# Two-port Power Gains MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Two-port Power Gains”.

1. __________ 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

2. Transducer power gain of a two port network is dependent on :
a) ZS and ZL
b) ZS
c) ZL
d) Independent of both the impedances

3. The power gain G of a two port network is independent of the source impedance of the two port network.
a) True
b) False

4. 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)

5. For a unilateral transistor, the S parameter that is zero is:
a) S11
b) S12
c) S21
d) S22

6. 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

7. 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

8. Gain of an amplifier is independent of the operating frequency.
a) True
b) False

9. When both input and output of an amplifier are matched to zero reflection (in contrast to conjugate matching), the transducer power gain is:
a) │S212
b) │S222
c) │S122
d) |S112

10. 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