ETA CET Exam 382 Questions with Verified Answers,100% CORRECT

ETA CET Exam 382 Questions with Verified Answers The resistance of a component at a given frequency - CORRECT ANSWER What is impedance? Diode - CORRECT ANSWER A two terminal device that conducts in only one direction. Printed Circuit Board - CORRECT ANSWER Insulating board containing conductive tracks for circuit connections. Capacitor - CORRECT ANSWER An electrical device used to store electrical charge. 1996 - CORRECT ANSWER When did the ETA initiate renewal? False - CORRECT ANSWER all ETA certifications require the passage of the associate CET exam? False - CORRECT ANSWER to qualify for master CET status, the examinee must attain a score of 85% on each separate exam? 50 - CORRECT ANSWER The coaxial cable leading to a cable TV is a 75 ohm transmission line. If you use 10Base2 coax cable for networking, that is a _____ ohm transmission line. false - CORRECT ANSWER an associate CET cannot attempt one of the specialty exams? true - CORRECT ANSWER renewal requires payment of a fee and retesting or providing at least 40 hours of upgrade training within a 4 year period? true - CORRECT ANSWER a worker may become certified by ETA as a CST without also becomming certified as a CET? +12V to 300V DC - CORRECT ANSWER B+, or supply voltages in electronics products are considered to be: 500 microamps - CORRECT ANSWER leakage current in an electronic product, between either of the AC power cord conductors and the chassis or any other exposed metal parts should not exceed: false - CORRECT ANSWER the associate CET exam may be taken after the journeyman exam? only exact replacement parts may be used - CORRECT ANSWER shaded components on electronic schematics mean: are toxic - CORRECT ANSWER ingested solder fumes or particles_____ not be treated with ice and bandage pack - CORRECT ANSWER second degree skin burns should ______ CMOS semiconductors - CORRECT ANSWER ESD and static discharge is most destructive to: should not attempt it, but call for help - CORRECT ANSWER if you have never recieved formal training and practiced cpr on a person or dummy, in the event of finding a fellow worker not breathing, you_________. full body harness attached to a lanyard which prevents more than a 6' drop. - CORRECT ANSWER when working at heights above 6 feet, a _____ is required by OSHA rules. The transfer of energy from one circuit to another circuit by electromagnetic induction - CORRECT ANSWER What is meant by "transformer action"? charge retained by capacitors. - CORRECT ANSWER residual voltage is associated with ______. Electrostatic Discharge - CORRECT ANSWER What does the acronym ESD stand for? 100mA, 200mA - CORRECT ANSWER Current amounts between ______ and _____ can be lethal. Shock - CORRECT ANSWER What is the number one concern in regards to electrical safety? Protons, neutrons and electrons - CORRECT ANSWER Bohr's Atomic Model consists of what three components? shells - CORRECT ANSWER Electrons are arranged in _____ around a nucleus. Conductors, semi-conductors and insulators - CORRECT ANSWER What are three types of materials used in electronics? A, B, C, D, K. - CORRECT ANSWER In the United States there are five common classifications of fires, which are: directly proportional, inversely proportional - CORRECT ANSWER Coulomb's Law describes the forces of attraction or repulsion between electrical charges, which are ______________ to the product of the charges ______________ to the distance between them. lines of flux. - CORRECT ANSWER The magnetic field that surrounds a magnet can best be described as invisible lines of force, and are commonly referred to as: voltage, current and resistance. - CORRECT ANSWER An analog multimeter (AMM) checks for: dual-trace - CORRECT ANSWER An oscilloscope with two vertical inputs, is commonly referred to as a _______ oscilloscope. voltage drop. - CORRECT ANSWER Voltage or potential difference is the measure of potential energy between two points in a circuit and is commonly referred to as: Inductor - CORRECT ANSWER What components value is measured in millihenries? power, resistance, current and voltage. - CORRECT ANSWER Ohm's Law characterizes the relationship between: 210 Ohms - CORRECT ANSWER A resistor has three color bands of red, brown and brown. What is the ohmic value of this resistor? Voltage times current - CORRECT ANSWER Ohm's Law states that resistance is calculated by voltage divided by current. Using Ohms law, how do you determine power? the sum of all the resistor values within the circuit. - CORRECT ANSWER Total resistance in a series circuit equals: 333.33uA - CORRECT ANSWER If a series circuit has three resistors valued at 10k Ohms, 15k Ohms and 20k Ohms, with a voltage source of 15V, the total current will be_____. inversely proportional to the circuits resistance. - CORRECT ANSWER Current in a parallel circuit is: 669.29 Ohms - CORRECT ANSWER With three 2.5k resistors and one 3.4k resistor in parallel, the total resistance is: 20 Ohms - CORRECT ANSWER With one series 8 Ohm resistor connected to two in-parallel resistors, 20 and 30 ohms respectively, what is the total resistance (Rt)? 