# Practice Questions on Microwave Engineering

 Q1. Find the buncher and catcher voltage of a two-cavity klystron amplifier tuned at 3 GHz. The drift space length is 2 cm and beam current is 25 mA. The catcher voltage is 0.3 times the beam voltage.It is assumed that the gap length of the cavity << drift space so that the input and output voltages are in phase ($\beta=1$) for $N=5\dfrac{1}{4}$.
 A. $33.55\; V$, $87.1 \;V$ B. $41.43\; V$, $111.4 \;V$ C. $57.11\; V$, $129.5 \;V$ D. $65.33\; V$, $146.8\; V$

 Q2. Determine electronic efficiency and output power of a reflex klystron operating at 9 GHz with a dc beam voltage of 600 V for $1\dfrac{3}{4}$ mode, repeller space length of 1 mm, and dc beam current of 10 mA. The beam coupling coefficient is assumed to be 1.
 A. $1.3644\;W$, $22.74\%$ B. $2.361\;W$, $10.75\%$ C. $4.223\;W$ , $31.22\%$ D. $5.127\;W$ , $12.34\%$

 Q3. Determine the bandwidth over $\triangle V_R=1\text{ V}$of a reflex klystron operating at 5 GHz with dc beam voltage 350 V, repeller spacing 0.5 cm for $N=3\dfrac{3}{4}$ mode.
 A. 1.774 MHz B. 2.511 MHz C. 3.223 MHz D. 5.948 MHz

 Q4. Calculate the repeller voltage of a reflex kylstron which operates at frequency of 10 Ghz with a DC beam voltage of 300 V and repeller space of 0.1 cm for $1\dfrac{3}{4}$ mode for a beam current of 20 mA.
 A. 187.02 V B. 55.04 V C. -367.08 V D. -433.77 V

 Q5. A 50 ohm lossless line connects a matched signal of 100 kHz to a load of 100 ohm. The load power is 100 mW. The VSWR of the load is
 A. 2 B. 3 C. 5 D. 6

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