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(Please write your Roll No. immediately) |
Roll No. .................................. |
Sixth Semester [B.Tech] - April 2006
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Paper Code : ETEC – 304 Subject : Microwave and Radar Engineering |
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Time : 11/2 Hours |
Maximum Marks : 30 |
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Note : Attempt any 3 questions in all. Q1 is compulsory. Each question carries 10 marks. |
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Q1 |
( a ) |
What is velocity modulation? Explain how velocity modulation is utilized in O-type tube amplifier> |
4 |
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( 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 |
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Q2 |
( a ) |
Derive the expression for Hull's cutoff magnetic flux density of Cylindrical Cavity Magnetron. |
5 |
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( 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: |
5 |
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Q3 |
( a ) |
Discuss Power-frequency, current-frequency, and voltage-frequency limitations of microwave transistors. |
5 |
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( b ) |
Explain the operation of a varactor diode. Discuss its figure of merits. | 5 |
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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 |
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( b ) |
Write short notes on : 1) Frequency measurement |