50 - CORRECT ANSWER Given a battery rated at 350 ampere-hours how many hours will the battery be able to provide 7 amperes? frequency, period, wavelength and amplitude. - CORRECT ANSWER The basic properties associated with alternating voltage and current are: Square - CORRECT ANSWER In an inductor/coil inductance varies as the _______ of the number of turns. NEC article 770 - CORRECT ANSWER rules describing the fire or toxicity retardant types of cabling which may be installed in buildings is contained in: signal matching and power supplies. - CORRECT ANSWER Two basic uses for transformers are: Primary winding, secondary winding and core - CORRECT ANSWER What are the three basic parts of a transformer? a time constant. - CORRECT ANSWER The time required to charge a capacitor to 63 percent is known as: 40.21 Ohms 6.28 x frequency x capacitor 1/the sum from above 6.28 x 440 = 2763.2 2763.2 x .000009 = .0248688 1/.0248688 = 40.21 - CORRECT ANSWER Calculate the capacitive reactance for 440 Hz and 9μF. 90 degree - CORRECT ANSWER In a resistive-capacitive circuit the vector line relationship shows two lines perpendicular to each other. What is the phase relationship? Voltage lags ELI the ICE man!!! ELI Inductive circuit...... Voltage arrives before Current ICE Capacitive circuit... Current arrives before Voltage - CORRECT ANSWER In a capacitive circuit, what is the voltage and current relationship? decrease - CORRECT ANSWER When the frequency of an applied voltage is increased the capacitive reactance of a circuit will: A series impedance calculation is derived from resistance and reactance, while parallel impedance is calculated with resistive and reactive current divided into the source voltage - CORRECT ANSWER What is the difference between calculating impedance for a series AC circuit and a parallel AC circuit? characteristic impedance - CORRECT ANSWER Each type of coaxial cable is designed with_____________, which is dependent on materials and dimensions used. Dielectric constant and permeability - CORRECT ANSWER A coaxial cable's velocity of propagation factor depends on what two factors? Z =sqrt( R2 + X2) - CORRECT ANSWER In a series resistive and reactive circuit what formula is used to find total impedance? .7V - CORRECT ANSWER Silicon diodes have an approximate voltage drop of: A 16 AWG - CORRECT ANSWER In regards to AWG standards, which gauge of wire has a bigger crosssectional area? A. 16 AWG B. 18 AWG C. 20 AWG D. 24 AWG High input impedance - CORRECT ANSWER What is a primary advantage of a FET when compared to the bipolar transistor? reverse - CORRECT ANSWER Zener diodes are designed to operate in the _____ bias region. Gate - CORRECT ANSWER When compared to a JFET, the base of a bipolar transistor is similar to what element of the JFET? Gate, source, drain and substrate - CORRECT ANSWER A MOSFET is comprised of what four elements? One - CORRECT ANSWER How many PN junctions does a Unijunction transistor have? 4,3 - CORRECT ANSWER A thyristor is a semiconductor with _____ layers that form ____ PN junctions. 50% - CORRECT ANSWER If a signal decreases by 3 dB, how much power is lost? .5mW - CORRECT ANSWER -3dBm is equal to how many milliwatts? 10 log10( P / 1mW) - CORRECT ANSWER The formula to calculate dBm from mW is: regenerative feedback. - CORRECT ANSWER The split capacitors in a Colpitts oscillator provide: When keeping frequency error or drift at a minimum is important - CORRECT ANSWER Why are crystal oscillators preferred over other types of oscillators? To produce a sharp spike - CORRECT ANSWER Why is a differentiator used at the input of a flip-flop? Place a swamping resistor across the transformer - CORRECT ANSWER What is one way to minimize parasitic oscillations? true - CORRECT ANSWER master CET is lifetime and does not require re certification? collector current flows for less than one half cycle of the input signal. (180°) - CORRECT ANSWER In a class 'C'collector: 16 - CORRECT ANSWER What is the radix of the hexadecimal number system? 26E - CORRECT ANSWER What is the hexadecimal equivalent of the decimal number 622? 43 - CORRECT ANSWER What is the decimal sum of 10010 and 11001? Electrically Alterable Read Only Memory - CORRECT ANSWER What does the acronym EAROM stand for? Arithmetic logic, interfacing and control - CORRECT ANSWER What are three processor functions of a CPU? 1.6 microseconds - CORRECT ANSWER If an oscilloscopes TIME/DIV is set at .2 microseconds, and the width of the pulse measured is at 8 divisions on the scope graticule, what is the pulse width? To prevent the formation of metal oxides at extreme temperatures - CORRECT ANSWER Why is flux used when soldering? 361 degrees F - CORRECT ANSWER Lead and tin solder at a respective percentage of 63/37 melts at ______: Direct, RC, impedance and transformer coupling - CORRECT ANSWER What four methods are used in coupling amplifier stages? Vout = (Rf/Rin)(V2 - V1) - CORRECT ANSWER What formula is used to calculate output voltage of a Difference operational amplifier? dB=10*log(P1/P2) - CORRECT ANSWER When calculating power levels(in db), which formula is correct? Pi, capacitive, inductive - CORRECT ANSWER Due to the configuration of the filtering components, the ability of a_____ type filter to remove ripple voltage is superior to that of either the _______ or ________ filter. Schematic - CORRECT ANSWER What type of diagram shows electrical connections and functions of a specific circuit arrangement? 