ATT TEST 6 Questions & Answers | Already Passed 2024, Exams of Physics

Download ATT TEST 6 Questions & Answers | Already Passed 2024 and more Exams Physics in PDF only on Docsity! ATT TEST 6 Questions & Answers | Already Passed 2024 What is the purpose of a sine wave oscillator? - ✔✔Convert DC Energy to sinusoidal AC Energy. What is the purpose of a Hartley Oscillator? - ✔✔Convert DC Energy to sinusoidal AC Energy. What is the purpose of a colpitts oscillator? - ✔✔Convert DC Energy to sinusoidal AC Energy. What is the purpose of a RC phase shift oscillator? - ✔✔Convert DC Energy to sinusoidal AC Energy. What is the purpose of a crystal oscillator? - ✔✔Convert DC Energy to sinusoidal AC energy. What is the purpose of a sawtooth generator? - ✔✔Convert square wave energy to a sawtooth waveform. The FET is a . - ✔✔Unipolar Device The element that current carries enter the FET through is called? - ✔✔Source The element that current carriers leave through is called? - ✔✔Drain The flow of current carriers through the FET is controlled by this element. - ✔✔Gate What is the most common fault in a FET amplifier? - ✔✔A failed semiconductor component. What is it called when current flow remains constant? - ✔✔Saturation What are the 4 steps to troubleshoot an amplifier? - ✔✔(1.) Determine amplifier operation (2.) Determine if Vcc is present (3.) Determine if FET is good (4.) Isolate problem to bias circuit How is a Hartley Oscillator identified? - ✔✔They have two inductors in the feedback circuit. How is frequency determined in a Hartley Oscillators? - ✔✔The values of the components in the feedback circuit determine the frequency. How is a colpitts oscillator identified? - ✔✔Two capacitors in the feedback circuit. How is frequency determined in a colpitts oscillator? - ✔✔Frequency is determined by the components in the feedback circuit. (2.) Reverse bias the source to gate PN junction to control current flow. The action of converting detected intelligence into sound waves that a human can hear. - ✔✔Reproduction The action of separating the low frequency intelligence from the high frequency carrier. - ✔✔Detection The ability of the receiver to isolate one station's frequency from the many frequencies present at the antenna. - ✔✔Selection Occurs when a transmitted electromagnetic wave passes through the receiver's antenna. - ✔✔Reception What are AM receivers? What does the AM broadcast band cover? - ✔✔AM receivers are electronic devices that pick up signals sent from AM transmitters. Frequencies go from 535 KHz to 1605 KHz Which is the most widely used FET? - ✔✔Common Source What is Calculated Av? - ✔✔Gm*Rd What are common gate FET normally used as? - ✔✔Switch What are Common Source and Common Drain FETs normally used for? - ✔✔Amplifiers Forward biased measurements indicate what? - ✔✔Normal resistance reading is low. A high reading indicates an Open FET. Reversed biased measurements indicate what? - ✔✔Normal resistance measurement is high. A low reading indicates a shorted FET. With the diode test function, how many directions should current flow? - ✔✔One What is Amplitude Modulation? - ✔✔Occurs when the carrier frequency is altered in the amplitude by the lower intelligence frequency. How many circuits do the turner block contain? What does each one do? - ✔✔Tuner contains 3 circuits. (RF Amplifier- selects and amplifies one frequency from the many picked up by the antenna. Local Oscillator- produces a frequency 455 KHz above the selected RF. Mixer- produces four frequencies) What is LO, RF, LO+RF, and LO-RF? - ✔✔LO Frequency- 455 KHz LO+RF- Adds 455 KHz to the RF. RF- Given number LO-RF- is also referred to as the intermediate frequency (IF). The transistors in a Multivibrator are biased so.... - ✔✔That they are either in cutoff or saturation. When a transistor in a Multivibrator is ON, it's output voltage is . - ✔✔LOW In a Multivibrator, what is meant by a transistor being on? - ✔✔The transistor is in saturation. Free running Multivibrators generate a square wave output.... - ✔✔Anytime the operating voltage is applied. In an astable Multivibrator, what determines which transistor turns ON when power is first applied? - ✔✔The transistor that conducts first. What type of operation does a monostable Multivibrator use? - ✔✔Triggered What is the frequency of any monostable Multivibrator? - ✔✔The same as the input The frequency of an monostable Multivibrator is determined by . - ✔✔The input trigger frequency Decreasing Reverse Bias of VGS... - ✔✔Increases Id Positive Bias Voltage (VDD) is applied to the... N Channel FET - ✔✔The Drain Positive Bias Voltage on the Drain produces... N Channel FET - ✔✔Current flow Bias Voltage (VGG) is applied to the _. - ✔✔Negative/Gate A Negative Bias Voltage (VGG) on the Gate creates a in the FET. - ✔✔Barrier An Increase Negative Gate Voltage (VGG) causes... - ✔✔An increase in PN Junction Barrier. An increase in PN Channel Barrier causes... - ✔✔A decrease in Source-To- Drain Current. JFET Cutoff happens when... - ✔✔Negative Gate Voltage (VGG) increases to the point of no electron flow. N Channel is made up of... - ✔✔A bar of N type Material with two island P Type Material. A P Channel FET is made up of... - ✔✔A bar of P Type of Material with two island N Type Material. selects and amplifies one frequency from the many picked up by the antenna. - ✔✔RF Amplifier Local Oscillator - ✔✔produces a frequency 455 KHz above the selected RF Mixer - ✔✔produces four frequencies