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A comprehensive set of questions and answers for an electronics test. It covers various topics, including amplifiers, capacitors, inductors, transformers, and transistors. Valuable for students preparing for an electronics test, as it offers a thorough review of key concepts and provides correct answers to common test questions.
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What type of amplifier configuration has the input applied to the emitter and the output taken from the collector? ---------CORRECT ANSWER-------------- ---Common Base (T/F) Transformers can reverse the phase of the applied AC voltage or sine wave. ---------CORRECT ANSWER-----------------True What is the basic unit of capacitance? ---------CORRECT ANSWER----------- ------The Farad (F) What is the ability of a capacitor to store a charge? ---------CORRECT ANSWER-----------------Capacitance What is the numerical value given to the Di-electric material of the capacitor? ---------CORRECT ANSWER-----------------Di-electric constant What is the ability of the magnetic field of one coil to induce voltage in a second coil? ---------CORRECT ANSWER-----------------Mutual Inductance What removes signal voltages above or below a specific level? --------- CORRECT ANSWER-----------------Limiters
When current flows through a coil what is developed? ---------CORRECT ANSWER-----------------A magnetic field Step up transformers produce? ---------CORRECT ANSWER-----------------A higher Es than Ep Reverse the phase of the applied AC voltage or sine wave is called? --------
Frequency counters determine the ______________. ---------CORRECT ANSWER-----------------Period of one cycle in a signal The basic unit of inductance ______________. ---------CORRECT ANSWER-----------------Henry (H) An open in the primary of a transformer ______________. --------- CORRECT ANSWER-----------------No current flow in the secondary The inductor is used to ____________. ---------CORRECT ANSWER--------- --------Concentrate a magnetic field What adds a DC voltage to the AC input signal? ---------CORRECT ANSWER-----------------Clampers An open in the secondary of a transformer prevents an output voltage in ________________. ---------CORRECT ANSWER-----------------The open secondary What occurs when windings in the primary or secondary coils allow an alternate low resistance path for current flow. ---------CORRECT ANSWER- ----------------Shorts N type material has _____________. ---------CORRECT ANSWER------------ -----Free electrons
Two common inductor cores are _____________. ---------CORRECT ANSWER-----------------Air and iron The purpose of a transformer is to? ---------CORRECT ANSWER-------------- ---Control signals What reduces the number of turns in the coil? ---------CORRECT ANSWER- ----------------Short What are shorts across the entire winding? ---------CORRECT ANSWER---- -------------Complete shorts If the ______________ has a short the output voltage increases. --------- CORRECT ANSWER-----------------Primary The physical appearance of inductors _____________. ---------CORRECT ANSWER-----------------Varies Inductors have the value of their inductive capacity indicated by ______________. ---------CORRECT ANSWER-----------------Print or color code on the body of the inductor Inductors are commonly identified by their ______________. --------- CORRECT ANSWER-----------------Core type
In an NRN transistor, the base DC bias voltage must be _______. --------- CORRECT ANSWER-----------------Positive compared to the emitter Which amplifier has the best efficiency? ---------CORRECT ANSWER-------- ---------Class C Electrolytic capacitors are ____________. ---------CORRECT ANSWER----- ------------Polarized What are the dielectric types used by capacitors? ---------CORRECT ANSWER-----------------Electrolytic, ceramic, and film When an input is applied across the emitter to base PN junction, what is the relative resistance? ---------CORRECT ANSWER-----------------Low When an input is applied across the collector to base PN junction, what is the relative resistance? ---------CORRECT ANSWER-----------------High Alpha is the ratio of ________________. ---------CORRECT ANSWER------- ----------Ic to Ie (Ic/Ie) The point when Ic no longer increases although base bias voltage increases is called? ---------CORRECT ANSWER-----------------Saturation
The point where Ib and Ic stop is called? ---------CORRECT ANSWER------- ----------Cutoff What happens in a transistor when the saturation point is reached? --------- CORRECT ANSWER-----------------Ic stops increasing Capacitors are identified by their _______________. ---------CORRECT ANSWER-----------------The type of dielectric used What happens in a transistor when base voltage reverse biases the emitter to base PN junction? ---------CORRECT ANSWER-----------------Cutoff occurs The purpose of an _____________ is to increase signal strength. --------- CORRECT ANSWER-----------------Amplifier Transistor amplifiers require what type of signals to functions? --------- CORRECT ANSWER-----------------DC bias and AC input signals What amplifiers are biased so the input signal occurs within the limits of cutoff and saturation? ---------CORRECT ANSWER-----------------Class A What changes are necessary for amplification to occur? ---------CORRECT ANSWER-----------------Small change in Eb and large change in Ic