7,000V - CORRECT ANSWER Opening and closing vinyl envelopes used to carry work instructions, with 10-20% relative humidity, electro-static voltages can reach as high as: 32 - CORRECT ANSWER What is the modulus of a five-stage binary counter? negative - CORRECT ANSWER electron has a ______ charge Motorized vacuum extraction - CORRECT ANSWER What is the preferred method for removing solder from a component attached to a circuit card assembly (CCA)? time-division multiplex - CORRECT ANSWER To overcome noise, distortion and cost of maintenance in frequency division multiple systems, ________ systems were developed. Local exchange carrier - CORRECT ANSWER What does LEC stand for? one - CORRECT ANSWER Circuit switch networks maintain only _____ path(s) for the duration of the call. FDMA, CDMA and TDMA - CORRECT ANSWER What are the three fundamental types of wireless access technologies? current, amplitude - CORRECT ANSWER In the kinescope, the ________ intensity of an electron beam from an electron gun is modulated in accordance with the ________ variations of signals received by a control electrode, or modulator. 90 degree - CORRECT ANSWER A vertically polarized antenna has a magnetic field that is at a _____ angle to the axis of the antenna. 70 MHz - CORRECT ANSWER The 4-meter frequency band is also known as the _____ band. Cathode - CORRECT ANSWER In a common anode, seven-segment LED display, an individual LED will light if a negative voltage is applied to what element? .12 ohms - CORRECT ANSWER a cell with an EMF of 1.8V delivers a current of 2.5A through an external resistance of 0.6ohms. calculate the internal resistance: 1.8V/2.4A=.72ohm -the .6ohm resistance known .707 of peak voltage - CORRECT ANSWER RMS of a waveform is: 339.4V - CORRECT ANSWER the RMS value of a 60Hz sine wave voltage is 120V. what is peak to peak? 1.414 x RMS - CORRECT ANSWER peak voltage from RMS (of a wave form) 16.6ms (1 divided by the frequency) - CORRECT ANSWER a sine wave has a frequency of 60Hz, find the period 1/F - CORRECT ANSWER to find period (time) from frequency 1/T - CORRECT ANSWER to find frequency from time (period) opposes/change - CORRECT ANSWER a capacitor in an electrical circuit ________ a ________ of voltage Farad - CORRECT ANSWER unit of capacitance Coulombs. - CORRECT ANSWER the charge stored in a capacitor is measured in Q = C x V Q = is the charge C = is the value of the capacitor in farads V = voltage - CORRECT ANSWER to find the charge of a capacitor 60 uColumbs 12 x .000005 = .00006 - CORRECT ANSWER a 12Vdc supply is connected across a capacitor of 5uF. Calculate the charge Joules E=0.5×C×V² - CORRECT ANSWER the energy stored in a capacitor is measured in E=0.5×C×V² E = energy in Joules C = is the capacitance in Farads V = Voltage - CORRECT ANSWER to find the energy stored in a capacitor 360 uJoules E=0.5C x V squared .5x.000005x12x12=.00036 - CORRECT ANSWER calculate the energy stored in a capacitor with 12Vdc and 5uF parallel series - CORRECT ANSWER capacitors in series are calculated like resistors in_____ capacitors in parallel are calculated like resistors in _______ 3.3uF - CORRECT ANSWER three 10uF capacitors are connected in series, whats total capacitance? 20uF - CORRECT ANSWER two 10uF capacitors are connected in parallel, whats total capacitance? R x C R = resistance C = capacitance - CORRECT ANSWER calculation for time constant 0.05sec R x C - CORRECT ANSWER a series RC circuit is connected across a 100Vdc suppply. If C = 5uf and R = 10Kohm calculate one time constant 63V - CORRECT ANSWER if 100V is the applied voltage, after one time constant, what approximate voltage should be across the capacitor series parallel - CORRECT ANSWER inductors in series are calculated like resistors in _____ inductors in parallel are calculated like resistors in _____ henry H math symbol (L) - CORRECT ANSWER the unit of inductance is 12mH - CORRECT ANSWER three, 4mh inductors are connected in series,calculate total inductance 1.3mH - CORRECT ANSWER three, 4mh inductors are connected in parallel,calculate total inductance 5 - CORRECT ANSWER a capacitor takes _____ time constants to be fully charged millivolts - CORRECT ANSWER a thermocoupler has an output in the range of: 1/ 6.28×Frequency×Capacitance (in farads) - CORRECT ANSWER calculation for capacitive reactance (Xc) positive - CORRECT ANSWER proton has a _______ charge neutral - CORRECT ANSWER neutron has a ______ charge false - CORRECT ANSWER the atomic number of an element is the same as the elements atomic weight. increase - CORRECT ANSWER an increase in voltage with resistant held constant causes current to __________ a unit of charge movement per second past a given point - CORRECT ANSWER the ampere expresses by dividing the resistance value of a branch by the number of branches - CORRECT ANSWER the total resistance of a parallel circuit containing equal branch resistances is found by: 15ohms - CORRECT ANSWER a 12Vdc power supply has a 15ohm internal resistance. what load resistance can be connected to transfer maximum power? true - CORRECT ANSWER maximum power transfer occures when the load impedance is equal to the source impedance? 2 amps - CORRECT ANSWER a series circuit has a 12v supply with a 6ohm resistor. what is the current? 