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A comprehensive set of questions and answers related to electronics, focusing on transistor circuits and components. It covers topics such as transistor types, biasing, amplification, capacitors, inductors, and transformers. Designed to help students understand and learn key concepts in electronics.
Typology: Exams
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Which element in a translate is used to produce a large number of current carriers? - CORRECT-ANSWER--Emitter An open is the primary of a transformer causes no output voltage because _______________. - CORRECT-ANSWER--The open prevents magnetic fields from developing The most common faults found in transformers are ____________. - CORRECT-ANSWER--Shorts and opens
Which element in a transmitter is used to pass most of the current carriers? - CORRECT-ANSWER--Base 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 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 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 What amplifiers are biased so collector current is zero for half, (one alteration) of the input signal? - CORRECT-ANSWER--Class B What amplifiers are biased so that collector current is zero for a portion of one alteration? - CORRECT-ANSWER--Class AB What amplifiers are biased so that collector current is zero for most of the input cycle? - CORRECT-ANSWER--Class C ___________ an amplifier distorts the output signal. - CORRECT-ANSWER--Overdriving
Which amplifier has best fidelity? - CORRECT-ANSWER--Class A In which direction do holes appear to move? - CORRECT- ANSWER--Opposite of electrons Which quantity cannot be measured directly or derived using an oscilloscope? - CORRECT-ANSWER--Resistance What value of AC voltage does an oscilloscope directly measure? - CORRECT-ANSWER--Peak to peak What are oscilloscopes used to measure? - CORRECT-ANSWER--
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 The phase angle of two wave-forms is expressed using two vectors called _____________. - CORRECT-ANSWER--Phasors When forward biased the diode acts as a? - CORRECT-ANSWER-
Combining harmonic frequencies with the fundamental frequency produces ___________. - CORRECT-ANSWER--Non- sinusoidal wave-forms The _____________ is referred to as the linear increase or decrease. - CORRECT-ANSWER--scope What is from a power source to a load or from one circuit to another? - CORRECT-ANSWER--The power transfer 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 What type of amplifier configuration has the input applied to the emitter and the output taken from the collector? - CORRECT-ANSWER--Common Base
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 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 (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
Most of the current carriers in a commonly biased transistor flow from the _____________. - CORRECT-ANSWER--Emitter to the collector Frequency generators are used to ____________. - CORRECT- ANSWER--Provide known signals to check circuit operation The frequency switches of counter select between ________________. - CORRECT-ANSWER--Check, totalize, period, and frequency ranges What is the ATTENUATION control used for a frequency counter? - CORRECT-ANSWER--Reduces the input signal by a factor of 20 What compares the number of turns in the primary to the number of turns in the secondary? - CORRECT-ANSWER--Turns in ratio What is inverse of both voltage and the turns ratio in transformers? - CORRECT-ANSWER--Current ____________ 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 The type of biasing that compensates for the temperature changes, but decreases Beta is called _____________. - CORRECT-ANSWER--Self-biasing Class A amplifiers have good ___________. - CORRECT- ANSWER--Fidelity What occurs when there is a break in primary or secondary coil of the transformer? - CORRECT-ANSWER--Opens Frequency counters determine the ______________. - CORRECT-ANSWER--Period of one cycle in a signal The basic unit of inductance ______________. - CORRECT- ANSWER--Henry (H)
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
If the ____________ has a short the output voltage decreases. - CORRECT-ANSWER--Secondary The capacitor is used to _____________. - CORRECT-ANSWER-- Stores an electrical charge A partial short in the primary of a transformer... - CORRECT- ANSWER--Increases secondary voltage 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 What has four electrons in their outer most orbit? - CORRECT- ANSWER--Pure semiconductors Adding impurities called ___________ increases the conduction of semiconductors. - CORRECT-ANSWER--Doping
