120465590 - ELECTRONICS 2: ELECTRONIC CIRCELECTRONICS 2: ELECTRONIC CIRCELECTRONICS 2: ELECTRONIC PDF

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UGRD-ECE6203 Electronics 2:Electronic Circuit Analysis and DesignFINALS QUIZ AND EXAMQuestion 1Not yet answered Marked out of 1.Flag question Question text The only way to close a transistor latch circuit is by thermal runaway.Select one:a. Falseb. TrueClear my choiceQuestion 2Not yet answered Marke...

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UGRD-ECE6203 Electronics 2: Electronic Circuit Analysis and Design FINALS QUIZ AND EXAM Question 1 Not yet answered Marked out of 1.00

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The only way to close a transistor latch circuit is by thermal runaway. Select one: a. False b. True Clear my choice Question 2 Not yet answered Marked out of 1.00

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With a class A amplifier, collector current flows Select one: a. for half the ac cycle

b. for 180 degrees of the ac cycle c. for less than half of the ac cycle d. throughout the ac cycle Clear my choice Question 3 Not yet answered Marked out of 1.00

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A standard oscillator circuit used for low to moderate frequencies in the range of 5 Hz to 1 MHz and the one almost always used in commercial audio generators is the Select one: a. Hartley b. Armstrong c. phase-shift d. Wien-bridge Question 4 Not yet answered Marked out of 1.00

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Matching impedances provides Answer the amplifier to the speaker.

power transfer from

maximum Question 5 Not yet answered Marked out of 1.00

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A transformer can be used to match the impedance of a speaker to the higher impedance of a class A amplifier. Select one: a. True b. False Clear my choice Question 6 Not yet answered Marked out of 1.00

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The Answer

acts like two SCRs in reverse parallel.

triac Question 7 Not yet answered Marked out of 1.00

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A semiconductor that uses internal feedback to produce switching action is a Select one: a. zener diode b. rectifier c. transistor d. thyristor Clear my choice Question 8 Not yet answered Marked out of 1.00

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A Hartley oscillator uses a tapped resistor to provide the feedback signal. Select one: a. True

b. False Clear my choice Question 9 Not yet answered Marked out of 1.00

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The Answer amplifier has emerged as the clear winner over more traditional class A and AB amplifiers. switching Question 10 Not yet answered Marked out of 1.00

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Which is not a mode of operation for the 555 timer? Select one: a. bi-stable b. monostable c. astable d. free running Clear my choice

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The Wien-bridge oscillator uses a resonant feedback circuit called a Select one: a. tuned tank b. lead-lag circuit c. quartz crystal d. notch circuit Clear my choice Question 12 Not yet answered Marked out of 1.00

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The power rating of a transistor can be effectively increased by Select one: a. reducing power supply voltages b. using bigger transistors

c. using slow-blow fuses d. using heat sinks Clear my choice Question 13 Not yet answered Marked out of 1.00

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To vary the speed of an AC motor, you need to vary the Answer of the voltage applied to it. frequency Question 14 Not yet answered Marked out of 1.00

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The voltage controlled crystal oscillator is a crystal oscillator that is optimized for external Answer control by way of a DC input. frequency Question 15 Not yet answered Marked out of 1.00

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The SCR is turned on by Select one: a. reducing anode voltage b. gate voltage c. forced commutation d. increasing anode voltage Clear my choice Question 16 Not yet answered Marked out of 1.00

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A

Answer

is a common product that is widely used to

keep computers and other critical equipment powered up during a power failure. UPS Question 17 Not yet answered Marked out of 1.00

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A gate voltage can turn a power FET on and off. Select one: a. True b. False Clear my choice Question 18 Not yet answered Marked out of 1.00

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Battery packs used in most electric cars, power special Answer or AC drives to control the car's speed. transmitter Question 19 Not yet answered Marked out of 1.00

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To reset an SCR, reducing VCC, interrupting anode to cathode current or forced Answer can be used.

commutation Question 20 Not yet answered Marked out of 1.00

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Most oscillators today are discrete transistor oscillators. Select one: a. True b. False Clear my choice Question 21 Not yet answered Marked out of 1.00

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A high power class A amplifier that delivers 150 watts of power to a 50 ohm load dissipates Answer watts as heat. 150 Question 22 Not yet answered Marked out of 1.00

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A zener is what type regulator? Select one: a. buck b. shunt c. series d. boost Clear my choice Question 23 Not yet answered Marked out of 1.00

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The gain of a typical audio amplifier is usually in the Select one: a. 10 to 20 dB range b. 60 to 100 dB range c. 20 to 50 dB range d. 100 to 200 dB range Clear my choice Question 24 Not yet answered Marked out of 1.00

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The amplifier that precedes the output stage is referred to as the Select one: a. power amplifier b. tuned tank c. driver d. preamp Clear my choice Question 25 Not yet answered Marked out of 1.00

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Frequency stability is a measure of how much the frequency deviates from the desired value over a specific temperature range. Select one: a. True b. False Clear my choice

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The input to the SCR is called the Answer thyristors Question 27 Not yet answered Marked out of 1.00

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With switching amplifiers, efficiencies of Select one: a. 70% or greater are common place b. approximately 20% are common place c. less than 10% are common place d. approximately 50% are common place Clear my choice Question 28 Not yet answered Marked out of 1.00

.