24watts - CORRECT ANSWER a series circuit has a 12v supply with a 6ohm resistor. what is the dissipated power? current decreases - CORRECT ANSWER what will happen to the current through a resistor if the resistor value increases? parallel - CORRECT ANSWER which type of circuit has the same voltage drop across each component? 320 ohms - CORRECT ANSWER a resistor has color bands: orange, red , brown it is: 666 ohms - CORRECT ANSWER a circuit has one 500 ohm resistor in series with three 500 ohm resistors that are connected in parallel with each other. The total resistance would be? relates to the maximum voltage that should be applied to it - CORRECT ANSWER the voltage rating of a capacitor __________ is done by adding each of the capacitance values together - CORRECT ANSWER calculating the total capacitance of several capacitors connected in parallel is a common inductor core material - CORRECT ANSWER Ferrite the inductive property of a coil, or inductor that opposes the change of current. - CORRECT ANSWER the term Henry refers to: 0.2 - CORRECT ANSWER a certain transformer has a 250 turns in the primary winding and 1250 turns in the secondary winding. the turns ratio is: 0.8v - CORRECT ANSWER when the turns ratio of a transformer is 10 and the primary ac voltage is 8v, the secondary voltage is: red, violet, brown, gold - CORRECT ANSWER which color code patterns is found on a 270 ohm 5% resistor . - CORRECT ANSWER . 6.28 x frequency x L - CORRECT ANSWER calculation for inductive reactance (XL) 1/ 6.28 x frequency x C - CORRECT ANSWER calculate capacitive reactance (Xc) finding the net reactance and net resistance, square each seperately, add them together and then find the square root of the sum - CORRECT ANSWER total impedance in a series circuit is found by the voltages equal to each other - CORRECT ANSWER in a series AC circuit with a resistor, inductor and a capacitor, each with the same resistance or reactance, a voltmeter measuring each individual voltage drop would find? increase - CORRECT ANSWER in an AC circuit, as the applied voltage frequency changes upward, the inductive reactance in the circuit will decrease - CORRECT ANSWER in an AC circuit, as the applied voltage frequency increases the capacitive reactance in the circuit will 3140 ohms Xl= 6.28 x frequency x L (inductance) - CORRECT ANSWER a 50KHz AC voltage is applied to a 10mH inductor, its reactance at this frequency is 15.9 ohms Xc= 1/6.28 x frequency x C (capacitance) - CORRECT ANSWER a .1uF capacitor in a circuit with a frequency of 100KHz applied has a reactance of minimum - CORRECT ANSWER in a series circuit when the inductive reactances equal the capacitor reactances the circuit has _________ impedance maximum - CORRECT ANSWER in a parallel circuit when the inductive reactances equal the capacitor reactances the circuit has _________ impedance the total of the inductive reactances in the circuit equal the total of all capacitive reactances - CORRECT ANSWER Resonance is when _______ the field, the armature, the slip rings and brushes - CORRECT ANSWER the basic compnents of an alternator are __________ 120 degrees - CORRECT ANSWER three phase power consists of three distinct sine waves each lagging the phase before it by ___________ when viewed on an o-scope commutator - CORRECT ANSWER in a DC generator the slip rings are replaced with a __________ frequency - CORRECT ANSWER AC motor speed depends on the ___________ of the supplied voltage three-phase power - CORRECT ANSWER the most common type of multiphase AC motors use __________ NiCad - CORRECT ANSWER _______ cells are prone to battery memory Lenz 's Law - CORRECT ANSWER A conducting loop in motion through magnetic lines of flux has current induced to it. the physical law that explains this is what? alternator - CORRECT ANSWER An AC generator is also known as a/an _____________ delta, wye - CORRECT ANSWER three phase power is obtained from an AC generator by wiring the armature windings in a _______ or ________ configuration commutator - CORRECT ANSWER what element of a DC generator distinguishes it from an AC generator series wound DC motor - CORRECT ANSWER what type of motor will speed dangerously out of control if not physically loaded. the frequency of the voltage applied to it - CORRECT ANSWER AC motor speed depends on_________________ true - CORRECT ANSWER T/F series wound AC motors have strong torque from a dead stop. This makes them ideally suited for use small appliances. squirrel cage - CORRECT ANSWER what element of a synchronous AC motor provides start up torque for the motor slip - CORRECT ANSWER an AC induction motor requires what to operate? increases - CORRECT ANSWER what happens to the value of a capacitor if the spacing between plates decreases? 1 - CORRECT ANSWER how many time constants does it take to charge a capacitor to 63% of the applied voltage? decreases - CORRECT ANSWER a variable capacitors plates can open or close. aas the plates open, capacitance: less inductance - CORRECT ANSWER an inductor with the same length of wire but whose turns are spaced further apart will have opposes the flow of AC current - CORRECT ANSWER an inductor in an electrical circuit: impedance - CORRECT ANSWER the term for the combination of resistance and reactance that restricts the flow of alternating current is: yes - CORRECT ANSWER is the value of a 500 picofarad capacitor and a .5 nanofarad capacitor identical? true - CORRECT ANSWER in a generator, a DC voltage applied to the field windings control the output level? commutator - CORRECT ANSWER what will cause a generator to produce DC voltage rather than AC? resistors connected in series - CORRECT ANSWER total capacitance of capacitors connected in parallel is like: area of the plates - CORRECT ANSWER which factor determines the value of a capacitor? 