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Electronics and Communication Engineering
‣
Networks Analysis and Synthesis
Comments
Question
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.
Correct Answer
Explanation
R = 4 ?, L = 1 H, ? = 4 rad/sec, X
L
= 4 ?
Networks Analysis and Synthesis problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: 0.5 x 10
10
?
Explanation:
Insulation resistance of cable is inversely proportional to length.
2. 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
Scratch Pad
Discuss
Correct Answer: 1 A
Explanation:
At
t
= 0, inductance behaves as open circuit.
3. 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
Scratch Pad
Discuss
Correct Answer: 10 ?
Explanation:
Z
0
=
Z
oc
Z
sc
.
4. Which of the following is correct for a driving point functions?
Options
A. The real parts of all poles must be negative
B. The real parts of all poles and zeros must be negative
C. The real parts of all poles and zeros must be negative or zero
D. The real parts of all zeros must be negative
Show Answer
Scratch Pad
Discuss
Correct Answer: The real parts of all poles and zeros must be negative or zero
Explanation:
It is a necessary condition for response to be stable.
5. For node 1 in figure, KCL equation is
Options
A.
B.
C.
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer:
Explanation:
i
(
t
) is the incoming current. The currents leaving node 1 are
6. 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.
7. In a parallel resonant circuit, the circuit current at resonance is maximum.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
Explanation:
In parallel resonance current is minimum.
8. The terms RMS and average values apply only to sine waves.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
Explanation:
These terms are applicable to all waveshapes.
9. 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
Scratch Pad
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.
10. 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
Scratch Pad
Discuss
Correct Answer: O'Brune
Explanation:
The procedure is called Brune's synthesis.
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