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Electronics and Communication Engineering
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Microwave Communication
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Question
In microwave circuits, a mode transducer is used to
Options
A. change mode of wave transmission
B. change direction of wave transmission
C. change polarization of wave transmission
D. change mode, direction or polarization wave transmission
Correct Answer
change mode, direction or polarization wave transmission
More questions
1. Inverters find applications in
Options
A. HVDC transmission
B. UPS
C. variable speed ac drives
D. all of the above
Show Answer
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Discuss
Correct Answer: all of the above
2. The
v
-
i
characteristics of a FET is shown in figure. In which region is the device biased for small signal amplification
Options
A. AB
B. BC
C. CD
D. BD
Show Answer
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Discuss
Correct Answer: BC
Explanation:
Small signal amplifier operation is in constant current region of characteristics.
3. A matched generator (Z
g
= Z
0
) with 1 ? available. If all ports are matched, the power delivered at ports 1, 2, 3 respectively are
Options
A. 0.5 W, 0.5 W, 0 W
B. 0 W, 0 W, 1 W
C. 0.33 W each
D. 0 W, 0.25 W, 0.25 W
Show Answer
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Discuss
Correct Answer: 0.5 W, 0.5 W, 0 W
Explanation:
Since all ports matched, input SWR = 1. No power is reflected and P
in
= P
4
= 1 W.
This power splits between ports 1 and 2. Therefore P
1
= P
2
= 0.5 ?, P
3
= 0.
4. ?
0
has no other physical meaning than that of a fundamental conversion factor.
Options
A. True
B. False
Show Answer
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Correct Answer: True
5. A wire is carrying current
I
. The field intensity H at a distance
r
from the wire
Options
A. is directed towards wire
B. is directed away from wire
C. is tangential every where to a circle of radius
r
D. none of the above
Show Answer
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Correct Answer: is tangential every where to a circle of radius
r
6. A few minutes disturbance in space communications occurs twice a year during Sunblinding when __________ are in line.
Options
A. Sun and satellite
B. Sun and Earth station
C. Satellite and Earth station
D. Sun, satellite and Earth station
Show Answer
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Correct Answer: Sun, satellite and Earth station
7. Which of the following is non-saturating?
Options
A. TTL
B. CMOS
C. ECL
D. Both (a) and (b)
Show Answer
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Correct Answer: ECL
Explanation:
Since it is non-saturating, ECL has low propagation delay.
8. The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier.
Options
A. True
B. False
Show Answer
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Correct Answer: False
Explanation:
Efficiency of full wave rectifier with centre tapped transformer is slightly higher than that of bridge rectifier.
9. When a ferromagnetic substance is magnetised there are small changes in dimensions. This phenomenon is called
Options
A. hysteresis
B. magnetostriction
C. diamagnetism
D. dipolar relaxation
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Correct Answer: magnetostriction
10. Selectivity varies with receiving frequency, frequency is raised.
Options
A. Somewhat better when the receiving frequency is raised
B. Somewhat better at intermediate frequency
C. Somewhat worse when the receiving frequency is lowered
D. Somewhat worse when the receiving frequency is raised
Show Answer
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Discuss
Correct Answer: Somewhat worse when the receiving frequency is raised
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