What are oscilloscopes used to measure? ---------CORRECT ANSWER----- -------------Wave shape
The type of biasing that compensates for temperature changes, but decreases Beta is called ________________. ---------CORRECT ANSWER-----------------Self biasing Transistor amplifiers operate by AC input signal changing the ____________. ---------CORRECT ANSWER-----------------Base Bias _______________ is calculated by measuring from the zero base line to the most positive or negative point of the sine wave. ---------CORRECT ANSWER-----------------Peak voltage The primary characteristic of the diode can be described as? --------- CORRECT ANSWER-----------------Changing AC current flow to DC current flow _______________ is calculated by measuring from the most positive to the most negative point of the sine wave. ---------CORRECT ANSWER------------ -----Peak to Peak What is the amount by which wave-forms lead or lag one another? --------- CORRECT ANSWER-----------------Phase angle Which amplifier configuration has the best properties for an amplifier? ------- --CORRECT ANSWER-----------------Common emitter
What is a function generator used for? ---------CORRECT ANSWER---------- -------Producing AC signals The time it take to complete one cycle is called ____________. --------- CORRECT ANSWER-----------------Period What is the reference designator for the inductor? ---------CORRECT ANSWER-----------------L What is a component that has the ability to concentrate a magnetic field? -- -------CORRECT ANSWER-----------------The inductor To induce voltage in an inductor, the current flow must be? --------- CORRECT ANSWER-----------------Increasing or decreasing The physical appearance of capacitors ____________. ---------CORRECT ANSWER-----------------Varies What type of current carriers are in N type material? ---------CORRECT ANSWER-----------------Electrons In and inductor: open switch Induced voltage ____________ and total circuit current _____________. -- -------CORRECT ANSWER-----------------Decreases
The output of a transformer is taken from the ____________. --------- CORRECT ANSWER-----------------Secondary Capacitors are identified by which two variables? ---------CORRECT ANSWER-----------------Farads and voltage In and inductor: closed switch Induced ____________ decreases and total ____________ increases. ----- ----CORRECT ANSWER------------------Voltage
What are general purpose capacitors used to isolate one circuit from another, block unwanted signals and produce wave shapes? --------- CORRECT ANSWER-----------------Non-polarized capacitors What capacitor is polarity sensitive? Major use is filtering power supplies. -- -------CORRECT ANSWER-----------------Electrolytic capacitor What provides varying amounts of capacitance? Used in transmitters and receivers. ---------CORRECT ANSWER-----------------Variable capacitor What does the N indicate in the identification number 1N34A? --------- CORRECT ANSWER-----------------A solid state device What is the purpose of a transformer? ---------CORRECT ANSWER----------- ------Transfer power Transformers operate on the principle of _________. ---------CORRECT ANSWER-----------------Mutual inductance The input to a transformer is applied to one coil called _____________. ---- -----CORRECT ANSWER-----------------Primary What is from a power source to a load or from one circuit to another? --------
The output of a transformer is taken from the other coil which is called ______________. ---------CORRECT ANSWER-----------------Secondary What transformers are mostly used in power supplies? ---------CORRECT ANSWER-----------------Iron core What transformer are often used in radio circuits? ---------CORRECT ANSWER-----------------Air core A complete short in the secondary of transformer ____________. --------- CORRECT ANSWER-----------------Eliminates secondary voltage Where is the capacitor charge stored? ---------CORRECT ANSWER---------- -------In an electrostatic field between the plates ____________ in the secondary eliminates the output voltage. --------- CORRECT ANSWER-----------------Complete shorts The unit of measure for inductors is the _________. ---------CORRECT ANSWER-----------------Henry (H) What type of materials have holes? ---------CORRECT ANSWER-------------- ---P type
Any voltage less than _________ will keep the silicon diode from conducting. ---------CORRECT ANSWER-----------------.7 volts What is made from semiconductor materials that have the properties of conductors and insulators? ---------CORRECT ANSWER----------------- Diodes In a diode current flows in what direction? ---------CORRECT ANSWER------ -----------1 Direction Current flows from the __________ to the anode, but not from the ______ to the cathode. ---------CORRECT ANSWER-----------------Cathode Aniode