
theorem
transmitted
noisy
thumb_up_alt
0
like
thumb_down_alt
0
dislike
89
views
1
answer
asked
6 days
ago
by
anonymous
What is found in frequency modulation ? (1) Fixed frequency (2) Fixed dimension (3) Change in frequency and dimension (4) Change in dimension only
What is found in frequency modulation ? (1) Fixed frequency (2) Fixed dimension (3) Change in frequency and dimension (4) Change in dimension only
Last answer:
Fixed frequency
physics
thumb_up_alt
0
like
thumb_down_alt
0
dislike
3
views
1
answer
asked
Mar 19, 2018
by
anonymous
What is channel length modulation in MOSFET?
What is channel length modulation in MOSFET?
Last answer:
Shortening of lenght of the inverted channel region with increase in drain bias for large drain biases due to which current increases with drain bias and output resistance decreases is called channel length modulation in MOSFET.
channel
length
modulation
mosfet
thumb_up_alt
0
like
thumb_down_alt
0
dislike
245
views
2
answers
asked
Oct 2, 2018
by
anonymous
Name the process that causes potential difference across a solenoid due to the movement of a nearby magnet
thumb_up_alt
0
like
thumb_down_alt
0
dislike
370
views
0
answers
asked
Mar 28, 2018
by
anonymous
The skin effect causes current to flow
Last answer:
The skin effect causes current to flow Near the surface of the conductor
thumb_up_alt
0
like
thumb_down_alt
0
dislike
39
views
1
answer
asked
Mar 28, 2018
by
anonymous
Which type of fading causes serious distortion of modulated signal:
Last answer:
Which type of fading causes serious distortion of modulated signal: Selective fading.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
92
views
1
answer
asked
Jan 12
by
anonymous
Siva leaves chennai at 3 am and reaches Hyderabad at 11 am . Anirudh leaves Hyderabad at 5 am and reaches chennai at 12:00 noon. At what time do they cross each other? a) 7 : 52am b) 8 : 25am c) 6 : 52am d) 9 : 25am
Siva leaves chennai at 3 am and reaches Hyderabad at 11 am . Anirudh leaves Hyderabad at 5 am and reaches chennai at 12:00 noon. At what time do they cross each other? a) 7 : 52am b) 8 : 25am c) 6 : 52am d) 9 : 25am
Last answer:
C Time taken by Siva = 8 h Time taken by Anirudh = 7 h For your convenience take the product of times taken by both as a distance. Then the distance = 56km Since, Siva covers half of the distance in 2 ... by them = 28/15 = 1 hr 52 min Thus , they will cross each other at 6 : 52am.
time-speed-distance
thumb_up_alt
0
like
thumb_down_alt
0
dislike
6
views
1
answer
asked
Jan 10
by
anonymous
The distance between two stations ooty and chennai is 615km. A train with speed of 75 km/h leaves ooty at 8:00 am towards chennai. Another train with speed of 105 km/h leaves Chennai at 9 : 00 am towards ooty . Then, at what time both trains meet? A) 6 B) 12 C) 18 D) 24
The distance between two stations ooty and chennai is 615km. A train with speed of 75 km/h leaves ooty at 8:00 am towards chennai. Another train with speed of 105 km/h leaves Chennai at 9 : 00 am towards ooty . Then, at what time both trains meet? A) 6 B) 12 C) 18 D) 24
Last answer:
ANSWER:B Explanation: First train leaves at 8.00am and second leaves at 9.00am So,first train that is , from ooty to Chennai has covered 75 km distance in 1 hr. So , distance left by between the station = ... the trains will meet , 3 hr after second train left i.e., 9.00 am +3 = 12.00 pm
problems-on-train
thumb_up_alt
0
like
thumb_down_alt
0
dislike
5
views
1
answer
asked
Dec 26, 2019
by
anonymous
What is communication channel for am and fm broadcast
Last answer:
AM=Amplitude modulation and FM = Frequency modulation.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
99
views
1
answer
asked
Jul 21, 2019
by
anonymous
What are causes of faults in power system? State any four harmful effects of faults.
What are causes of faults in power system? State any four harmful effects of faults.
