Maharshi Dayanand University Rohtak | 3rd
Principles of Communication Engineering
Browse PCE 3rd question papers for exam preparation and revision.
📚 Syllabus - PCE (Diploma Electronics and Communication Engineering 3rd)
11. Introduction (04 hrs)
a) Need for modulation and demodulation in communication systems
b) Basic scheme of a modern communication system.
c) Noise and its different types ( No mathematical derivation)
2. Amplitude modulation (06 hrs)
a) Derivation of expression for an amplitude modulated wave. Carrier and side band
components. Modulation index. Spectrum and BW of AM Wave. Relative power distribution
in carrier and side bands.
b) Elementary idea of DSB-SC, SSB-SC, ISB and VSB modulations, their comparison, and
areas of applications
3. Frequency Modulation (06 hrs)
a) Expression for frequency modulated wave and its frequency spectrum (without Proof and
analysis of Bassel function) Modulation index, maximum frequency deviation and deviation
ratio, BW of signals, Carson’s rule.
b) Comparison of FM and AM in communication systems
c) Narrow band and Wide Band FM.
4. Phase Modulation (06 hrs)
Expression for phase modulated wave, modulation index, comparison with frequency
modulation.
5. Principles of AM Modulators (06 hrs)
Circuit Diagram and working operation of:
a) Collector and Base Modulator
b) Square Law Modulator
- Balanced Modulator
- Ring Modulator
6. Demodulation of AM Waves (02 hrs)
Principles of demodulation of AM wave using diode detector circuit; concept of Clipping and
formula for RC time constant for minimum distortion (no derivation)
7. Principles of FM Modulators (06 hrs)
Circuit Diagram and working of reactance modulator, varactor diode modulator, VCO and
Armstrong phase modulator.
8. Demodulation of FM Waves (04 hrs)
a) Basic principles of FM detection using slope detector
b) Principle of working of the following FM demodulators
- Foster-Seeley discriminator
- Ratio detector
9. Pulse Modulation (08 hrs)
a) Statement of sampling theorem and elementary idea of sampling frequency for pulse
modulation
b) Basic concepts of time division multiplexing (TDM) and frequency division multiplexing
(FDM)
c) Types of pulse modulation-PAM, PPM, PWM (Generation and Detection) and their
comparison
Can't find the paper you need?
We don't have a recent paper for pce yet. Upload it and earn credits — it'll be reviewed before publishing.
About This Question Paper Collection
Browse PCE 3rd question papers for Diploma Electronics and Communication Engineering students at Maharshi Dayanand University Rohtak. This page helps students review question patterns, prepare for exams, and understand how previous papers are structured.
Select a paper below to open year-wise question papers, solutions, or available answer content where listed on BRpaper.
How Students Can Use These Papers
Old question papers for Principles of Communication Engineering are a quick way to see how Maharshi Dayanand University Rohtak has structured exams in the past — useful for timing practice and identifying high-priority topics.
Treat them as a supplement, not a replacement, for the latest syllabus and official notices, and use them to build confidence before the actual exam.
FAQ
Frequently Asked Questions
Helpful answers about this subject, papers, and exam preparation.
01 Are previous year question papers available for free download?
Yes, you can download past question papers for free.
02 Which courses are covered under the available question papers?
We cover multiple courses and streams, including engineering, management and more.
03 Are question papers available semester-wise?
Yes, papers are organized by course, stream and semester where applicable.
04 Do these question papers follow the latest syllabus?
They reflect the syllabus of the year they were issued; use them alongside the latest syllabus for guidance.
05 Can I use previous year papers for exam preparation?
Absolutely—practicing with past papers helps understand pattern, difficulty, and important topics.
06 Are management and engineering papers available?
Yes, papers are available across streams such as BTech, MBA, MCA and more where provided.
07 From which years are question papers available?
Availability varies by course; we list all years we have for each subject and semester.
08 Are these question papers officially released?
They are sourced from officially released papers or trusted archives where possible.
09 Do I need to create an account to download papers?
Most downloads are accessible without an account; some features may need login.
10 How often are question papers updated?
We add new papers as soon as they are available and keep the repository updated regularly.
Important
Important Disclaimer
BRpaper is not the official website of Maharshi Dayanand University Rohtak or any institution. BRpaper organizes available question papers for student reference only. For official notices, date sheets, results, syllabus changes, and academic updates, students should visit the official university website.