1).
The frequency range of amplitude modulation is between _________
540-1600 Hz
940-1600 Hz
140-1600 Hz
240-1600 Hz
2). The amplitude modulation method was introduced in _____________
2000
2010
1980
1870
3). For a modulating signal ________ line is the reference line
Modulated peak
Peak
Carrier peak
None of the above
4). The circuit which is used to produce the amplitude modulation is __________
Modulator
Duplexer
Both a and b
None of the above
5). The overmodulation occurs when the modulating signal voltage is ______________ than the
carrier voltage
Greater
Less
Equal
None of the above
6). The amplitude modulation spectrum consists of _________ sideband frequencies and also
a carrier frequency
Upper
Lower
Both upper and lower
None of the above
7). The amplitude modulation categorized into _________
One
Two
Three
Four
8). The amplitude modulation used in _________
Digital communication
Telemetry
Analog communication
All of the above
9). Which modulation consists of both lower and upper sidebands?
DSB-SC
VSB
SSB-SC
None of the above
10). Which modulation consists of only upper or only lower sideband?
DSB-SC
VSB
SSB-SC
None of the above
11). The advantages of amplitude modulation are __________
Economical
Inexpensive
Simpler to implement
All of the above
12). Amplitude modulation is a type of ________ modulation
Carrier
Phase
Both a and b
None of the above
13). The amplitude modulation used in _________
TV pictures
Radio broadcasting
Facsimile transmission
All of the above
14). The bandwidth of amplitude modulation is ________
5 KHz
2 KHz
7 KHz
10 KHz
15). The standard value of intermediate frequency in amplitude modulation receivers is
_______
50 KHz
20 KHz
455 KHz
100 KHz
16). In amplitude modulation the amplitude ____________
Varies
Constant
Doesn't varies
None of the above
17). The frequency and phase of the carrier remains _______ in amplitude modulation
Varies
Constant
Doesn't varies
None of the above
18). Which one is a switching double sideband suppressed carrier modulator?
Ring modulator
Series bridge modulator
Shunt bridge modulator
All of the above
19). The polarity of binary input in QAM is ________
Polar
Unipolar
Bipolar
None of the above
20). What is the standard form of QAM?
Quality Amplitude Modulation
Quadrature Amplitude Modulation
Quadrature Analog Modulation
None of the above
21). _________ are the applications of quadrature amplitude modulation
Terrestrial digital TV broadcasting
Digital video broadcasting
Both a and b
None of the above
22). The quadrature amplitude modulation are ____________
Susceptible to noise
Only coherent detection is possible
It is using the linear amplifier which is having power wastage
All of the above
23). In quadrature amplitude modulation the messages are encoded into ________ of the
carrier
Amplitude
Phase
Frequency
Both a and b
24). The bandwidth of the amplitude signal is ___________ times the frequency of the
modulating signal
One
Two
Three
Four
25). The quadrature amplitude modulation constellations are __________ and they involve two
orthogonal basis signal
One dimensional
Two dimensional
Three dimensional
None of the above
26). Which one of the following is an analog modulation?
FM
FSK
ASK
None of the above
27). Which one of the following is a digital modulation?
QAM
QPSK
BPSK
None of the above
28). Which method is used in amplitude modulation signal demodulation?
Square law demodulation
Quadrature amplitude modulation
FM to AM conversion
Both a and b
29). Which one of the following is a basic technique of frequency modulation signal
demodulation?
Square law demodulation
Coherent demodulation
FM to AM conversion
Both a and b
30). _________ is also known as slope detection
Square law demodulation
Coherent demodulation
FM to AM conversion
Both a and b
31). In FM to AM conversion, the input of the frequency-modulated signal converted into
amplitude modulated signal by ____________
Integrator
Comparator
Differentiator
None of the above
32). The number of sidebands in amplitude modulation is _________
One
Two
Three
Four
33). ____________are the constant parameters in amplitude modulation
Frequency
Phase
Amplitude
Both a and b
34). _____________ are the constant parameters in frequency modulation
Frequency
Phase
Amplitude
Both b and c
35). The consumption of bandwidth in frequency modulation is _________
10 KHz
50 KHz
80 KHz
70 KHz
36). The consumption of bandwidth in frequency modulation is _________
10 KHz
30 KHz
80 KHz
70 KHz
37). What are the advantages of sideband modulation?
