Explore topic-wise MCQs in Microwave Engineering.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Microwave Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

When both input and output of an amplifier are matched to zero reflection (in contrast to conjugate matching), the transducer power gain is:

A. S<sub>21</sub> <sup>2</sup>
B. S<sub>22</sub> <sup>2</sup>
C. S<sub>12</sub> <sup>2</sup>
D. |S<sub>11</sub> <sup>2</sup>
Answer» B. S<sub>22</sub> <sup>2</sup>
Discussion
2.

Gain of a conjugate matched FET amplifier is given by the relation:

A. R<sub>ds</sub> (f<sub>T</sub>)<sup>2</sup>/ 4R<sub>i</sub> (f)<sup>2</sup>
B. 4R<sub>i</sub> (f)<sup>2</sup>/R<sub>ds</sub> (f<sub>T</sub>)<sup>2</sup>
C. R<sub>ds</sub>/ R<sub>i</sub>
D. None of the mentioned
Answer» B. 4R<sub>i</sub> (f)<sup>2</sup>/R<sub>ds</sub> (f<sub>T</sub>)<sup>2</sup>
Discussion
3.

In a two port network, the source impedance was measured to be 25 and the characteristic impedance of the transmission line was measured to be 50 . Then the reflection coefficient at the source end is:

A. -0.33333
B. -0.1111
C. 0.678
D. 0.2345
Answer» B. -0.1111
Discussion
4.

For a two port network the voltage reflection coefficient seen looking towards the load, S is:

A. (Z<sub>S</sub> Z<sub>0</sub>)/ (Z<sub>S</sub> Z<sub>0</sub>)
B. (Z<sub>S</sub> +Z<sub>0</sub>)/ (Z<sub>0</sub> Z<sub>0</sub>)
C. Z<sub>S</sub> / (Z<sub>S</sub> Z<sub>0</sub>)
D. Z<sub>0</sub>/ (Z<sub>S</sub> Z<sub>0</sub>)
Answer» B. (Z<sub>S</sub> +Z<sub>0</sub>)/ (Z<sub>0</sub> Z<sub>0</sub>)
Discussion