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Electronics and Communication Engineering
‣
Networks Analysis and Synthesis
Comments
Question
In a parallel resonant circuit, the circuit current at resonance is maximum.
Options
A. True
B. False
Correct Answer
False
Explanation
In parallel resonance current is minimum.
Networks Analysis and Synthesis problems
Search Results
1. The drift velocity of electrons is
Options
A. very small as compared to speed of light
B. equal to speed of light
C. almost equal to speed of light
D. half the speed of light
Show Answer
Scratch Pad
Discuss
Correct Answer: very small as compared to speed of light
Explanation:
Drift velocity of electrons is very small.
2. A series RL circuit has
. If a voltage 4 sin
t
+ 4
t
is applied, the steady state current will be
Options
A. 4 sin (4
t
- 45°)
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
R = 4 ?, L = 1 H, ? = 4 rad/sec, X
L
= 4 ?
3. A cable has an insulation resistance of 10
10
ohms. If the length is doubled, the insulation resistance will be
Options
A. 2 x 10
10
?
B. 0.5 x 10
10
?
C. 10
10
?
D. 4 x 10
10
?
Show Answer
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Discuss
Correct Answer: 0.5 x 10
10
?
Explanation:
Insulation resistance of cable is inversely proportional to length.
4. In figure, the current supplied by battery immediately after switching on the circuit is
Options
A. 1 A
B. 4 A
C. 10 A
D. 0
Show Answer
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Discuss
Correct Answer: 1 A
Explanation:
At
t
= 0, inductance behaves as open circuit.
5. For a transmission line open circuit and short circuit impedances are 20 ? and 5 ?. Then characteristic impedance is
Options
A. 100 ?
B. 50 ?
C. 25 ?
D. 10 ?
Show Answer
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Discuss
Correct Answer: 10 ?
Explanation:
Z
0
=
Z
oc
Z
sc
.
6. The terms RMS and average values apply only to sine waves.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
Explanation:
These terms are applicable to all waveshapes.
7. In an ac circuit, the maximum and minimum values of power factor can be
Options
A. 2 and 0
B. 1 and 0
C. 0 and -1
D. 1 and -1
Show Answer
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Discuss
Correct Answer: 1 and 0
Explanation:
Power factor is maximum and equal to 1 for purely resistive load. Power factor is minimum and equal to zero for purely reactive load.
8. The synthesis of minimum function was suggested by
Options
A. O'Brune
B. R. Richards
C. Bott and Duffin
D. none of the above
Show Answer
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Discuss
Correct Answer: O'Brune
Explanation:
The procedure is called Brune's synthesis.
9. Wave A = 100 sin ?
t
and wave B = 100 cos ?
t
. Then
Options
A. rms values of the two waves are equal
B. rms values of A is more than that of B
C. rms values of A is less than that of B
D. rms values of the two waves may or may not be equal
Show Answer
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Discuss
Correct Answer: rms values of the two waves are equal
Explanation:
Since peak values are equal, their rms values are equal irrespective of phase difference.
10. Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?
Options
A. Measurement of unknown voltage
B. Measurement of resistance
C. Measurement of unknown current
D. Calibration of voltmeter
Show Answer
Scratch Pad
Discuss
Correct Answer: Measurement of resistance
Explanation:
Unknown resistance is compared with a standard resistance. Therefore standardisation of potentiometer is not necessary.
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