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Electronics and Communication Engineering
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Microwave Communication
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Question
Frequency range for satellite communication is
Options
A. 1 kHz to 100 kHz
B. 100 kHz to 10 MHz
C. 10 MHz to 100 MHz
D. 1 GHz to 30 GHz
Correct Answer
1 GHz to 30 GHz
More questions
1. A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is
Options
A. 25 ?
B. 50 ?
C. 225 ?
D. 250 ?
Show Answer
Scratch Pad
Discuss
Correct Answer: 225 ?
Explanation:
r
v
and VSWR
.
2. Frequency shift keying is used mostly in
Options
A. telegraphy
B. telephony
C. satellite communication
D. radio transmission
Show Answer
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Discuss
Correct Answer: telegraphy
Explanation:
Frequency shift keying (FSK) is a system of frequency modulation used in telegraphy.
3. If ?
r
= ?
r
'
-
j
?
r
"
tan ? =
.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
4. Which of the following has the highest input impedance?
Options
A. CE
B. CB
C. CC
D. Push pull
Show Answer
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Discuss
Correct Answer: CC
Explanation:
CC connection has very high input impedance and low output impedance.
5. Degaussing in a picture tube means
Options
A. Adding magnetism in mask and mounting frame
B. Removing residual magnetism in mask, shield etc...
C. Increasing resistance of coils to decrease time constant
D. Decreasing resistance of coils to increase time constant.
Show Answer
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Correct Answer: Removing residual magnetism in mask, shield etc...
Explanation:
Since gauss is a unit of magnetic flux, degaussing means removal of magnetism.
6. In a parallel resonant circuit, the circuit current at resonance is maximum.
Options
A. True
B. False
Show Answer
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Correct Answer: False
Explanation:
In parallel resonance current is minimum.
7. Both OR and AND gates can have only two inputs.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
Explanation:
Any number of inputs are possible.
8. Klystron amplifier is not used to amplifier very weak microwave signals due to
Options
A. low gain for weak signals
B. low noise for weak signals
C. high noise
D. both (a) and (b)
Show Answer
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Correct Answer: high noise
9. Which of the following is used in integrated circuits?
Options
A. Microstrip line
B. Coaxial line
C. Twin wire line
D. Shield cable
Show Answer
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Correct Answer: Microstrip line
10. The directive gain of a transmitting antenna is
Options
A. proportional to wavelength
B. inversely proportional to wavelength
C. proportional to square of wavelength
D. inversely proportional to square of wavelength
Show Answer
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Discuss
Correct Answer: inversely proportional to square of wavelength
Explanation:
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