Last answer:
Causes of Faults in the Power System: 1) Breaking of Conductors: It is one of major causes of faults. Breaking of conductors is due to excessive heat or because of mechanical stresses ... maintenance of machines / equipment / lines / protective system leads to faults in the power system.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
61
views
2
answers
asked
Dec 5, 2018
by
Shaddy
What are the causes of accidents in a workshop?
Last answer:
Careless handling of machines
thumb_up_alt
0
like
thumb_down_alt
0
dislike
225
views
2
answers
asked
Apr 25, 2018
by
anonymous
What type of defect causes F -centers in a crystal ?
What type of defect causes F -centers in a crystal ? (a) Stoichiometric defect (b) Metal excess defect due to anion vacancies (c) Metal excess defect due to extra cations (d) Frenkel defect
Last answer:
Metal excess defect due to anion vacancies
thumb_up_alt
0
like
thumb_down_alt
0
dislike
54
views
1
answer
asked
Mar 10, 2018
by
anonymous
What causes lights to dim in house?
What causes lights to dim in house?
Last answer:
While taking a more load from other Equipment
causes
lights
dim
house
thumb_up_alt
0
like
thumb_down_alt
0
dislike
185
views
1
answer
asked
Oct 5, 2017
by
anonymous
what are the causes of noise in transformer?
Last answer:
Transformer noise is generated due to vibration of core and winding this is because of magnetostriction and magnetomotive force.
transformer
noise
causes
thumb_up_alt
3
like
thumb_down_alt
0
dislike
101
views
1
answer
asked
Jul 1, 2020
by
anonymous
Why silicon is preferred over Ge?
Why silicon is preferred over Ge?
Last answer:
1) Silicon is plenty available compared to Ge. 2) Extraction process of Si is easy and less expensive. 3) Si has more thermal stability as compared to Ge. 4) Si has more breakdown voltage as compared to Ge.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
115
views
1
answer
asked
Apr 9, 2018
by
anonymous
What is the maximum data rate that can be transmitted using a QPSK modulation with a roll-off factor of...
What is the maximum data rate that can be transmitted using a QPSK modulation with a roll-off factor of 0.2 for a 36 MHZ transponder? A) 7.2 Mbps B) 30 Mbps C) 43.2 Mbps D) 60 Mbps
thumb_up_alt
0
like
thumb_down_alt
0
dislike
76
views
0
answers
asked
Sep 18, 2017
by
anonymous
What is mean by pulse width modulation?
Last answer:
PWM means the width of pulse signal can be varied by varying ton & tOFF.
thumb_up_alt
0
like
thumb_down_alt
0
dislike
48
views
1
answer
asked
Jan 10
by
anonymous
The Cricketer average score in 40 over is 21, if the man scores 23runs in 8over, 26 runs in 10 over and 18runs in 14 over. What is the average score in remaining over? A) 18 B) 19 C) 16 D) 20
The Cricketer average score in 40 over is 21, if the man scores 23runs in 8over, 26 runs in 10 over and 18runs in 14 over. What is the average score in remaining over? A) 18 B) 19 C) 16 D) 20
Last answer:
A) According to the question 40*21=23*8+26*10+18*14+8×X 840=184+260+252+8x 8x=144 X=144/8=18 runs
average
thumb_up_alt
0
like
thumb_down_alt
0
dislike
6
views
1
answer
asked
Jan 13
by
anonymous
A 400 W carrier is amplitude modulated to a depth of 75%.Calculate the total power in AM wave. (i) Explain the types of noise in a communication system. (ii) Compare simplex and duplex mode of communication.
A 400 W carrier is amplitude modulated to a depth of 75%.Calculate the total power in AM wave. (i) Explain the types of noise in a communication system. (ii) Compare simplex and duplex mode of communication.
Last answer:
(i) Noise: Noise is any spurious or undesired disturbances that mask the received signal in a communication system. a) Atmospheric Noise: Atmospheric Noise is also known as static noise which is the ... remote control ExamplesWalkytalky,telephone,mobile,Radar, FAX,Pager 4
principles-of-electronic-communication
thumb_up_alt
0
like
thumb_down_alt
0
dislike
5
views
1
answer
...