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Exam Details

Electronics & Communication Engineering (EC) 2012

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Questions 65
Duration 180 mins
Package Electronics & Communication Engineering (EC) - Previous Year Papers

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Difficulty distribution

Easy 65 100%

Question type distribution

Multiple Choices 65 100%

Instructions

Electronics & Communication Engineering (EC) 2012 – Instructions
  • Total number of questions: 65
  • 30 questions carry one mark each
  • 35 questions carry two marks each
  • Negative marking: 1/3 of the marks allotted to the question
  • Use of calculator is allowed
  • This is a proctored examination
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  • After three warnings, the examination window will close automatically

Syllabus

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Sample questions from this paper

Questions are selected across the paper subjects wherever the paper contains that variety.

1
2012 · Unclassified
Electronics & Communication Engineering (EC) 2012
Q.1 – Q.25 carry one mark each.

The current i1 through the base of a silicon npn transistor is 1+0.1 cos(10000πt) mA. At 300 K, the rx in the small signal model of the transistor is

A
250 Ω
B
27.5 Ω
C
25 Ω
D
22.5 Ω
2
2012 · Unclassified
Electronics & Communication Engineering (EC) 2012

The power spectral density of a real process X(t) for positive frequencies is shown below. The values of E[X(0)] and E[|X(t)|], respectively, are

A
6000/π, 0
B
6400/π, 0
C
6400/π, 20/(π√2)
D
6000/π, 20/(π√2)
3
2012 · Unclassified
Electronics & Communication Engineering (EC) 2012

In a baseband communications link, frequencies up to 3500 Hz are used for signaling. Using a raised cosine pulse with 75% excess bandwidth and for no inter-symbol interference, the maximum possible signaling rate in symbols per second is

A
1750
B
2625
C
4000
D
5250
4
2012 · Unclassified
Electronics & Communication Engineering (EC) 2012

A plane wave propagating in air with E̅ = (8âx + 6âγ + 5âz) e^(-j(ωt-3x+4y)) V/m is incident on a perfectly conducting slab positioned at x ≤ 0. The E̅ field of the reflected wave is

A
(-8âₓ - 6âᵧ - 5âz) e^(-j(ωt+3x-4y)) V/m
B
(-8âₓ + 6âᵧ - 5âz) e^(-j(ωt+3x-4y)) V/m
C
(-8âₓ - 6âᵧ + 5âz) e^(-j(ωt+3x-4y)) V/m
D
(-8âₓ + 6âᵧ + 5âz) e^(-j(ωt+3x-4y)) V/m
5
2012 · Unclassified
Electronics & Communication Engineering (EC) 2012

The electric field of a uniform plane electromagnetic wave in free space, along the positive x direction, is given by E̅ = 10(âγ + jâz) e^(-j25x). The frequency and polarization of the wave, respectively, are

A
1.2 GHz and left circular
B
4 Hz and left circular
C
1.2 GHz and right circular
D
4 Hz and right circular
6
2012 · Unclassified
Electronics & Communication Engineering (EC) 2012

Consider the given circuit.

A
does not occur
B
occurs when CLK = 0
C
occurs when CLK = 1 and A = B = 1
D
occurs when CLK = 1 and A = B = 0