47pF - CORRECT ANSWER a 3/8 inch diameter by 3/16 inch ceramic disk capacitor marked "47" is most likely what value? little current flows - CORRECT ANSWER what happens to current flow in a capacitor when the DC voltage across it has increased to the applied voltage? NiMH, Lithium Ion - CORRECT ANSWER Newer __________ and __________ batteries do not have the memory effect and have greater energy-to-weight ratios 5 amps - CORRECT ANSWER a battery rated at 5-AH will deliver the equivalent of ________ for one hour. AC signals, DC current - CORRECT ANSWER Capacitors allow electromagnetic ___________ to pass through but not __________ smaller - CORRECT ANSWER a __________ capacitor will react better to higher frequencies 5 - CORRECT ANSWER A capacitor will charge to 63.2% of full charge in one time constant, in _________ RC times it will be fully charged. emitter , base ,collector - CORRECT ANSWER bipolar transistors are made up of three sections called: positive - CORRECT ANSWER a NPN transistor will have a ______ voltage applied to the collector in a surge suppresor - CORRECT ANSWER A high current MOV device would most likely be found: in a surge suppressor as the radiator in a microwave oven in the DC power supply of a TV asa the oscillator in a superhetrodyne reciever triode - CORRECT ANSWER which of these would most likely be used as a signal generator: triode magnetron triac DAC reduce or short frequencies above certain frequencies - CORRECT ANSWER a capacitor and a resistor in series would be used in a signal line to: microprocessor - CORRECT ANSWER the component used to control the functions of an electronic device most likely would be refered to as .05 microfarad - CORRECT ANSWER a capacitor would most likely be rated: 5 watts 4 henerys 7 ohms .05 microfarad True - CORRECT ANSWER true/false: a negative voltage would be applied to the collector of a PNP transistor a transistor normally has a longer life - CORRECT ANSWER an advantage a transistor has over a vacuum tube triode is: True - CORRECT ANSWER True/false The most likely use of a transformer would be to couple signals from one circuit to the next? balun - CORRECT ANSWER A means of matching an unbalanced antenna or transmission line to a balanced transmission line or antenna (Usually have a transformer in them) Dual inline package - CORRECT ANSWER DIP stands for: against - CORRECT ANSWER current (electrons) flow _______ the arrow in the semiconductor symbol. plus, minus - CORRECT ANSWER Forward bias _______ to P material _________ to N material .7 .3 - CORRECT ANSWER silicon diodes require ______ volts forward bias to overcome the barrier potential and allow conduction to occur. Germanium require _______ volts collector - CORRECT ANSWER on a transistor, the middle initial (NPN, PNP) tells you what voltage to expect on the __________ Common base - CORRECT ANSWER the highest voltage gain bipolar transistor configuration is: N type - CORRECT ANSWER remember, the arrow on a semiconductor device always points to the _________ material, weather it is a diode, transistor or FET High - CORRECT ANSWER FET's are __________ input impedance devices source, gate, drain - CORRECT ANSWER the 3 connections on a FET, JFET and MOSFET are: cathode - CORRECT ANSWER diodes are marked with a band at the ________ end False - CORRECT ANSWER T/F In testing a diode, a forward to reverse ratio of 10-1 is indication of a good diode? Base - CORRECT ANSWER in a transistor, which section is made very thin compared with the other two? emitter - CORRECT ANSWER which part of a transistor carries the most current? DC voltages are reversed - CORRECT ANSWER the primary diffrence between NPN and a PNP transistor is: Common base - CORRECT ANSWER which transistor circuit normally produces the largest voltage gain? remove power - CORRECT ANSWER name one saftey precaution taken before replacing a transistor reverse - CORRECT ANSWER zener and varactor diodes are usually _________ biased solder balls underneath - CORRECT ANSWER a BGA chip has circuit function and how it failed - CORRECT ANSWER troubleshooting a discrete circuit involves a knowledge of surface mount technology - CORRECT ANSWER SMT (regarding chips) stands for use an ESD static grounded soldering pencil or work station - CORRECT ANSWER when replacing a DIP chip: RF equipment - CORRECT ANSWER one area where a technician will still find descrete electronic components is: shunt capacitance - CORRECT ANSWER what basic circuit paramater makes it difficult to build integrated circuits with a high number of components to operate at super high frequencies? 