EXELIS Wireless Electronics MCQ Questions Answers

1. What is the output PEP of an unmodulated carrier transmitter if a wattmeter connected to the transmitter output indicates an average reading of 1060 watts?

2. What is a non-inverting op-amp circuit?

3. What is an inverting op-amp circuit?

4. When does inter-modulation interference between two repeater transmitters usually occur?

5. What is the total bandwidth of an FM-phone transmission having a 5-kHz deviation and 3-kHz modulating frequency?

6. In a single sideband and CW receiver, the __________ is connected to the output of the product detector.

7. In a single sideband and CW receiver, the output of the ___________ is connected to the product detector.

8. Two amplifiers with gains of 10 dB and 40 dB are connected in cascade. The gain of the combination is:

9. In a single sideband transmitter, the output of the linear amplifier is connected to the ______________.

10. While using a deviation meter, it is important to know the:

11. An FM wave with single-tone modulation has:

12. What is the input impedance of a theoretically ideal op-amp?

13. In a single sideband transmitter, the output of the variable frequency oscillator is connected to the __________.

14. In a single sideband and CW receiver, the __________ is connected to the output of the audio frequency amplifier.

15. In a single sideband transmitter, the output of the ___________ is connected to the balanced modulator.

16. In which situation are helical filters used in wireless communication?

17. What determines the input impedance of an FET common- source amplifier?

18. What are the three general groupings of filters?

19. Which is/are the primary function(s) of the crystal band-pass filters?

20. In a single sideband transmitter, the output of the _________ is connected to the mixer.

21. In a frequency modulation receiver, the_________ is in between the mixer and intermediate frequency amplifier.

22. What are the advantages of using an op-amp instead of LC elements in an audio filter?

23. What is the output PEP from a transmitter if an oscilloscope measures 500 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?

24. What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50-ohm dummy load connected to the transmitter output?

25. Which term is most appropriate for a high gain, direct-coupled differential amplifier, the characteristics of which are determined by the components mounted externally?

26. For what portion of a signal cycle does a Class A amplifier operate?

27. In a frequency modulation receiver, the output of the___________ is connected to the mixer.

28. In a frequency modulation receiver, the __________ is in between the antenna and mixer.

29. Which one is the principal use of an op-amp RC active filter circuitry?

30. In the common emitter amplifier, when the input and output signals are compared, the output signal lags the input signal by 90 degrees.

31. In a frequency modulation receiver, the output of the high frequency oscillator is fed to the:

32. Which bipolar transistor amplifier circuits is similar to a field-effect transistor (FET) amplifier common source circuit?

33. What is the primary advantage of the Butterworth filter over the Chebyshev filter?

34. Which filter type is not suited to audio and low radio frequencies?

35. In a single sideband and CW receiver, the _____________ is in between the mixer and intermediate frequency amplifier.

36. In a frequency modulation receiver, the _________ is connected to the input of the radio frequency amplifier.

37. What is the primary advantage of the Chebyshev filter over the Butterworth filter?

38. Which class of an amplifier provides the highest efficiency?