Info
Warning
Danger

Electrical Engineering Expert Answers, Study Resources & Learning Aids

Realtime assistance in electrical engineering is made possible from our experienced and dedicated experts. Electrical engineering resources like flashcards, book guides and a lot more are available for your access right away with live experts to assist you if you get stuck.

Ask an Expert

Our Experts can answer your tough homework and study questions.

Answers in as fast as 15 minutes
Post a Question
16. Collector-feedback bias is also called A. self-bias. B. collector follower. C. negative collector. D. voltage-divider. 17. Collector-feedback bias is still sensitive to changes in current gain, but it is used because of its A. small size. B. low cost. C. simplicity. D. complexity. 18. Emitter-feedback and collector-feedback are typically not adequate because A. there is too much negative feedback. B. there.
26 Views
View Answer
2.Voltage-divider bias is really emitter bias in disguise. 3. In the circuit shown in Figure 7-12, the first step in finding the emitter current is to determine the voltage across R2. 4. The emitter-base junction voltage of the silicon transistor shown in Figure 7-12 is approximated to be 0.3 V. 5. The emitter.
23 Views
View Answer
26. Semiconductor manufacturers make Darlington pairs inside a single case. What is this device known as? A. Semiconductor single case B. Darlington transistor C. power transistor D. regulator transistor 27. A Darlington connection comprised of npn and pnp transistors is called a A. stationary Darlington. B. Duo-Darlington. C. supplementary Darlington. D. complementary Darlington. 28. In conjunction with a zener diode,.
26 Views
View Answer
41. With ambiguous troubles, the troubleshooter very often must A. replace all suspected components. B. memorize the circuit diagram. C. disconnect one suspected component and test it. D. disconnect all suspected components and apply power. 42. What should a troubleshooter do if the base, collector, and emitter voltages in a transistor circuit all measure 0.
21 Views
View Answer
17. What is the mathematical approach that models the transistor on what is happening at its terminals without regard for the physical processes taking place inside the transistor? A. small-signal characteristics B. Thevenin's Theorem C. Kirchoff's Laws D. h parameters 18. One way to stabilize voltage gain is to leave some of the emitter resistance.
24 Views
View Answer
A. power output. B. power gain. C. voltage gain. D. beta. 27. When a single or double stage amplifier is not working, troubleshooting can begin by measuring dc voltages. 28. In order for a bypass capacitor to work properly, its reactance must be A. much smaller than the resistance. B. much larger than the resistance. C. equal to.
24 Views
View Answer
16. The middle region of a transistor is the ________. A. collector B. emitter C. base D. beta 17. Which region of the transistor is physically the largest? A. collector B. emitter C. base D. beta 18. The two junctions of a transistor are between the emitter and the base and between the A. collector and emitter. B. collector and base. C. collector.
24 Views
View Answer
16. With a common-collector amplifier, the input signal is A. coupled to the base and the output signal is taken from the emitter. B. coupled to the base and the output signal is taken from the collector. C. coupled to the emitter and the output signal is taken from the collector. D. coupled to.
25 Views
View Answer
36. Transistor saturation and cutoff regions are used in circuits referred to as ________. A. rectifiers B. filters C. switching circuits D. amplifiers 37. In a common-emitter circuit, once the base current has been calculated, collector current can be determined by multiplying base current by ________. A. alpha B. the load resistor C. maximum power rating D. beta 38. When.
24 Views
View Answer
2. A zener diode is sometimes called a voltage-regulator diode because it maintains a constant output voltage even though the current through it changes. 3. The zener diode must remain in the breakdown region under all operating conditions in order for a zener regulator to hold the output voltage constant. 4. The.
21 Views
View Answer
46. What would the voltage be across RL if C shorted? A.ac B.120 Vdc C.pulsating filtered dc D. zero 47. A device that keeps the current through it fixed when the voltage changes is aA. zener diode. B. current-regulator diode. C.silicon rectifier. D.tunnel diode. 48. A diode that is useful in frequency multiplier circuits is aA. snap diode. B.slope diode. C.photo.
22 Views
View Answer
31. The combination of an LED and a photodiode is called a(n) A.seven-segment display. B.laser. C.LCD. D. optocoupler. 32.What type of cable is comprised of thin flexible fibers of glass or plastic that transmit light beams instead of free electrons? A.coaxial B.stranded copper cable C. fiber-optic D. wave guide 33. What type of instrument can be used to test for.
23 Views
View Answer
41. It is very difficult to get a small output impedance with a A. common-collector amplifier. B. common-emitter amplifier. C. common-base amplifier. D. emitter-follower amplifier. 42. What is the circuit shown in Figure 9-16 (c)? A. two cascaded common-emitter amplifiers B. a small-signal amplifier C. a supplementary Darlington D. a complementary Darlington 43. What is the circuit shown in Figure.