2 - CORRECT ANSWER class _____ electronic products are in the business area and if they fail will cause a loss of time or money 3 - CORRECT ANSWER class _______ electronic products are usually thought of as in the medical or avation field, and if they fail, they could cause a loss of life 1 - CORRECT ANSWER class ________ electronic products are those items that will not cause a loss of time, money and are not used to support life. silicon diode - CORRECT ANSWER The simplest example of a solid state device is a: thyristor - CORRECT ANSWER a four layer PN device is classified as a : in series with the load - CORRECT ANSWER how is a fuse installed in a circuit to insure proper operation? decrease in resistance with temperature - CORRECT ANSWER a negative temperature coefficient thermistor will: 1.2 volts - CORRECT ANSWER a NiMH battery cell when charged, has a terminal voltage of: .3 volts - CORRECT ANSWER germanium diodes have _________ volts forward voltage drop High - CORRECT ANSWER A MOSFET has __________ input impedance 1965 - CORRECT ANSWER When did the CET certification program begin? reduce - CORRECT ANSWER integrated circuit packages ________ space requirements The SCR stays on - CORRECT ANSWER if the gate voltage level, that turns an active SCR on, drops below the trigger point, while anode and cathode voltages are maintained, what will occur? capacitance decreases and the tuned frequency increases - CORRECT ANSWER what is the effect on a varactor (varicap) when the reverse bias voltage is increased? .707 of peak - CORRECT ANSWER RMS (root means square) is calculated by: .636 of peak - CORRECT ANSWER average voltage is calculated by: rectifier, filter, regulator - CORRECT ANSWER in the normal layout (block diagram) of a DC power supply the order of the sections would be: rectifier - CORRECT ANSWER this section of the DC power supply changes AC into pulsating DC transformer - CORRECT ANSWER this section of the DC power supply would step-up or step-down. regulator - CORRECT ANSWER this section of the DC power supply would provide a steady DC voltage to the system. regulator - CORRECT ANSWER the zenner diode is the most important component in what section of a DC power supply: a full wave rectifier - CORRECT ANSWER a ripple frequency of twice the AC frequency is normally associated with a lower ripple voltage - CORRECT ANSWER changing the filter capacitor from 10mF to 50mF in a power supply would result in: rectifier - CORRECT ANSWER the ripple frequency of the output of a full wave rectifier power supply measures the same as the AC input. The section causing the problem is: filter - CORRECT ANSWER Power supply: the ripple voltage is higher than the specifications but the frequency is correct. the section causing the problem is: a higher frequency - CORRECT ANSWER the switching power supply used in a PC takes the input from the AC line and changes it to: Class A - CORRECT ANSWER amplifier: when output current flows for 360 degrees of the input signal, we say the amplifier is ______________ and also linear Class AB - CORRECT ANSWER amplifier: when output current flows for 280 degrees of the input signal, we say the amplifier is ______________ Class B - CORRECT ANSWER amplifier: when output current flows for 200 degrees of the input signal, we say the amplifier is ______________ Class C - CORRECT ANSWER amplifier: when output current flows for less than 180 degrees of the input signal, we say the amplifier is ______________ voltage - CORRECT ANSWER A FET is a _________ controlled device current - CORRECT ANSWER A BJT is a _________ controlled device high, low - CORRECT ANSWER OP amps have a ______ input impedance and a ______ output impedance. direct, capacitor, transformer - CORRECT ANSWER the 3 types of cascading amplifier circuit coupling are: 280 degrees - CORRECT ANSWER A class AB amplifier will allow output current to flow for approximately ________ of the input signal. class B or AB - CORRECT ANSWER which of the following amplifier configuration(s) would you likely find being used in a linear push-pull arrangement? selectivity - CORRECT ANSWER which of the following terms is associated with a commercial receiver being able to reject image frequencies phase locked loop (PLL) - CORRECT ANSWER what circuit can be used to recover audio from an IF in a FM receiver? decreases - CORRECT ANSWER if the frequency of the broadband input signal to an Op-amp increases, then the output signal level __________. False - CORRECT ANSWER T/F when measuring power to a speaker, a doubling of the power represents a 6db increase. True - CORRECT ANSWER T/F An audio radiation resistance circuit is NOT part of a superheterodyne radio receiver? detector circuit - CORRECT ANSWER which part of a superheterodyne receiver rectifies the RF carrier? 1.6 feet 246/Frequency - CORRECT ANSWER how long should a 1/4 wavelength vertical antenna be that is designed for operation on 146MHz? D layer - CORRECT ANSWER Which layer of the ionosphere absorbs high frequency radio waves during daylight hours? modulation - CORRECT ANSWER ____________ is the process of imposing intelligence on a carrier signal. modulate, shift - CORRECT ANSWER AM transmitters ________ the RF carrier wave with the intelligence to be transmitted. FM transmitters ________ the frequency of the carrier wave to represent intelligence. 