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Code No: 55024 Set No. 1
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD III B.Tech.
I Sem., I Mid-Term Examinations, Aug/Sept 2013
ANALOG COMMUNICATIONS Objective Exam
Name: ______________________________ Hall Ticket No.
Answer All Questions. All Questions Carry Equal Marks.Time: 20
Min. Marks: 10. I Choose the correct alternative: 1. The modulation
index of an AM wave is changed from 0 to1 the transmitted power is
[ ]
a) Unchanged b) Halved c) Doubled d) increased by 50% 2. What is
the difference between a balanced modulator and a regular
modulator? [ ]
a) There is no carrier produced in the output of a balanced
modulator. b) In a balanced modulator, there is 180 phase shift
between the upper and lower sidebands. c) In a balanced modulator,
only one sideband is produced. d) In a balanced modulator,
harmonics of the sidebands are suppressed.
3. Which of the following analog modulation scheme requires the
minimum transmitted power
and minimum channel bandwidth [ ] a) VSB b) DSB-SC c) SSB d)
AM
4. An AM radio station using double side band transmitted
carrier system employs a carrier of
frequency 1.2 MHz. If the modulating signal frequency is 2 kHz,
the frequencies present in the modulated carrier are [ ] a) 1.2 MHz
and 1.4 MHz b) 1 MHz, 1.2 MHz and 1.4 MHz c) 1.198 MHz, 1.2 MHz and
1.202 MHz d) 1.198 MHz and 1.202 MHz
5. The modulation index of over modulated wave is [ ]
a) 1 c) Infinity d) 1 6. The AM broad cast band is given by [
]
a) 10-30 kHz b) 500-1500 kHz c) 3-30MHz d) none
7. =SCDSBtV )( [ ]
a) ])cos()[cos(
2ttVV mcmccm ++
b) ])cos()[cos(
2ttVV mcmccm ++
c) ])cos()[cos(
2ttVV mcmccm +++
d) ])cos()[cos(
2ttVV mcmccm +
8. Which of the following is not an advantage of the phase
method over the filter method in producing
SSB? [ ] a) The design of the 90 phase-shift network for the
intelligence frequencies is simple. b) Lower intelligence
frequencies can be economically used, because a high-Q filter is
not necessary. c) Intermediate balanced modulators are not
necessary, because high-Q filters are not needed. d) It is easier
to switch from one sideband to the other.
Cont..2
A
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Code No: 55024 :2: Set No. 1 9. The most suitable method for
detecting a modulated signal (2.5+5coswmt)coswct is [ ]
a) envelope detector b) synchronous detector c) ratio detector
d) Both a&b 10. The amount of frequency increase and decrease
around the center frequency in an FM signal is
called the [ ] a) Index of modulation b) Frequency deviation c)
Phase deviation d) Bandwidth of the FM signal
II Fill in the blanks 11. The multiplication of f(t) (the base
band signal) with a periodic square wave p(t) generates ___________
12. In _________________ transmission, the carrier signal is
modulated so that its amplitude varies with the
changing amplitudes of the modulating signal. 13. An FM signal
has an intelligence frequency of 5 kHz and a maximum deviation of
25 kHz. Its index of
modulation is ______________ 14. Band width of FM signal is
______________ 15. The maximum amplitude of an amplitude modulated
wave is 12 V and the minimum amplitude is 4V.
The modulation percentage is ______________ 16. VSB is most
widely used in ______________application 17. FM broad cast band
lies in ______________ 18. In AM modulation, when the modulation
index increases, transmitted power is ______________ 19. In FM
modulation, when the modulation index increases, transmitted power
is ______________ 20. Band width of VSB Modulated signal is
______________
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Code No: 55024 Set No. 2
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD III B.Tech.
I Sem., I Mid-Term Examinations, Aug/Sept 2013
ANALOG COMMUNICATIONS Objective Exam
Name: ______________________________ Hall Ticket No.
Answer All Questions. All Questions Carry Equal Marks.Time: 20
Min. Marks: 10. I Choose the correct alternative: 1. An AM radio
station using double side band transmitted carrier system employs a
carrier of
frequency 1.2 MHz. If the modulating signal frequency is 2 kHz,
the frequencies present in the modulated carrier are [ ] a) 1.2 MHz
and 1.4 MHz b) 1 MHz, 1.2 MHz and 1.4 MHz c) 1.198 MHz, 1.2 MHz and
1.202 MHz d) 1.198 MHz and 1.202 MHz
2. The modulation index of over modulated wave is [ ]
a) 1 c) Infinity d) 1 3. The AM broad cast band is given by [
]
a) 10-30 kHz b) 500-1500 kHz c) 3-30MHz d) none
4. =SCDSBtV )( [ ]
a) ])cos()[cos(
2ttVV mcmccm ++
b) ])cos()[cos(
2ttVV mcmccm ++
c) ])cos()[cos(
2ttVV mcmccm +++
d) ])cos()[cos(
2ttVV mcmccm +
5. Which of the following is not an advantage of the phase
method over the filter method in producing
SSB? [ ] a) The design of the 90 phase-shift network for the
intelligence frequencies is simple. b) Lower intelligence
frequencies can be economically used, because a high-Q filter is
not necessary. c) Intermediate balanced modulators are not
necessary, because high-Q filters are not needed. d) It is easier
to switch from one sideband to the other.
