UGC NET Paper 2 Electronic Science Networks Previous Year Paper 2004 J/D - 2005 J/D

1. UGC NET
PAPER - II
JRF / Assistant Professor

2. Electronic
Science

3. Networks & Signals
Previous Year Questions
2004 – June / Dec
2005 – June / Dec

4. Electronic Science – Networks and Signals – December 2004:
Match the list – I with list – II:
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Answer: 1
List – I List – II
A. Passive Network i. Contains electrically separated passive circuit
B. Active Network ii. Contains electrically inseparable passive circuit
C. Lumped Network iii. Contains circuit elements without energy
D. Distributed Network iv. Contains circuit elements with energy sources
A B C D
1. iii iv i ii
2. i ii iii iv
3. ii i iv iii
4. iv i ii iii
Explanation

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 Passive Network: A network containing circuit elements without energy sources.
 Active network: A network is said to be active if it contains energy sources together with
other passive elements.
 Lumped network: Physically separated resistors, inductors and capacitors are called lumped
parameters.
 Distributed network: A network is said to be distributed network elements cannot be
electrically separated and individually isolated as separated elements.

6. Electronic Science – Networks and Signals – June 2005:
Norton’s theorem results in.
1. A current source with an impedance in parallel
2. A voltage source with an impedance in series
3. A voltage source alone
4. A current source alone
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Answer: 1

7. 01
03
04
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Answer: 4
Electronic Science – Networks and Signals – June 2005:
The Fourier transform of a function 𝒇(𝒕) is given by:
1. 𝟎
∞
𝒇(𝒕)𝒆 𝒔𝒕 𝒅𝒕
2. 𝟎
∞
𝒇(𝒕)𝒆𝒋𝒘𝒕 𝒅𝒕
3. −∞
∞
𝒇(𝒕)𝒆𝒋𝒘𝒕 𝒅𝒕
4. −∞
∞
𝒇(𝒕)𝒆−𝒋𝒘𝒕 𝒅𝒕

8. Electronic Science – Networks and Signals – June 2005:
Assertion (A): Superposition Theorem can be used to determine the output of a full wave rectifier
whose inputs are sinusoidal signals at different frequencies connected in series.
Reason (R): Superposition Theorem holds good for all linear systems.
1. Both (A) and (R) are true and (R) is the correct explanation of (A)
2. Both (A) and (R) are true but (R) is not a correct explanation of (A)
3. (A) is true but (R) is false
4. (A) is false but (R) is true
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Answer: 4

9. Electronic Science – Networks and Signals – December 2005:
The potential difference between two points can be expressed as:
1. Volt per meter
2. Watt per meter
3. Coulomb per newton
4. Volt per ampere
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Answer: 2
Explanation

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Voltage can be defined as the electric potential present along with a wire when
an electric current of one ampere dissipates the power of 1 watt.
Voltage = Watt per ampere. Voltage also can termed as Joule per Coulomb.

11. Electronic Science – Networks and Signals – December 2005:
Laplace Transform of 𝒆−𝒂𝒕 𝒔𝒊𝒏 𝝎𝒕 is.
1.
𝝎
𝒔+𝒂 𝟐+𝝎 𝟐
2.
𝝎
𝒔−𝒂 𝟐+𝝎 𝟐
3.
𝝎
𝒔−𝒂 𝟐−𝝎 𝟐
4.
𝝎
𝒔+𝒂 𝟐−𝝎 𝟐
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Answer: 1

12. Electronic Science – Networks and Signals – December 2005:
In a linear network the ratio of voltage excitation to current response is unaltered
when position of excitation and response are interchanged. This assertion stems
from:
1. Principle of duality
2. Principle of superposition
3. Reciprocity Theorem
4. Equivalent Theorem
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Answer: 3

13. Electronic Science – Networks and Signals – December 2005:
A linear discrete time system has the characteristics equation 𝒁 𝟐 − 𝟎. 𝟖𝟏𝒁 = 𝟎. The system is.
1. Stable
2. Marginally Stable
3. Unstable
4. Stability cannot be assessed
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Answer: 1
Explanation

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𝒁 𝟐 − 𝟎. 𝟖𝟏𝒁 = 𝟎
𝒁 𝒁 − 𝟎. 𝟖𝟏 = 𝟎
𝒁 𝒁 − 𝟎. 𝟗 𝒁 + 𝟎. 𝟗 = 𝟎
𝒁 = 𝟎, 𝟎. 𝟗, −𝟎. 𝟗
Since all the roots lies inside the unit circle.
Hence the given system is stable.

15. Electronic Science – Networks and Signals – December 2005:
Match the list – I with list – II:
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Answer: 2
List – I List – II
A. Linearity i. Superposition Theorem
B. Structure ii. Norton’s Theorem
C. Equivalent Circuit iii. Tellegan’s Theorem
D. Bilateral iv. Reciprocity Theorem
A B C D
1. iii iv i ii
2. i ii iii iv
3. ii i iv iii
4. iv i ii iii

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