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Switch-mode power supplies are power supplies that use switching techniques rather than linear methods to provide regulation and other power supply functions. Select one: a. True b. False Clear my choice Question 29 Not yet answered Marked out of 1.00

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Which thyristor is the most widely used? Select one: a. four-layer diode b. triac c. SCR d. diac Clear my choice

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PWM allows a low-frequency modulating signal to change the pulse width of a high-frequency signal called the Select one: a. FM b. carrier c. modulating signal d. pulse-width signal Clear my choice Question 31 Not yet answered Marked out of 1.00

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Load regulation indicates how much the line voltage changes when the load changes. Select one: a. True b.

False Clear my choice Question 32 Not yet answered Marked out of 1.00

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The design technique or fundamental layout of a circuit is its Select one: a. prototype b. foldback c. topology d. headroom Clear my choice Question 33 Not yet answered Marked out of 1.00

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DC-DC converters are packaged as a complete component and are referred to as Answer bricks Question

34

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An advantage of a class B amplifier is Select one: a. simplicity of design b. higher stage efficiency c. that RF tuned circuits are used d. that current flows for the entire ac cycle Clear my choice Question 35 Not yet answered Marked out of 1.00

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The most widely used IC regulators are those with only three pins: one for the unregulated input voltage, one for the regulated output voltage, and one for ground. Select one: a. False b. True

Clear my choice Question 36 Not yet answered Marked out of 1.00

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A Colpitts oscillator can be recognized by its Select one: a. tickler coil secondary b. three lead circuits c. inductive voltage divider d. capacitive voltage divider Clear my choice Question 37 Not yet answered Marked out of 1.00

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IGBTs are effective solutions for Select one: a. low voltage and current applications at high frequencies b.

low voltage and current applications at moderate frequencies c. high voltage and current applications at low frequencies d. high voltage and current applications at moderate frequencies Clear my choice Question 38 Not yet answered Marked out of 1.00

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Using modern high frequency, high power Answer , output powers of several hundred watts are possible at frequencies well into the several hundred megahertz range. MOSFETs Question 39 Not yet answered Marked out of 1.00

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An amplifier whose input is typically a radio tuner or CD player and produces a larger output suitable for driving tone and volume controls is a Select one: a. tuned amp b. power amp

c. dc amplifier d. preamp Clear my choice Question 40 Not yet answered Marked out of 1.00

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Improved series regulators use positive feedback in a closed loop control circuit to greatly improve regulation. Select one: a. False b. True Clear my choice Question 41 Not yet answered Marked out of 1.00

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Class C operation means the collector current Select one: a. flows for less than half of the cycle

b. flows for half the cycle c. does not flow at all d. flows for 360 degrees of the ac cycle. Clear my choice Question 42 Not yet answered Marked out of 1.00

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What type of amplifier produces output power ranging from a few hundred milliwatts up to hundreds of watts? Select one: a. RF tuned amplifier b. power amplifier c. preamp d. dc amplifier Clear my choice Question 43 Not yet answered Marked out of 1.00

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Which of the following does not affect the quality of a power supply? Select one: a. input resistance b. line regulation c. output resistance d. load regulation Clear my choice Question 44 Not yet answered Marked out of 1.00

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A hybrid device that combines the low conduction loss of a BJT with the switching speed of a power MOSFET is a Select one: a. diac b. D-MOSFET c. SCR d. IGBT Clear my choice

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With audio amplifiers, the output impedance is usually less than Answer

ohms.

50 Question 46 Not yet answered Marked out of 1.00

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An amplifier circuit that uses two transistors with one conducting for half a cycle while the other is off, and vice versa is called a Select one: a. push-push amplifier b. dual transistor amplifier c. push-pull amplifier d. complementary amplifier Clear my choice Question 47 Not yet answered Marked out of 1.00

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What is exhibited when an ac voltage placed across a crystal causes it to vibrate at the frequency of the applied voltage? Select one: a. the piezoelectric effect b. a modulating signal c. a fundamental frequency d. a harmonic frequency Clear my choice Question 48 Not yet answered Marked out of 1.00

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PWM is that technique of generating a sine wave with a varying frequency and a varying duty cycle. Select one: a. True b. False Clear my choice

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A frequency change of an oscillator over time caused by temperature, aging, and other causes is referred to as Select one: a. shift b. resonance c. drift d. modulation Clear my choice Question 50 Not yet answered Marked out of 1.00