28 Views
View Answer
41. In most applications, a small-signal transistor is not fan-cooled A. but it does have a heat sink. B. and it does not have a heat sink. C. but it can be used as a power transistor. D. and case temperatures are usually above 30°C. 42. The only way to keep a transistor case temperature.
22 Views
View Answer
A. ac resistance. B. dc resistance. C. reactance. D. impedance. 37. An equivalent transistor circuit model used to analyze ac signal processing that looks like a T on its side is the A. Fourier model. B. p model. C. Thevenin model. D. Ebers-Moll model. 38. What is the most popular circuit model that is used to analyze how a.
23 Views
View Answer
21. The type of biasing that produces the most useful results is A. forward-biasing the emitter diode and reverse-biasing the collector diode. B. reverse-biasing the emitter diode and forward-biasing the collector diode. C. forward-biasing the collector diode and reverse-biasing the base diode. D. reverse-biasing the collector diode and forward-biasing the base diode. 22. The base.
21 Views
View Answer
31. If the data sheet maximum rating, collector-emitter breakdown voltage is exceeded A. current gain becomes maximum. B. the emitter will become reverse biased. C. the transistor will go into cut-off. D. the transistor will breakdown and will probably be destroyed. 32. A transistor has a power dissipation that equals ________. A. VCE x RC B. VCE.
21 Views
View Answer
11. Transistor saturation and cutoff regions are useful in digital and computer circuits referred to as switching circuits. 12. Small-signal transistors can dissipate less than 1 watt. 13. The power rating of a transistor can be increased by using a heat sink. 14. In a system of analysis called h parameters, hFE is.
25 Views
View Answer
42. Amplified ripple out of a loudspeaker is detected as A. sine waves. B. high pitch noise. C. high frequency signals. D. low frequency hum. 43. In the circuit shown in Figure 8-4, what effect do the capacitors have on the dc biasing? A. add 0.7 V B. add 15 V C. puts transistor in cutoff D. no effect 44..
22 Views
View Answer
31. The zener follower provides the regulation of a zener diode with the increased current-handling capability of a A. common-collector circuit. B. common-emitter circuit. C. common-base circuit. D. common-follower circuit. 32. The amplifier configuration in which the input signal drives the emitter and the output signal is taken from the collector is the A. common collector. B..
24 Views
View Answer
11. The common-base amplifier is also called a grounded-base amplifier. 12. The output voltage of a common-base amplifier is out of phase with its input. 13. One of the major differences between the CB amplifier and other amplifier configurations is its A. low input impedance. B. low output impedance. C. high input impedance. D. input and.
23 Views
View Answer
36. The intent of emitter-feedback bias is to A. reduce the source voltage. B. swamp out the variations in current gain. C. swamp out the base current. D. increase current gain. 37. Collector-feedback bias is also called A. collector-follower bias. B. emitter-feedback bias. C. voltage-divider bias. D. self-bias. 38. Collector-feedback bias is more effective than emitter-feedback bias and is used.
22 Views
View Answer
21. In any amplifier, maximum power transfer occurs when the A. load impedance is much higher than the source impedance. B. load impedance is much lower than the source impedance. C. load impedance is made equal to the source impedance. D. load impedance is infinite and source impedance is zero. 22. When an emitter follower.
24 Views
View Answer
2. In an npn transistor, the emitter and collector are both n-type materials. 3. The emitter of a bipolar junction transistor is lightly doped and the base is heavily doped. 4.An unbiased transistor is like two back-to-back diodes. 5. The emitter current in a bipolar junction transistor is equal to the sum of.
23 Views
View Answer
2. A coupling capacitor couples an ac signal into an amplifier without disturbing its operating point. 3.Coupling capacitors can be approximated as dc shorts. 4.If there is any ac voltage at an amplifier's bypass emitter, it means that the A. transistor is shorted. B. transistor is open. C. coupling capacitor is open. D. bypass capacitor is.
24 Views
View Answer
6. A bypass capacitor is similar to a coupling capacitor because it appears open to dc and shorted to ac. 7.Voltage gain is ac output voltage divided by the ac input voltage. 8. Discrete means all components like resistors, capacitors, and transistors are created and connected on a chip, a piece of.
22 Views
View Answer
6. The zener diode data sheet rating, maximum current is the highest amount of current a zener diode can handle without exceeding its power rating. 7. A shorted component is equivalent to a resistance of zero, and an open component is equivalent to a resistance of infinity. 8.Optoelectronics is the technology that.
22 Views
View Answer
A. oscillation B. amplification C. distortion D. extortion 32. Distortion is undesirable in high-fidelity amplifiers because A. it changes the sound of voice and music. B. it amplifies the sound of voice and music. C. it trips a circuit breaker. D. it cannot be heard in either speaker. 33. What is one way to minimize distortion? A. use batteries only B..
23 Views
View Answer
