Microwave Engineering Solved MCQs Answers

By: Prof. Dr. Fazal Rehman | Last updated: March 3, 2022

Microwave Engineering Solved MCQs Answers

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

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C

2. If a common emitter configuration BJT is treated as a two-port network, the gain of the amplifier is roughly given by the S parameter: A. S12 B. S11 C. S23 D. S21

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D

3. Which of the current gain of a BJT with frequency ____________? A. decreases B. increases C. remains constant D. none of the mentioned

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A

4. When 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. 66.3 GHz B. 34.8 GHz C. 60 MHz D. 45.6 GHz

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A

5. What is the Advantage of HJT over BJT is that it has…? A. sophisticated construction B. higher gain C. high frequency of operation D. none of these

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C

6. What is the range of microwave frequencies normally regarded? A. 1000 to 10000 GHz B. 1 to 1000 MHz C. 10 to 1000 GHz D. 1 to 100 GHz

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D

7. When Microwave band of 10.9 to 36 GHz is? A. Q.band B. K.band C. C.band D. X.band

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B

8. What is the benefit of using a microwave? A. greater transmission distances B. greater transmission distances C. more spectrum space for signals D. simpler equipment E. None of these

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C

9. Which one of the following is not a disadvantage of microwaves? A. line of sight transmission B. higher cost equipment C. circuits are more difficult to analyze D. conventional components are not usable

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B

10. When any device with negative impedance as its characteristic property can be called… A. Oscillator B. Energy sink C. Energy source D. None of these

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C

12. During transistor oscillators, FET and BJT are used. Instability is achieved through… A. Giving positive feedback B. Using a tank circuit C. Giving negative feedback D. All of the above E. None of these

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A