If the S11 and S22 parameters of a common emitter operated BJT is high:

then the output and input ports are matched well

the gain of the amplifier is high

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1.	The S21 parameter of a HJT increases with increase in the operating frequency of the transistor.
A.	true
B.	false
Answer» C.

Discussion

2.	If a transistor has a short circuit current gain of 25 and the capacitance measured in the hybrid-π model of the transistor was 60 pF. Then the threshold frequency of operation of the transistor is:
A.	60 MHz
B.	45.6 GHz
C.	66.3 GHz
D.	34.8 GHz
Answer» D. 34.8 GHz

Discussion

3.	If the S11 and S22 parameters of a common emitter operated BJT is high:
A.	then the output and input ports are matched well
B.	there is mismatch in the ports
C.	the gain of the amplifier is high
D.	none of the mentioned
Answer» C. the gain of the amplifier is high

Discussion

4.	The hybrid-π model of a BJT is useful for analysis at all frequency ranges and variation of other transistor parameters.
A.	true
B.	false
Answer» B. false

Discussion

Explore topic-wise MCQs in Microwave Engineering Questions and Answers.

The S21 parameter of a HJT increases with increase in the operating frequency of the transistor.

If a transistor has a short circuit current gain of 25 and the capacitance measured in the hybrid-π model of the transistor was 60 pF. Then the threshold frequency of operation of the transistor is:

If the S11 and S22 parameters of a common emitter operated BJT is high:

The hybrid-π model of a BJT is useful for analysis at all frequency ranges and variation of other transistor parameters.