Bandwidth is less
Noise is less
Signal fading is less
All of the above
38). The standard form of SSB-SC is a _______ sideband suppressed carrier
Single
Simple
Suppressed
None of the above
39). The standard form of DSB-SC is _________ sideband suppressed carrier
Double
Differential
Double or Differential
None of the above
40). The superheterodyne receivers have better _________
Sensitivity
Selectivity
Both a and b
None of the above
41). The amplitude modulation spectrum ___________
Doesn’t consists of carrier
Consists of carrier
Used in electronic communication
Both b and c
Read more about Amplitude Modulation
42). The double sideband suppressed carrier demodulated using ________
High pass filter
Low pass filter
Both a and b
None of the above
43). The frequency modulated signal can be detected by using ________ filter and it is widely
used above ________ frequency
Bandpass, 10MHz
Bandpass, 20MHz
Bandpass, 30MHz
None of the above
44). The Hilbert transform is a ______ system
Linear
Non-linear
Both a and b
None of the above
45). The ________ is an amplitude modulation demodulation technique
Square law demodulator
Envelope detector
PLL detector
Both a and b
46). The ring modulator is a ________ modulator
Not a product
Product
Sum
None of the above
47). The maximum transmission efficiency of an amplitude modulation signal is _______
1%
5%
33.3%
3%
48). The quadrature amplitude modulation used in ____________
NTSC
PAL
Both a and b
None of the above
49). The generation of single sideband suppressed carrier signal is done by
__________discrimination methods
Phase
Frequency
Both a and b
None of the above
50). The costas receiver used for _____________
DSB-SC
SSB
Both a and b
None of the above
51). The square-law diode and switching modulations are examples of _________ modulation
Low level
High level
Both a and b
None of the above
52). The ring modulator consists __________ diodes
* One
* Two
* Three
* Four
53). The _____________ is also known as bandwidth conservation scheme
* Quadrature Amplitude Modulation
* Pulse Amplitude Modulation
* Both a and b
* None of the above
54). The VSB signals detected by ____________
* Low pass filter
* High pass filter
* Synchronous detection
* None of the above
55). The carrier signal is a __________ frequency signal in modulation techniques
* High
* Low
* Constant
* None of the above
56). In fading channels the performance of ___________ amplitude modulation systems is poor
* Single sideband
* Double sideband
* Both a and b
* None of the above
57). What is the standard form of FFSR?
