Previous year question paper for MRE (Diploma Electronics & Communication Engineering 5th)

1. Introduction to Microwaves (2hrs)

Introduction to microwaves and its applications, Classification on the basis of

its frequency bands (HF, VHF, UHF, L, S, C, X, KU, KA, mm, SUB, mm)

2. Microwave Devices (14hrs)

Basic concepts of thermoinic emission and vacuum tubes, Effects of inter

electrode capacitance Lead Inductance and Transit time on the high frequency

performance of conventional vacuum tubes, and steps to extend their high

frequency operations. Construction, characteristics, operating principles and

typical applications of the following devices (No mathematical treatment)

- Multi cavity klystron

- Reflex klystron

- Multi-cavity magnetron

- Traveling wave tube

- Gunn diode and

- Impatt diode

3. Wave guides (06hrs)

Rectangular and circular wave guides and their applications. Mode of

waveguide; Propagation constant of a rectangular wave guide, cut off

wavelength, guide wavelength and their relationship with free space wave

length (no mathematical derivation).Impossibility of TEM mode in a wave

guide.

4. Microwave Components (8hrs)

Constructional features, characteristics and application of tees, bends,

matched termination, twists, detector, mount, slotted section, directional

coupler, fixed and variable attenuator, isolator, circulator and duplex, coaxi alto

wave guide adapter

5. Microwave antennas (4hrs)

Structural characteristics and typical applications of Horn and Dish antennas

6. Microwave Communication systems : (8hrs)

a) Block diagram and working principles of microwave communication link.

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b) Troposcatter Communication: Troposphere and its properties, Tropospheric

duct formation and propagation, troposcatter propagation.

7. Radar Systems (12hrs)

7.1 Introduction to radar, its various applications, radar range equation

(noderivation) and its applications.

7.2 Block diagram and operating principles of basic pulse radar. Concepts of

ambiguous range, radar area of cross-section and its dependence

onfrequency.

7.3 Block diagram and operating principles of CW (Doppler) and FMCW

radars, and their applications.

7.4 Block diagram and operating principles of MTI radar.

7.5 Radar display- PPI

8. VSAT

Introduction to VSAT itsfeatures and applications. (2 hrs)