Explore topic-wise MCQs in Microwave Engineering.

This section includes 15 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.

If the load impedance of a two port network is 40 Ω and the characteristic impedance is 50 Ω, then the reflection coefficient of the two port network at the load end is:

A. -0.111
B. -0.333
C. -0.987
D. None of the mentioned
Answer» B. -0.333
Discussion
2.

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

A. │S21│2
B. │S22│2
C. │S12│2
D. |S11│2
Answer» B. │S22│2
Discussion
3.

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

A. Rds (fT)2/ 4Ri (f)2
B. 4Ri (f)2/Rds (fT)2
C. Rds/ Ri
D. None of the mentioned
Answer» B. 4Ri (f)2/Rds (fT)2
Discussion
4.

In a two port network, the source impedance was measured to be 25 Ω and the characteristic impedance of the transmission line was measured to be 50 Ω. 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
5.

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

A. (ZS –Z0)/ (ZS –Z0)
B. (ZS +Z0)/ (Z0 – Z0)
C. ZS / (ZS –Z0)
D. Z0/ (ZS –Z0)
Answer» B. (ZS +Z0)/ (Z0 – Z0)
Discussion
6.

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. ‚Äö√Ñ√∂‚àö√Ü‚àö√°S<sub>22</sub>‚Äö√Ñ√∂‚àö√Ü‚àö√°<sup>2</sup>
Discussion
7.

If_the_load_impedance_of_a_two_port_network_is_40_Ω_and_the_characteristic_impedance_is_50_Ω,_then_the_reflection_coefficient_of_the_two_port_network_at_the_load_end_is:$#

A. -0.111
B. -0.333
C. -0.987
D. None of the mentioned
Answer» B. -0.333
Discussion
8.

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
9.

Gain of an amplifier is independent of the operating frequency.

A. True
B. False
Answer» C.
Discussion
10.

For a unilateral transistor, the S parameter that is zero is:

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

In a two port network, the source impedance was measured to be 25 Ω and the characteristic impedance of the transmission line was measured to be 50 Ω. 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
12.

For a two port network the voltage reflection coefficient seen looking towards the load, –ìS 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> ‚Äö√Ñ√∂‚àö√ë‚àö¬® Z<sub>0</sub>)
Discussion
13.

Transducer power gain of a two port network is dependent on :

A. Z<sub>S</sub> and Z<sub>L</sub>
B. Z<sub>S</sub>
C. Z<sub>L</sub>
D. Independent of both the impedances
Answer» B. Z<sub>S</sub>
Discussion
14.

__________ is defined as the ratio of power available from the two port network to the power available from the source.

A. Transducer power gain
B. Available power gain
C. Power gain
D. None of the mentioned
Answer» C. Power gain
Discussion
15.

The power gain G of a two port network is independent of the source impedance of the two port network.

A. True
B. False
Answer» B. False
Discussion