7/23/2019 QP-Module 2.docx

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MICROWAVE ENGINEERING

UNIVERSITY QUESTIONS- MODULEII

2 Mark 

1. A reflex klystron operates under the following condition. V0=600 V, L=1mm, em=1.!"#

$ 1011,fr=#%&'. A tu(e is oscillating at fr at the peak of the n=) mode. Assume that the

transit time through the gap and (eam loading can (e neglected. *ind the +alue of the

repeller +oltage.

). rite down the significance of inter electrode capacitance in con+entional +acuum tu(es

at microwa+e fre-uencies.

. rite down the significance of lead inductance in con+entional +acuum tu(es at

microwa+e fre-uencies.

/. ompare A and klystron.". 2xplain (asic principle of 3 link.

6. hat are the slow wa+e structures used in

!. hat is +elocity modulation4

5. 2xplain the significance of multica+ity klystron.#. %i+e the difference (etween a+alanche transit time and 2.5 Mark 

1. raw schematic diag. of 7eflex 8lystron oscillator and explain its operation.

). raw the applegate diagram of reflex klystron.

. hy ) ca+ity 8A is not preferred as a 7eflex oscillator /. hat are applications of magnetron.

". hat are the high fre-uency effects in con+entional tu(es.

6. eri+e expression for ac power op of 8A.!. hat are the limitations of con+entional +acuum tu(es at microwa+e fre-uencies.

5. ifferentiate (etween multica+ity klystron and reflex klystron.#. hat are the gain parameters in gunn diode4 2xplain its significance.12 Mark 

1. raw the schematic diagram of / ca+ity 8A and explain its operation.

List the characteristics of ) ca+ity 8A.

). hat are the classifications of magnetron oscillator4 raw schematic of cylindrical

magnetron and explain its operation.. 2xplain constructional details of amplifier and also explain the formation of

electron (unches in it.

/. 2xplain constructional details of 5 ca+ity magnetron and define cut off magnetic field.". efine an expression for transit time in the ) ca+ity 8A.

6. 2xplain construction, principle of operation and working details of 7eflex 8lystron withdiagram.

7. 9lot and explain output power and fre-uency characteristics of a 7eflex 8lystron and also

explain the different modes of oscillations in it.