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Electronics and Communication Engineering
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Satellite Communication
Comments
Question
The present total cost per watt of power generation in geosynchronous orbit is nearly Rs.
Options
A. 20
B. 50
C. 100
D. 5
Correct Answer
20
Satellite Communication problems
Search Results
1. Radio broadcasting is a familiar example of
Options
A. space multiplexing
B. time multiplexing
C. frequency multiplexing
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: frequency multiplexing
2. India's first domestic geostationary satellite 1NSAT-IA was launched on 10th April 1982 from
Options
A. USSR
B. USA
C. UK
D. UP
Show Answer
Scratch Pad
Discuss
Correct Answer: USA
3. A geostationary satellite is one which
Options
A. hangs motionless in space about 36000 km about Earth
B. travels around the Earth in 24 hours
C. remains stationary above the Earth
D. appears stationary to everybody on Earth
Show Answer
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Discuss
Correct Answer: appears stationary to everybody on Earth
4. Rotation of a geosynchronous satellite means its
Options
A. drift from stationary position
B. wobbling
C. three-axis stabilization
D. three-dimensional stabilization
Show Answer
Scratch Pad
Discuss
Correct Answer: wobbling
5. Of the four INSAT-I satellites planned by India so for, only __________ has proved to be successful.
Options
A. INSAT-IA
B. INSAT-IB
C. INSAT-IC
D. INSAT-ID
Show Answer
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Discuss
Correct Answer: INSAT-IB
6. A function having frequency
f
is to be sampled. The sampling time T should be
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
Sampling frequency must be more than 2
f
. Therefore
.
7. Two function
g
1
(
t
) and
g
2
(
t
) with correlation of 6 has average power of 4 and 5 respectively. The power of
g
1
(
t
) +
g
2
(
t
) is
Options
A. 9
B. 21
C. 3
D. 15
Show Answer
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Discuss
Correct Answer: 21
Explanation:
Power of two correlated signal is P = P
1
+ P
2
+2R
1
,
2
(t).
8. If I (
s
)
, the final value of
i
(
t
) is
Options
A. 5A
B. 12.5 A
C. 0.05 A
D. 1250 A
Show Answer
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Discuss
Correct Answer: 12.5 A
Explanation:
9. The signal defined by the equations
f
(
t
) = 0 for
t
< 0,
f
(
t
) = E for 0 ?
t
?
a
and
f
(
t
) = 0 for
t
>
a
is
Options
A. a step function
B. a pulse function
C. a shifted step function originating at
t
=
a
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: a pulse function
Explanation:
It is a pulse lasting for
t
=
a
.
10. Let
x
(
t
) and
y
(
t
) with F.T.
x
(
f
) and
y
(
f
) respectively be related as shown in figure
Then
y
(
f
) is
Options
A.
B.
C. -X(
f
/2)
e
j2
p
f
D. -X(
f
/2)
e
- j2
p
f
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
By applying time shifting and scaling property.
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