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Roll No. ..................................

Second-Term Examination

Sixth Semester [B.Tech] - April  2006

Paper Code : ETEC – 304 Subject : Microwave and Radar Engineering

Time : 11/2 Hours

Maximum Marks : 30

Note : Attempt any 3 questions in all. Q1 is compulsory. Each question carries 10 marks.

Q1

( a )

What is velocity modulation? Explain how velocity modulation is utilized in O-type tube amplifier>

4

( b )

What is the bunching process in Reflex Klystron tube. Discuss with Applegate diagram. 4
( c ) Write down the performance characteristics a Traveling Wave Tube (TWT). 2

Q2

( a )

Derive the expression for Hull's cutoff magnetic flux density of Cylindrical Cavity Magnetron.

5

( b )

A Reflex-Klystron operates at the peak mode of n=2 with beam voltage Vo=300V, beam current I0=40mA, and RF signal voltage V1=50V. Determine the:
a) Input power
b) Output power
c) Efficiency
Given that bunching parameter = 2.408 and Bessel's function = 0.52

5

Q3

( a )

Discuss Power-frequency, current-frequency, and voltage-frequency limitations of microwave transistors.

5

( b )

Explain the operation of a varactor diode. Discuss its figure of merits. 5

Q4

( a )

A helical TWT has a diameter of 5mm with 100 turns per cm. Calculate the axial phase velocity and the beam voltage at which the TWT can be operated.

4

( b )

Write short notes on :

1) Frequency measurement
2) VSWR measurement
3) Phase shift measurement

 

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