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Encoding Code39 in Software Copyright 2006, 2002, 1997, 1993 by The McGraw-Hill Companies, Inc. Click here for terms of use.

Copyright 2006, 2002, 1997, 1993 by The McGraw-Hill Companies, Inc. Click here for terms of use.
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(c) a transient. (d) an avalanche. (e) a clipped peak. 5. Which of the following is not characteristic of an oscillator (a) Negative feedback (b) Good output-to-input coupling (c) Reasonably high transistor gain (d) Alternating current signal output (e) Usefulness as a signal generator 6. Which layer of the ionosphere exists at the lowest altitude (a) The F layer (b) The E layer (c) The D layer (d) The C layer (e) The B layer 7. The beta of a bipolar transistor is another name for its (a) current amplification factor. (b) voltage amplification factor. (c) power amplification factor. (d) maximum amplification frequency. (e) optimum amplification frequency. 8. In a schematic diagram, the symbol for a PNP bipolar transistor can be recognized by (a) a broken vertical line inside the symbol circle. (b) an arrow inside the symbol circle, pointing from the base toward the emitter. (c) an arrow inside the symbol circle, pointing outward from the collector. (d) a collector biased at a positive voltage with respect to the emitter. (e) an arrow inside the symbol circle, pointing from the emitter toward the base. is an 9. Fill in the blank in the following sentence to make it true: In an oscillator, expression of the extent to which the circuit maintains constant signal frequency output under variable operating conditions, and is also an expression of its overall reliability. (a) sensitivity (b) drift ratio (c) gain (d) selectivity (e) stability 10. A Zener diode would most likely be found in (a) the mixer in a superheterodyne receiver. (b) the PLL in a circuit for detecting FM.
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(c) the product detector in a receiver for SSB. (d) the voltage regulator in a power supply. (e) the AF oscillator in an AFSK transmitter. 11. When the bias in an FET stops the flow of current, the condition is called (a) forward breakover. (b) cutoff. (c) reverse bias. (d) pinchoff. (e) avalanche. 12. The VA rating of a transformer is an expression of (a) the maximum frequency at which it can function. (b) the type of core material it has. (c) the voltage step-up or step-down ratio. (d) the impedance transfer ratio. (e) none of the above. 13. In an N-type semiconductor, the minority carriers are (a) electrons. (b) protons. (c) holes. (d) neutrons. (e) positrons. 14. A disadvantage of a half-wave rectifier is the fact that (a) the output voltage is excessive compared to that of a full-wave rectifier. (b) the output current is excessive compared to that of a full-wave rectifier. (c) the output waveform is harder to filter than is the case with a full-wave rectifier. (d) it requires several expensive diodes, whereas a full-wave rectifier requires only a single cheap diode. (e) it requires an expensive center-tapped transformer, whereas a full-wave rectifier does not need a transformer at all. 15. A power gain of 30 dB is equivalent to which amplification factor (a) 0.001 (b) 1 30 (c) 30 (d) 1000 (e) None of the above
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16. Suppose an RF power amplifier has a dc collector input of 60 W, and is 75 percent efficient. What is the RF signal output power (a) 80 W (b) 60 W (c) 45 W (d) 40 W (e) Impossible to determine from this data 17. If a listener is not expecting any change in the intensity of a signal or sound, the smallest change that can be noticed is approximately which of the following (a) 0.3 dB (b) 1 dB (c) 3 dB (d) 10 dB (e) 30 dB 18. A common base circuit is commonly employed as (a) a microwave oscillator. (b) a low-pass filter. (c) a noise generator. (d) a phase-locked loop. (e) an RF power amplifier. 19. A semiconductor material especially noted for its photoconductivity, and which is often used in making photocells, is (a) selenium. (b) lithium salt. (c) copper chloride. (d) aluminum oxide. (e) polyethylene. 20. Which type of PA circuit provides the highest efficiency when used with the appropriate amount of driving power (a) Class A (b) Class AB (c) Class B (d) Class C (e) All of the above circuits are equally efficient. 21. Baudot is a form of (a) video modulation. (b) diode.
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