6. The most suitable method for detecting a modulated signal
(2.5+5coswmt)coswct is [ ]
a) envelope detector b) synchronous detector c) ratio detector
d) Both a&b 7. The amount of frequency increase and decrease
around the center frequency in an FM signal is
called the [ ] a) Index of modulation b) Frequency deviation c)
Phase deviation d) Bandwidth of the FM signal
8. The modulation index of an AM wave is changed from 0 to1 the
transmitted power is [ ]
a) Unchanged b) Halved c) Doubled d) increased by 50%
Cont..2
A
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Code No: 55024 :2: Set No. 2 9. What is the difference between a
balanced modulator and a regular modulator? [ ]
a) There is no carrier produced in the output of a balanced
modulator. b) In a balanced modulator, there is 180 phase shift
between the upper and lower sidebands. c) In a balanced modulator,
only one sideband is produced. d) In a balanced modulator,
harmonics of the sidebands are suppressed.
10. Which of the following analog modulation scheme requires the
minimum transmitted power
and minimum channel bandwidth [ ] a) VSB b) DSB-SC c) SSB d)
AM
II Fill in the blanks 11. Band width of FM signal is
______________ 12. The maximum amplitude of an amplitude modulated
wave is 12 V and the minimum amplitude is 4V.
The modulation percentage is ______________ 13. VSB is most
widely used in ______________application 14. FM broad cast band
lies in ______________ 15. In AM modulation, when the modulation
index increases, transmitted power is ______________ 16. In FM
modulation, when the modulation index increases, transmitted power
is ______________ 17. Band width of VSB Modulated signal is
______________ 18. The multiplication of f(t) (the base band
signal) with a periodic square wave p(t) generates ___________ 19.
In _________________ transmission, the carrier signal is modulated
so that its amplitude varies with the
changing amplitudes of the modulating signal. 20. An FM signal
has an intelligence frequency of 5 kHz and a maximum deviation of
25 kHz. Its index of
modulation is ______________
-o0o-
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Code No: 55024 Set No. 3
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD III B.Tech.
I Sem., I Mid-Term Examinations, Aug/Sept 2013
ANALOG COMMUNICATIONS Objective Exam
Name: ______________________________ Hall Ticket No.
Answer All Questions. All Questions Carry Equal Marks.Time: 20
Min. Marks: 10. I Choose the correct alternative: 1. The AM broad
cast band is given by [ ]
a) 10-30 kHz b) 500-1500 kHz c) 3-30MHz d) none
2. =SCDSBtV )( [ ]
a) ])cos()[cos(
2ttVV mcmccm ++
b) ])cos()[cos(
2ttVV mcmccm ++
c) ])cos()[cos(
2ttVV mcmccm +++
d) ])cos()[cos(
2ttVV mcmccm +
3. Which of the following is not an advantage of the phase
method over the filter method in producing
SSB? [ ] a) The design of the 90 phase-shift network for the
intelligence frequencies is simple. b) Lower intelligence
frequencies can be economically used, because a high-Q filter is
not necessary. c) Intermediate balanced modulators are not
necessary, because high-Q filters are not needed. d) It is easier
to switch from one sideband to the other.
4. The most suitable method for detecting a modulated signal
(2.5+5coswmt)coswct is [ ]
a) envelope detector b) synchronous detector c) ratio detector
d) Both a&b 5. The amount of frequency increase and decrease
around the center frequency in an FM signal is
called the [ ] a) Index of modulation b) Frequency deviation c)
Phase deviation d) Bandwidth of the FM signal
6. The modulation index of an AM wave is changed from 0 to1 the
transmitted power is [ ]
a) Unchanged b) Halved c) Doubled d) increased by 50% 7. What is
the difference between a balanced modulator and a regular
modulator? [ ]
a) There is no carrier produced in the output of a balanced
modulator. b) In a balanced modulator, there is 180 phase shift
between the upper and lower sidebands. c) In a balanced modulator,
only one sideband is produced. d) In a balanced modulator,
harmonics of the sidebands are suppressed.
