Microwave and Radar Engineering 6th Sem/ECE/May 2019 Paper

Download Previous Year Diploma Paper of Microwave and Radar Engineering 6th Sem/ECE/May 2016 Paper

Microwave and Radar Engineering 6th Sem/ECE/May 2016 Diploma Question Paper

SECTION-A

Q1. a) Fill in the Blanks. 15×1=15

i. The Frequency range of K band is ____________ .
ii. Magnetron is a ___________device.
iii. In ________mode, the electric field is purely transverse to the direction of propagation while the magnetic field is not purely transverse.
iv. The IMPATT diode stands for .
v. Waves having wavelength lesser than cut-off wavelength (λc) cannot propagate in a waveguide. (T/F)
vi. A __________is a 2-port device which transmits microwave power in one direction only.
vii. A waveguide twist is used to change the ____________ .
viii. The parabolic reflector antennas have gain of the order of _________ .
ix. The sky-waves are returned to the earth from the ionosphere due to phenomena of ________ .
x. In H-type T-junction, if 180⁰ out of phase signals are fed into two arms, the output obtained from the third arm (perpendicular) will be _______ .
xi. ____________ is the highest frequency that can be used for transmission between two points at a specified time, independent of transmitter power.
xii. FMCW Radar stands for____________ Radar.
xiii. In CW radar, the range of the target cannot be detected. (T/F)
xiv. In CDMA, all the users are assigned different____________ .
xv. A transponder in which signal is demodulated, decoded, re-encoded and modulated on-board the satellite is called __________ .

SECTION-B

Q2. Attempt any five questions. 5×6=30

i. With the help of diagrams, explain velocity modulation and bunching process in multi-cavity klystron?
ii. Discuss the applications of Microwaves.
iii. Explain the working of a Magic-T hybrid junction.
iv. Define TE, TM and TEM modes in a waveguide. Which of these is not possible in a waveguide and why?
v. Discuss the characteristics and construction of parabolic reflector antennas.
vi. Explain the phenomena of tropospheric duct formation and propagation.
vii. Explain the working of CW Radar. Also give its limitations.
viii. Discuss various components of VSAT system.

SECTION-C

Q3. Attempt any three questions. 3×10=30

i. Explain the construction and working of TWT. Also give its applications.
ii. Write a short note on any TWO:
(a) Microwave Isolator
(b) GUNN Diode
(c) Horn antenna
iii. With the block diagram, explain the working of a microwave communication link. Explain the working of the MTI Radar with block diagram.

Microwave and Radar Engineering 6th Sem/ECE/May 2019 Diploma Question Solved Paper

SECTION-A

Q1. a) Fill in the Blanks. 15×1=15

a. RADAR stands for Radio Detection and Ranging .
b. TM01 or TM10 modes does not exist in a waveguide.
c. To couple a co-axial line to a parallel wire line, it is best to use a Balun .
d. The maximum unambiguous range in a system depends on Pulse Repetition Time (PRT) .
e. A helical antenna produces Circularly polarized waves.
f. VSWR stands for Voltage Standing Wave Ratio .
g. The line of sight communication range is limited due to Diffraction .
h. The uplink frequency is different from downlink frequency to avoid _________
i. VSAT network is operated in stand-alone mode.
j. Antenna reciprocity is put to use in RADAR systems.
k. Amplifier or Oscillator is a crossed field device.
l. In a hollow rectangular waveguide the phase velocity Decrease with increasing frequency.
m. PPI in a radar system stands for Plan Position Indicator .
n. The blind speed of MTI radar can be avoided by changing the _____rotation rate.
o. A coupling loop is placed at a point of__________ magnetic field intensity.