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(c) digital code. (d) voice modulation. (e) AM detector. 22. The most stable type of oscillator circuit uses (a) a tapped coil. (b) a split capacitor. (c) negative feedback. (d) a common base arrangement. (e) a quartz crystal. 23. If the source-gate junction in an FET conducts, (a) it is a sign of improper bias. (b) the device will work in class C. (c) the device will oscillate. (d) the device will work in class A. (e) the circuit will have good stability. 24. What is the radix of the octal number system (a) 2 (b) 22 (c) 23 (d) 24 (e) 25 25. Signal-to-noise ratio (S/N) is often specified when stating (a) the selectivity of a receiver. (b) the stability of an oscillator. (c) the modulation coefficient of a transmitter. (d) the sensitivity of a receiver. (e) the polarization of an EM wave. 26. In a reverse-biased semiconductor diode, the junction capacitance depends on (a) the width of the depletion region. (b) the reverse current. (c) the P:N ratio. (d) the gate bias. (e) the avalanche voltage. 27. Suppose the bandwidth of the channel in a receiver s IF filter is 4.5 kHz at 30-dB power attenuation, and 3.0 kHz at 3-dB power attenuation. What is the shape factor (a) 10:1 (b) 1.5:1
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(c) 1:1 (d) 1:10 (e) More information is necessary to determine this. 28. A simple power supply filter can be built with (a) a capacitor in series with the dc output. (b) an inductor in parallel with the dc output. (c) a rectifier in parallel with the dc output. (d) a resistor in series and an inductor in parallel with the dc output. (e) a capacitor in parallel with the dc output. 29. Which of the following bipolar transistor circuits can, in theory, provide the most amplification (a) Common emitter (b) Common base (c) Common collector (d) Common gate (e) Common drain 30. The ratio of the difference in IC to the difference in IB that occurs when a small signal is applied to the base of a bipolar transistor is called the (a) static current amplification. (b) dynamic current amplification. (c) power factor. (d) efficiency. (e) current attenuation factor. 31. An example of a device that is commonly used as an oscillator at microwave frequencies is (a) a rectifier diode. (b) a weak-signal diode. (c) a Gunn diode. (d) a Zener diode. (e) an avalanche diode. 32. In the operation of a PNP bipolar transistor, which of the following is normal concerning the emitter and collector voltages (a) The collector is positive relative to the emitter. (b) The collector is at the same voltage as the emitter. (c) The collector is negative relative to the emitter. (d) The collector can be either positive or negative relative to the emitter. (e) The collector must be at ground potential.
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33. What can be done to minimize the capacitance of the P-N junction in a semiconductor diode, thereby making the component effective as a high-speed RF switch (a) The surface area of the P-N junction can be maximized. (b) A layer of intrinsic semiconductor can be placed between the P- and N-type materials. (c) The frequency of the applied signal can be made as high as possible. (d) The diode can be forward-biased with a high voltage. (e) A small-value resistor can be connected in series with each of several diodes, and the series diode-resistor combinations can all be connected in parallel. 34. Which type of modulation consists of one voice sideband, with a suppressed carrier (a) AM (b) LSB (c) FM (d) RTTY (e) PCM 35. Suppose a series-parallel network of resistors is assembled into an RF attenuator pad, which is a circuit deliberately intended to produce a constant signal loss over a wide band of frequencies. If the input RF voltage to this attenuator pad is 500 V and the output RF voltage is 100 V, what is the loss in decibels (a) 14.0 dB (b) 6.99 dB (c) 5.00 dB (d) 1.40 dB (e) 0.699 dB 36. In an AND gate, the output is high (a) if any input is high. (b) only when all inputs are low. (c) if any input is low. (d) only when all inputs are high. (e) only when all inputs have identical logic states. 37. A voltage-controlled oscillator makes use of (a) a varactor diode. (b) a Zener diode. (c) negative feedback. (d) a split capacitance. (e) adjustable gate or base bias. 38. The best electrical ground for a power supply is obtained by (a) connecting a small-value capacitor between the hot wire and a good earth ground, such as an 8-ft copper rod driven into the earth.
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