8. Which of the following analog modulation scheme requires the
minimum transmitted power
and minimum channel bandwidth [ ] a) VSB b) DSB-SC c) SSB d)
AM
Cont..2
A
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Code No: 55024 :2: Set No. 3 9. An AM radio station using double
side band transmitted carrier system employs a carrier of
frequency 1.2 MHz. If the modulating signal frequency is 2 kHz,
the frequencies present in the modulated carrier are [ ] a) 1.2 MHz
and 1.4 MHz b) 1 MHz, 1.2 MHz and 1.4 MHz c) 1.198 MHz, 1.2 MHz and
1.202 MHz d) 1.198 MHz and 1.202 MHz
10. The modulation index of over modulated wave is [ ]
a) 1 c) Infinity d) 1 II Fill in the blanks 11. VSB is most
widely used in ______________application 12. FM broad cast band
lies in ______________ 13. In AM modulation, when the modulation
index increases, transmitted power is ______________ 14. In FM
modulation, when the modulation index increases, transmitted power
is ______________ 15. Band width of VSB Modulated signal is
______________ 16. The multiplication of f(t) (the base band
signal) with a periodic square wave p(t) generates ___________ 17.
In _________________ transmission, the carrier signal is modulated
so that its amplitude varies with the
changing amplitudes of the modulating signal. 18. An FM signal
has an intelligence frequency of 5 kHz and a maximum deviation of
25 kHz. Its index of
modulation is ______________ 19. Band width of FM signal is
______________ 20. The maximum amplitude of an amplitude modulated
wave is 12 V and the minimum amplitude is 4V.
The modulation percentage is ______________
-o0o-
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Code No: 55024 Set No. 4
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD III B.Tech.
I Sem., I Mid-Term Examinations, Aug/Sept 2013
ANALOG COMMUNICATIONS Objective Exam
Name: ______________________________ Hall Ticket No.
Answer All Questions. All Questions Carry Equal Marks.Time: 20
Min. Marks: 10. I Choose the correct alternative: 1. Which of the
following is not an advantage of the phase method over the filter
method in producing
SSB? [ ] a) The design of the 90 phase-shift network for the
intelligence frequencies is simple. b) Lower intelligence
frequencies can be economically used, because a high-Q filter is
not necessary. c) Intermediate balanced modulators are not
necessary, because high-Q filters are not needed. d) It is easier
to switch from one sideband to the other.
2. The most suitable method for detecting a modulated signal
(2.5+5coswmt)coswct is [ ]
a) envelope detector b) synchronous detector c) ratio detector
d) Both a&b 3. The amount of frequency increase and decrease
around the center frequency in an FM signal is
called the [ ] a) Index of modulation b) Frequency deviation c)
Phase deviation d) Bandwidth of the FM signal
4. The modulation index of an AM wave is changed from 0 to1 the
transmitted power is [ ]
a) Unchanged b) Halved c) Doubled d) increased by 50% 5. What is
the difference between a balanced modulator and a regular
modulator? [ ]
a) There is no carrier produced in the output of a balanced
modulator. b) In a balanced modulator, there is 180 phase shift
between the upper and lower sidebands. c) In a balanced modulator,
only one sideband is produced. d) In a balanced modulator,
harmonics of the sidebands are suppressed.
6. Which of the following analog modulation scheme requires the
minimum transmitted power
and minimum channel bandwidth [ ] a) VSB b) DSB-SC c) SSB d)
AM
7. An AM radio station using double side band transmitted
carrier system employs a carrier of
frequency 1.2 MHz. If the modulating signal frequency is 2 kHz,
the frequencies present in the modulated carrier are [ ] a) 1.2 MHz
and 1.4 MHz b) 1 MHz, 1.2 MHz and 1.4 MHz c) 1.198 MHz, 1.2 MHz and
1.202 MHz d) 1.198 MHz and 1.202 MHz
8. The modulation index of over modulated wave is [ ]
a) 1 c) Infinity d) 1 9. The AM broad cast band is given by [
]
a) 10-30 kHz b) 500-1500 kHz c) 3-30MHz d) none
Cont..2
A
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Code No: 55024 :2: Set No. 4 10. =SCDSBtV )( [ ]
a) ])cos()[cos(
2ttVV mcmccm ++
b) ])cos()[cos(
2ttVV mcmccm ++
c) ])cos()[cos(
2ttVV mcmccm +++
d) ])cos()[cos(
2ttVV mcmccm +
II Fill in the blanks 11. In AM modulation, when the modulation
index increases, transmitted power is ______________ 12. In FM
modulation, when the modulation index increases, transmitted power
is ______________ 13. Band width of VSB Modulated signal is
______________ 14. The multiplication of f(t) (the base band
signal) with a periodic square wave p(t) generates ___________ 15.
In _________________ transmission, the carrier signal is modulated
so that its amplitude varies with the
changing amplitudes of the modulating signal. 16. An FM signal
has an intelligence frequency of 5 kHz and a maximum deviation of
25 kHz. Its index of
modulation is ______________ 17. Band width of FM signal is
______________ 18. The maximum amplitude of an amplitude modulated
wave is 12 V and the minimum amplitude is 4V.
The modulation percentage is ______________ 19. VSB is most
widely used in ______________application 20. FM broad cast band
lies in ______________
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