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.

$65.33\; V$, $146.8\; V$

 View Ans

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.

$5.127\;W$ , $12.34\%$

 View Ans

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

 View Ans

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

 View Ans

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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