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| Roll No. | Total No. of Pages : 02 | Total No. of Questions : 09 |
B.Tech.(EIE) (2011 & Onwards) (Sem.-4)
SIGNALS AND SYSTEMS
Subject Code : EC-206
M.Code : 57512
| Time: 3 Hrs. | Max. Marks : 60 |
INSTRUCTION TO CANDIDATES :
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- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
SECTION-A
Q1. Explain briefly :
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- Define unit ramp signal.
- What is power spectral density?
- Sketch the following signal:
x(t) = A[u(t + a) –u(t - a)] for a > 0 - What is matched filter?
- How can you classify Random processes?
- What is meant by signum function? Explain.
- Explain the relationship between joint PDF and Probability.
- Define Analog Signal
- State the sampling theorem for low pass signals.
- An amplifier has a bandwidth of 4 MHz with 10kO as the input resistor. Calculate the RMS voltage at the input to this amplifier if the room temperature is 25°C.
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SECTION-B
Q2. Find the Fourier transform of an Impulse function x(t) = d(t). Also draw its spectrum.
Q3. Show that a system with excitation x(t) and response y(t) described by y(t) = u(x(t)) is non-linear, time invariant, stable and non-invertible.
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Q4. Explain the joint probability function and its various properties.
Q5. What do you mean by noise? How can you classify the noise?
Q6. A receiver having equivalent input noise resistance of 2500O and input resistance of 500 O is connected to an antenna of resistance 50O. Calculate the noise figure in dBs and equivalent noise temperature of the receiver.
SECTION-C
Q7. Find the Fourier Transform of following signals x1(t) and x2(t)
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FIG.1
Q8. Explain what matched filter is. How it differs from optimum filter? Derive an expression for error probability of matched filter.
Q9. A random variable X has PDF
f(x) =
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Find :
- Mean value
- Variance
- Mean Square value
- Standard deviation
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NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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This download link is referred from the post: PTU B.Tech 4th Semester Last 10 Years 2009-2019 Previous Question Papers|| Punjab Technical University