* Fixed Forward Signal Regeneration
* Forward Fixed Signal Regeneration
* Feed Forward Signal Regeneration
* None of the above
58). In amplitude modulation systems the product detector is also known as ___________
* Integrator
* Comparator
* Differentiator
* None of the above
59). The video signals in TV are transmitted through _________ modulation
* Amplitude
* Phase
* Both a and b
* None of the above
60). In a communication system the redundancy is used to _______________
* Reduce efficiency
* Correct the errors
* Detect the errors
* All of the above
61). In frequency modulation receivers the impulse noise is reduced by __________
* Integrators
* Limiters
* Comparators
* None of the above
62). In ____________ , only one side band is present
* Conventional AM
* DSB-SC
* SSB-SC
* None of the above
63). The ratio of modulating signal voltage divided by carrier voltage is called _______
* Modulation index
* Amplitude modulation
* Phase modulation
* None of the above
64). The modulation can be done by ________ modulation
* Only frequency
* Only amplitude
* Both a and b
* None of the above
65). A demodulator separates ___________ signal from modulated signal
* Carrier
* Audio
* Either audio or carrier
* None of the above
66). The carrier waves are __________ waves
* Low-frequency
* High-frequency
* Either high or low
* None of the above
67). For TV transmission __________ propagation is used
* Line of sight
* Either a or b
* None of the above
68). For SW band radio transmission __________ propagation is used
* Line of sight
* Space wave
* Skywave
* None of the above
69). In grid modulator the efficiency and power output both are ________
* High
* Low
* Moderate
* None of the above
70). __________ are the terminals of triode
* Cathode
* Grid
* Plate
* All of the above
71). For grid and plate modulated ________ amplifier triode is used
* Class A
* Class B
* Class C
* None of the above
72). For satellite communication ___________ propagation is used
* Line of sight
* Space wave
* Skywave
* None of the above
73). For MW band radio transmission ___________ propagation is used
* Line of sight
* Space wave
* Skywave
* Ground wave
74). For collector modulator _______ amplifier is used
* Class A
* Class B
* Class C
* All of the above
75). The amplitude modulation requires __________
* Large bandwidth
* Large power
* Both a and b
* None of the above
76). In TV transmission the low level _________ is used
* IF modulation
* Phase modulation
* Both a and b
* None of the above
77). The amplitude modulation signal without a carrier is known as _____
* DSB-SC
* SSB-SC
* Both a and b
* None of the above
78). What is the standard form of VSB?
* Vertical Side Band
* Vestigial Signal Band
* Vestigial Side Band
* None of the above
79). The quadrature amplitude modulation is a combination of ___________ modulation
techniques
* AM and PM
* AM and QAM
* PM and QAM
* None of the above
80). The transmission techniques are categorized into ________
* One
* Two
* Three
* Four
81). The transmission efficiency of amplitude modulation is ___________
* High
* Very high
* Less
* None of the above
82). The transmission efficiency of double sideband suppressed carrier is ________
* Less
* Better than AM
* Lower than AM
* High
83). The transmission efficiency of a single sideband suppressed carrier is ________
* Less
* Better than AM
* Lower than AM
* Best
84). The number of modulating inputs in DSB-FC is _____________
* One
* Two
* Three
* Four
85). The number of modulating inputs in ISB is _____________
* One
* Two
* Three
* Four
86). The transmission efficiency of VSB is _______ than SSB
* Higher
* Lower
* Equal
* None of the above
87). The number of modulating inputs in DSB-SC is _____________
* One
* Two
* Three
* Four
88). The number of modulating inputs in VSB is _____________
* One
* Two
* Three
89). The number of modulating inputs in SSB is _____________
* One
* Two
* Three
* Four
90). In DSB-FC the power requirement to cover area is _________
* High
* Medium
* Very small
* Moderate
91). In DSB-SC the power requirement to cover area is _________
* High
* Medium
* Very small
* Moderate
92). In SSB the power requirement to cover area is _________
* High
* Medium
* Very small
* Moderate
93). In ISB the power requirement to cover area is _________
* High
* Medium
* Very small
* Moderate
94). In VSB the power requirement to cover area is _________
* High
* Medium
* Very small
* Moderate
95). In amplitude modulation, the bandwidth is _________ than frequency modulation
* Less
* Very high
* High
* Moderate
96). The amplitude receivers are _________
* Not immune to noise
* Immune to noise
* Receives amplitude modulation waves
* Both a and c
97). In ____________ carrier is removed
* Conventional AM
* DSB-SC
* SSB-SC
* None of the above
98). On the same frequency, the amplitude modulation is __________ to operate more channels
* Possible to operate only more channel
* Not possible to operate more channels
* Possible to operate only one channel
* None of the above
99). The wavelength of amplitude modulation is _____ than frequency modulation
* Higher
* Lower
* Equal
* None of the above
100). In ____________ amplitude signal contains carrier and two sidebands
Conventional AM
DSB-SC
SSB-SC
None of the above