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A technique that is widely used to boost amplifier output with low voltage is to use what is called a Answer amplifier. bridge UGRD-ECE6203-2113T Question

1

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Question text An advantage of a class B amplifier is Select one: a. that current flows for the entire ac cycle b. higher stage efficiency c. that RF tuned circuits are used d. simplicity of design Question 2 Complete Mark 1.00 out of 1.00

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Question text When a transistor circuit operates as a class B amplifier Select one: a. the output is an exact reproduction of the input b. one half cycle is clipped off c. most of the cycle is clipped off d. there is no distortion Question 3 Complete Mark 1.00 out of 1.00

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Question text A power amplifier produces output power ranging from a few hundred milliwatts up to hundreds of watts. Select one: a. True b. False Question 4 Complete Mark 1.00 out of 1.00

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Question text The amplifier that precedes the output stage is referred to as the Select one: a. tuned tank b. power amplifier c. preamp d. driver Question 5 Complete Mark 1.00 out of 1.00

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Question text A radio frequency amplifier is one that amplifies frequencies above 20 kHz. Select one: a. False b. True Question 6 Complete Mark 1.00 out of 1.00

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Question text The power rating of a transistor can be effectively increased by Select one: a. using heat sinks b. using bigger transistors c. reducing power supply voltages d. using slow-blow fuses Question 7 Complete Mark 1.00 out of 1.00

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Question text An amplifier that operates in the range of 20 Hz to 20 kHz is a

Select one: a.

audio amplifier b. narrowband amplifier c. tuned amplifier d. wideband amplifier Question 8 Complete Mark 1.00 out of 1.00

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Question text With switching amplifiers, efficiencies of Select one: a. approximately 20% are common place b. approximately 50% are common place c. 70% or greater are common place d. less than 10% are common place Question 9 Complete Mark 1.00 out of 1.00

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Question text Matching impedances provides Answer to the speaker. maximum Question

10

maximu

power transfer from the amplifier

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Question text When a transistor operates as class B, it clips off half a cycle. Select one: a. True b. False Question 1 Not answered Marked out of 1.00

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Question text An amplifier's power gain equals Select one: a. ac output power divided by the ac input current b. ac input power divided by the ac output power c. ac output power divided by the power supply voltage d. ac output power divided by the ac input power Question 2 Not answered Marked out of 1.00

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Question text An amplifier that is designed to work over a small range of frequencies is classified as Select one: a. small range b. RF c. narrowband d. audio Question 3 Not answered Marked out of 1.00

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Question text In an amplifier, the dc current is referred to as the Select one: a. current drive b. constant current source c. current drain d. current pump Question 4 Not answered Marked out of 1.00

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With audio amplifiers, the output impedance is usually less than Answer ohms. 50 Question 5 Not answered Marked out of 1.00

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Question text Harmonics are Select one: a. circuits used in audio amplifiers b. equations used in amplifier design c. instruments that provide sounds with metal reeds d. multiples of a frequency multiples of a frequency Question 6 Not answered Marked out of 1.00

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Question text High power integrated circuit amplifiers are designed to use large metal Answer sinks. heat Question 7 Not answered Marked out of 1.00

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Question text An amplifier circuit that uses two transistors with one conducting for half a cycle while the other is off, and vice versa is called a Select one: a. push-push amplifier b. complementary amplifier c. dual transistor amplifier d. push-pull amplifier Question 8 Not answered Marked out of 1.00

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Question text A transformer can be used to match the impedance of a speaker to the higher impedance of a class A amplifier. Select one: a. False b. True Question 9 Not answered Marked out of 1.00

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Question text The gain of a typical audio amplifier is usually in the Select one: a. 100 to 200 dB range b. 10 to 20 dB range c. 20 to 50 dB range d. 60 to 100 dB range Question 10 Not answered Marked out of 1.00

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Question text Switching amplifiers use which type transistors to provide linear amplification for audio applications? Select one: a. JFETs b. MOSFETs c. UJTs d. BJTs Question 1 Not answered Marked out of 1.00

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Question text The voltage gain of an emitter-follower is approximately Answer one Question 2 Not answered Marked out of 1.00

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Question text Class C operation means the collector current Select one: a. flows for less than half of the cycle b. flows for half the cycle c. does not flow at all d. flows for 360 degrees of the ac cycle. Question 3 Not answered Marked out of 1.00

.

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Question text In an amplifier circuit, an inductor replacing a collector resistor is often called a radio frequency choke. Select one: a. False b. True Question 4 Not answered Marked out of 1.00

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Question text The Answer amplifier has emerged as the clear winner over more traditional class A and AB amplifiers. switching Question 5 Not answered Marked out of 1.00

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Question text Which classes of switching amplifiers are used in RF applications?

Select one: a. E and F b. A and D c. A and B d. C and D Question 6 Not answered Marked out of 1.00

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Question text An ampli...