6MHz - CORRECT ANSWER the width of a single channel of TV video and audio is: Klystron, magnetron - CORRECT ANSWER two electron tubes used to produce microwaves are______, _____. klystrons - CORRECT ANSWER _________ are used in low to medium power microwave applications. magnatron - CORRECT ANSWER a _________ tube produces a microwave signal for use in high power applications. multiplies the average value by 1.111 before displaying the voltage - CORRECT ANSWER an average reading AC voltmeter _________ kilowatts - CORRECT ANSWER the power rating for a satellite up-link transmitter is measured in ______. modulation - CORRECT ANSWER what is the process of imposing intelligence on a carrier wave? below GHz - CORRECT ANSWER flexible coaxial transmission lines are ideal for what frequencies? impedance mismatch - CORRECT ANSWER standing waves occur on a transmission line when there is a/an ________ between the transmission line and load True - CORRECT ANSWER T/F maximum power transfer to the load occurs when the load impedance matches that of the transmission line. maximum - CORRECT ANSWER antenna resonance is the characteristic that permits __________ radiation of the transmitted signal. line of sight UHF - CORRECT ANSWER space waves are ideal for what frequency of communications? electric lines of force - CORRECT ANSWER electromagnetic field polarization is determined by orientation of what part of the electromagnetic wave? true - CORRECT ANSWER T/F the orientation of the transmitter antenna and the receiver must match for ideal reception L= v/f - CORRECT ANSWER the basic formula for wavelength is: L= wavelength v=velocity f=frequency how is it calculated? grounded - CORRECT ANSWER quarter wave antennas must be __________ at one end for resonance at the desired frequency. 30-70% - CORRECT ANSWER CMOS is undefined between _______ of Vcc line - CORRECT ANSWER TEL a connection from a local central office to customer premise equipment:_______ trunk - CORRECT ANSWER TEL a connection between central office switching centers, toll carriers, regional tandem offices or long distance carriers that carries one conversation in both directions:________ Central office - CORRECT ANSWER TEL a point of connection for all local subscribers to connect to the network for service:________ inter-lata - CORRECT ANSWER TEL telephone service connections between different area codes:______ intra-lata - CORRECT ANSWER TEL telephone service connections between the same area codes. Sometimes called long distance. LATA - CORRECT ANSWER TEL local area transport authority. boundaries between area codes are called lata-lines:________________ signaling - CORRECT ANSWER TEL the transport of special commands needed by the telephone network to perform operations such as call setup, call delivery, call tear down:_________ SS7 - CORRECT ANSWER TEL the common channel signaling specification known as signaling system 7:_______ 350+440Hz - CORRECT ANSWER dial tone frequency: 440+620Hz - CORRECT ANSWER busy frequency 440+480Hz - CORRECT ANSWER ringback frequency polarity - CORRECT ANSWER when connecting an analog voltmeter into a DC circuit, what should be observed? frequency division multiple - CORRECT ANSWER FDM? 24 - CORRECT ANSWER number of voice channels in a T1 (DS-1) ? 28 - CORRECT ANSWER number of DS-1 in a DS-3 3 - CORRECT ANSWER number of DS-3 in an OC-3? -48v - CORRECT ANSWER on hook DC voltage on a telephone local loop? 350 + 440 Hz - CORRECT ANSWER dial tone is composed of these two frequencies? two central offices - CORRECT ANSWER a trunk connects: CCS (common channel signaling) - CORRECT ANSWER the form of signaling used on telephone systems today: 1.544 Mbps - CORRECT ANSWER the maximum bit rate available on a T-1 transmission system is: inter-LATA - CORRECT ANSWER a call between area codes is: hybrid coil - CORRECT ANSWER the device that causes the phase change between mouth and ear audio in a telephone subscriber unit is the: Code Division Multiple Access - CORRECT ANSWER CDMA CDMA - CORRECT ANSWER the 2nd generation digital wireless access technology that uses code patterns to separate users is: piezoelectric effect - CORRECT ANSWER oscillators use quartz crystals that generate output by the: -48 VDC - CORRECT ANSWER analog telephone lines have what DC voltage level across the tip and ring when off hook? free space velocity - CORRECT ANSWER the velocity factor in a transmission line is compared to: False - CORRECT ANSWER T/F cables of different impedances may be combined for short runs? 6 MHz - CORRECT ANSWER the bandwidth of a standard definition analog TV signal is: RF - CORRECT ANSWER what radio receiver section determines the radios inherent noise level? resistors - CORRECT ANSWER carbon microphones are much like variable: large waveguide dimensions required at lower frequencies are not practical - CORRECT ANSWER waveguides are not utilized at HF or VHF frequencies because: 10-40% - CORRECT ANSWER TTL is undefined between________ of Vcc monostable - CORRECT ANSWER ________ generates a single pulse ( sometimes referred to as a one-shot) bistable - CORRECT ANSWER ________ gives a "clean" high or low (sometimes referred to as a latch) astable - CORRECT ANSWER _________ produces a series of square pulses (sometimes referred to as free running or clock) BIT - CORRECT ANSWER one binary digit is referred to as a _______ NIBBLE Bit: 1 digit Nibble: 4 digits Byte: 8 digits Word: (e.g. 16-bit, 32-bit, 64-bit words). - CORRECT ANSWER a 4 bit combination is called a ________ BYTE - CORRECT ANSWER an 