6. A well-designed voltage-divider bias circuit is one in which the voltage divider appears stiff to the input resistance of the base. 7.With the switch in the position as shown in Figure 7-4 (a), the LED is on. 8. A firm voltage divider means that the collector current will be approximately 10.
24 Views
View Answer
12. It is standard practice to use capital letters and subscripts for dc quantities. 13. The ac resistance of the emitter diode equals the ac base-emitter voltage divided by the ac emitter current. 14. The ac equivalent circuit model called the Ebers-Moll looks like a P on its side and is sometimes.
24 Views
View Answer
36.What kind of diode has a metal such as gold or silver on one side of the junction and doped silicon on the other side? A.tunnel B.small-signal C. Schottky D. Zener 37. The Schottky diode has A. a large depletion layer. B. no depletion layer. C.a high reverse recovery time. D.no junction. 38. The Schottky diode is sometimes called a A.silicon.
24 Views
View Answer
2. In a common-collector amplifier, the emitter is always connected to ground. 3. One of the advantages of an emitter follower is its high output impedance. 4. It is very difficult to get a small output impedance with a common-collector amplifier. 5. An emitter follower can act as a buffer between the high.
25 Views
View Answer
21. While troubleshooting the circuit shown in Figure 7-26, the base voltage measures 1.8 V and the collector voltage measures 10 V, what should the technician do? A. replace the transistor B. replace RE C. check R1 D. check voltage source and leads 22. What type transistor is used when the electronics equipment has a.
24 Views
View Answer
26. What type transistor connection is shown in Figure 6-7 (a)? A. common emitter B. common collector C. common base D. emitter follower 27. What is the source of bias for the transistor's emitter diode shown in Figure 6-7 (a)? A. VCC B. VBB C. VCE D. RC 28. What is the purpose of RB in the circuit shown in.
23 Views
View Answer
41. With a varactor diode, the more it is reversed bias, its capacitance A. decreases. B.increases. C.remains the same. D.increases to 27 µF. 42. A varactor is often connected in parallel with an inductor to form a A.bridge rectifier. B.tunnel oscillator. C. parallel resonant circuit. D. parallelogram. 43. The capacitance exhibited by a varactor diode is controlled by ________. A. voltage B.current C.parallel.
22 Views
View Answer
26. A well-designed voltage-divider bias circuit is one in which the voltage divider appears A. stiff to the input resistance of the base. B. soft to the input resistance of the base. C. stiff to the output resistance of the collector. D. stiff to the input resistance of the emitter. 27. Using a firm voltage.
22 Views
View Answer
26. Examples of optoelectronic devices do not include ________. A. LEDs B. FETs C.photodiodes D.optocouplers 27. Which of the following is not an advantage of a light-emitting diode (LED)? A.low voltage B.long life C.fast on-off switching D. cost 28. LEDs have breakdown voltages that typically range from A. 3 to 5 V. B.1 to 2 V. C.6 to 10 V. D.10 to 15 V. 29..
24 Views
View Answer
46. When working with h parameter analysis, the symbol for current gain is ________. A. bDC B. hFE C. aFED. D. D 47. What type of transistor is usually found in a simple three-terminal, gull-wing package? A. chassis mount B. printed-circuit C. surface-mount D. power 48. What is the surface-mount package called that resembles the dual-inline package and houses multiple.
22 Views
View Answer
31. The biasing configuration shown in Figure 7-18 is derived from emitter bias and is referred to as A. emitter derived bias (EDB). B. bi-polar emitter bias (BPEB). C. two-supply emitter bias (TSEB). D. one-supply emitter bias (OSEB). 32. By exposing a transistor's collector junction to light, a manufacturer can produce A. an LED. B. a seven-segment.
23 Views
View Answer
46. A multistage amplifier can be created by cascading two or more filter circuits. 47. What is a multistage amplifier? A. a single stage amplifier B. a single stage attenuator C. two or more attenuators cascaded D. two or more amplifiers cascaded 48. If two or more amplifiers are connected to form a multistage amplifier A. gain.
27 Views
View Answer
6. A Darlington connection is a connection of two transistors whose overall current gain equals the sum of the individual gains. 7. A complementary Darlington is a connection of npn and pnp transistors. 8. Used with a zener diode, an emitter follower can produce regulated output voltages with much larger currents. 9. A.
23 Views
View Answer
16. The zener diode is the backbone of A. constant current sources. B. passive filters. C. voltage regulators. D. oscillator circuits. 17. What type of bias is required for normal operation of a zener diode? A. reverse B. forward C. positive D. negative 18. What is the circuit shown in Figure 5-2 (a)? A. RZ filter B. zener regulator C. voltage doubler D. half-wave.
22 Views
View Answer
36. The reason a common-collector amplifier is called an emitter follower is because A. the output voltage follows the input voltage. B. the output voltage is taken from the collector. C. the emitter is grounded. D. the output voltage is out of phase with the input. 37. What is the base voltage for the circuit.
26 Views
View Answer

Can't find what you're looking for ?

Ask our exprts a study questions, on us.
Get free Homework Help*