Electronic Communications A System Approach 1st Edition by Jeffrey S. Beasley - Test BankElectronic Communications A System Approach 1st Edition by Jeffrey S. Beasley - Test Bank

Electronic Communications A System Approach 1st Edition by Jeffrey S. Beasley – Test Bank

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Sample Questions Are Posted Below

Beasley/Electronic Communications

Chapter 5: Transmitters

Multiple Choice Questions

1. To where does the transmitter deliver its power?

1. Modulator
2. Oscillator
3. Amplifier
4. Antenna

2. The oscillator that generates the carrier signal will be crystal-controlled to maintain the high accuracy required by the _______________.

1. broadcast radio station
2. FM transmitter
3. FCC
4. Crosby-type modulator

3. From where does the intelligence amplifier receive its signal?

1. Input transducer
2. Oscillator
3. Modulator
4. Cathode

4. What term describes amplifiers intended to produce intermediate levels of power amplification?

1. Transformer
2. Capacitor
   C. Driver
3. D. Carrier

5. In what application are vacuum tubes still found in electronic communications?

1. Frequency-modulated oscillator
2. High-power radio transmitters
3. Stereo multiplex FM broadcasts
4. Frequency-division multiplexing

6. What is transmitter troubleshooting in the frequency domain heavily reliant on?

1. Spectrum analyzers
2. High-level modulators
3. Neutralizing capacitors
4. Transistor modulators

7. A(n) ____________ AM signal will usually cause a change in dc current flow.

1. interfering
2. controlled
3. distorted
4. unwanted

8. Which of the following prevents damage to the output circuits that may occur under unloaded conditions?

1. Spectrum analyzer
2. Dummy antenna
3. Balanced modulator
4. Single-sideband transmitter

9. The ___________ of SSB generation relies on the fact that the upper and lower sidebands of an AM signal differ in the sign of their phase angles.

1. frequency deviation
2. phase shift
3. phase method
4. modulator stage

10. FM transmitters are composed of oscillators, amplifiers, modulating stages, and ____________.

1. filters
2. sidebands
3. circuits
4. analyzers

11. What is a balanced modulator an example of?

1. Linear multiplier
2. Low-level modulation
3. High-level modulation
4. Integrated circuits

12. In a reactance modulator, a transistor is effectively made to function as a(n) ______________.

1. master oscillator
2. FM transmitter
3. varactor diode
4. variable capacitance

13. Which of the following is an FM system utilizing direct generation with AFC?

1. Phase-locked-loop (PLL)
2. Armstrong
3. Crosby
4. Multiplex operation

14. The electronic circuitry used to increase the operating frequency of a transmitter up to a specified value is called the_____________.

1. frequency multiplier
2. pump chain
3. phase shifter
4. balanced modulator

15. _____________ is the simultaneous transmission of two or more signals on one carrier.

1. Phase-detector output
2. Operating frequency
3. Electronic circuitry
4. Multiplex operation

16. Which of the following is when signals are multiplexed together by having them coexist in two different frequency ranges?

1. Frequency multipliers
2. Frequency-division multiplexing
3. Frequency-modulation
4. Preemphasis

17. The ___________ amplifier provides a high-impedance load for the oscillator to minimize drift or undesired frequency shift as a result of circuit-loading effects.

1. final
2. intelligence
3. buffer
4. modulated

18. Which of the following is a problem for all RF amplifiers (linear and class C) both tube-based and solid state?

1. Self-oscillation
2. High-level modulation
3. Varying amplitudes
4. Low-level modulation

19. What is the choice of high- or low-level modulation largely driven by?

1. Desired amplification
2. Distortion
3. Self-oscillation
4. Required power output

20. The modulation process is accomplished in a(n) ________________.

1. nonlinear device
2. linear devices
3. transmitter
4. amplifier

21. What will a standard oscilloscope display of the transmitted AM signal indicate?

1. Modulating voltage
2. Gross deficiencies
3. Intelligence frequency rate
4. Available energy

22. What usually causes downward modulation?

1. Improper phase relationship
2. Interfering frequency components
3. Stray coupling
4. D. Insufficient excitation

23. An unwanted sideband can be suppressed by either the filter method or the ________ method.

1. phasing
2. conversion
3. balanced
4. D. modulating

24. A direct FM system is one in which the frequency of the carrier oscillator is directly varied by the ___________.

1. unwanted sideband suppression
2. phase-shifted data
3. modulating signal
4. capacitance

25. What term is used to denote the circuitry that generates the modulated signal?

1. Detector
2. Exciter
3. Pump chain
4. Discriminator