8 bit combination is called a ________ WORD - CORRECT ANSWER a combination of more than 8-bits are called _______ more than 2 volts - CORRECT ANSWER a logic 1 for a TTL device is: more than 3.5 volts - CORRECT ANSWER a logic 1 for a CMOS device connected to a 5V supply is: a logic low - CORRECT ANSWER Digital a green light usually indicates: free running - CORRECT ANSWER another name for an astable multivibrator is: 1100 - CORRECT ANSWER the number 12 in decimal is ________ in binary 010 101 - CORRECT ANSWER the number 25 in octal is _______ in binary AND,OR,NOT - CORRECT ANSWER the 3 basic logic gates are universal - CORRECT ANSWER the NAND gate is sometimes called: ALU (arithmetic logic unit) - CORRECT ANSWER what portion of the microprocessor would perform the addition of two numbers? machine language - CORRECT ANSWER what language can run directly on the microprocessor? Bus - CORRECT ANSWER which component of the microprocessor connects all of the sub systems together derivitave - CORRECT ANSWER microprocessors: what type of control handles the rate of change of the error? integral - CORRECT ANSWER microprocessors: what type of control handles long term errors? ON/OFF - CORRECT ANSWER microprocessors: what type of control has the controlled element in either the full open or full closed position? interpreted language - CORRECT ANSWER which type of microprocessor program runs the slowest? excessive cycling at the set point - CORRECT ANSWER what problem does adding hysteresis to an ON/OFF control system fix? register - CORRECT ANSWER where are the results of a math operations stored in a microprocessor? 1 or High - CORRECT ANSWER the +5V level of a TTL digital signal is called a logical: - CORRECT ANSWER 165 decimal converted to binary would be: 64 - CORRECT ANSWER the 1 in binary number 1000000 carries a decimal weight of: MOS - CORRECT ANSWER which integrated circuit or semiconductor devices normally require the most careful handling to avoid damage by static electricity? a low current digital display - CORRECT ANSWER An LCD (liquid crystal display) is: 62 - CORRECT ANSWER Hexidecimal 3E is equivalent to a decimal number of: 1001 - CORRECT ANSWER what is the binary number for decimal number 9? digital signal generator - CORRECT ANSWER logic pulser can be used as a: the operator - CORRECT ANSWER Diagnostics: who knows the most about a piece of equipment? verify the failure - CORRECT ANSWER Diagnostics: before beginning to troubleshoot, what should you do? heat - CORRECT ANSWER Diagnostics: a short allows for an increase in current and _________ five senses - CORRECT ANSWER Diagnostics: what is the oldest piece of troubleshooting equipment a technician has? interconnect diagram - CORRECT ANSWER Diagnostics: what is the name of the diagram that shows all the general cable connections of a piece of equipment? reduces circuit loading, increases the effective input impedance and decreases the signal to the scope - CORRECT ANSWER the use of a x10 oscilloscope probe instead of a direct probe does: (3 answers) time division multiplex - CORRECT ANSWER TDM? applied to the Z-axis - CORRECT ANSWER retrace blanking in an oscilloscope is __________ low ohms function - CORRECT ANSWER to accurately measure a resistance across a transistor's emitter-base junction, use a ____________. ringer test - CORRECT ANSWER an inductor shorted turn can be detected reliably using a ________. it is a true RMS meter - CORRECT ANSWER An AC voltmeter will measure a non-sine wave signal accurately only if_______________ provides a floating secondary reference point - CORRECT ANSWER a type of transformer which has a 1:1 turns ratio _________. a full wave bridge rectifier connected directly to the AC power source - CORRECT ANSWER shock hazard exist especially in a power supply which has _______ limits the meter movement current to it's full scale value - CORRECT ANSWER A DC voltmeter multiplier resistor ____________ 250k Ohms (50/.0002) - CORRECT ANSWER a simple DC voltmeter with a 200ua meter movement needs to have how much internal resistance on it's 50 Volt range? 361-376 degrees - CORRECT ANSWER 60/40 solder (60% tin 40% lead) melts between _________ degrees two sine waves that are 90 degrees out of phase fed to the vertical and horizontal inputs - CORRECT ANSWER a circle is obtained on a oscilloscope screen when: 1KHz - CORRECT ANSWER which frequency is most commonly used for audio troubleshooting? block DC level present - CORRECT ANSWER why is a coupling capacitor used when troubleshooting with signal injection? bad shielded cable from the CD player - CORRECT ANSWER which would likely be the cause of a hum in an amplifier, but only present when the CD player is selected? power supply filtering - CORRECT ANSWER a stereo amplifier has a severe hum whether CD, AUX, FM or AM radio are selected. what is the most likely cause? verticle - CORRECT ANSWER the Y axis of an oscilloscope is: decreases circuit loading that a direct probe presents - CORRECT ANSWER a x10 probe has what effect on circuit testing? pulses - CORRECT ANSWER a voltmeter that converts AC to DC by rectifying the voltage, would be least accurate at measuring what types of alternating voltage? 1/4 wavelength (in feet)= 246/frequency(mhz) - CORRECT ANSWER The formula for finding a 1/4 wave antenna length?