CET Exam Questions with Complete Answers, 2022/2023. RATED A

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CET Exam Questions with Complete Answers 1. When did the CET certification program begin? A. 1965 B. 1976 C. 1986 D. 1996 -Answer- A. 1965 2. When did ETA initiate Renewal? A. 1966 B. 1976 C. ... 1986 D. 1996 -Answer- D. 1996 3. All ETA Certification categories require the passage of the Associate CET Examination. A. True B. False -Answer- B. False 4. To qualify for MASTER CET, the examinee must attain a score of 85% on each separate exam. A. True B. False -Answer- B. False 5. An Associate CET cannot attempt one of the specialty examinations. A. True B. False -Answer- B. False 6. Master CET status is lifetime and does not require re-certification. A. True B. False -Answer- A. True 7. The Journeyman level: A. denotes competency in one specialized area. B. requires 75% passing. C. requires 2 yrs of work or school. D. all of the above. -Answer- D. all of the above. 8. Renewal requires payment of a fee and retesting or proving at least 40 hours of upgrade retraining within a four-year period. A. True B. False -Answer- A. True 9. A worker may become certified by ETA as a CST (Computer Service Technician), without also becoming certified as a CET (Certified Electronics Technician). A. TrueB. False -Answer- A. True 10. The Associate CET exam may be taken after the Journeyman exam. A. True B. False -Answer- B. False 1. B+, or supply voltages in electronics products, are considered to be: A. +5 to +12 V DC. B. 0 to 30 V DC. C. +12 to 300 V DC. D. the anode or plate voltage supply. -Answer- C. +12 to 300 V DC. 2. Leakage current in an electronic product, between either of the AC power cord conductors and the chassis or any exposed metal parts should not exceed _____. A. 5 microamps B. 500 microamps C. 5 milliamps D. 50 milliamps -Answer- B. 500 microamps 3. Shaded components on electronics schematics mean: A. only factory service personnel may change the part. B. only exact replacement parts may be used. C. the shading makes for better readability. D. high voltage is present on these parts. -Answer- B. only exact replacement parts may be used. 4. Ingested solder fumes or particles _______. A. are not harmful to the human body B. are toxic C. from lead-tin solder aren't harmful D. from tin-alloys are most harmful -Answer- B. are toxic 5. Second degree skin burns should_____. A. not be treated with ice and bandage pack B. be covered with thick bandages C. be treated with cold water or ice D. be treated by draining blisters -Answer- A. not be treated with ice and bandage pack 6. Rules describing the fire or toxicity retardant types of cabling which may be installed in buildings is contained in _____. A. NEC Article 770 B. UL 568B C. TIA/EIA standard 578 D. NEMA code 1316 -Answer- A. NEC Article 770 7. ESD and static discharge is most destructive to_____.A. CMOS semiconductors B. TTL semiconductors C. Germanium PN junctions D. Silicon PN junctions -Answer- A. CMOS semiconductors 8. If you have never received formal training and practiced CPR on a person or dummy, in the event of finding a fellow worker not breathing, you _____. A. should use what knowledge you do have of the procedure and attempt it B. should not attempt it, but call for help C. should attempt it after calling for help D. should, if handy, read the instructions and attempt it in order to save the life -AnswerB. should not attempt it, but call for help 9. When working at heights above 6 feet, a _____ is required by OSHA rules. A. lineman's belt B. lineman's belt attached to a lanyard C. full body harness attached to a lanyard which prevents more than a 6' drop D. good insurance policy -Answer- C. full body harness attached to a lanyard which prevents more than a 6' drop 10. Residual voltage is associated with_____. A. Northern Lights B. corona arcing from electrical generators C. charge retained by inductors D. charge retained by capacitors -Answer- D. charge retained by capacitors 1. In a direct current (DC) circuit the relationship between voltage, resistance, and current is called Ohm's Law. A. True B. False -Answer- A. True 1. The atomic number of an element is the same as the element's atomic weight. A. True B. False -Answer- B. False 2. An increase in voltage with resistance held constant causes current to ____________. A. decrease B. increase twice to value of voltage C. increase D. none of the above -Answer- C. increase The ampere, expresses _____. A. volts /sec increase B. a unit of charge movement per second past a given point C. coulombs/chargeD. an increase in resistance -Answer- a unit of charge movement per second past a given point The total resistance of a parallel circuit containing equal branch resistances is found by the following: A. by adding all of the branch resistance values. B. by taking the product of all the branch resistance values. C. by dividing the resistance value of a branch by the number of branches. D. the value cannot be found. -Answer- C. by dividing the resistance value of a branch by the number of branches. An open is found in the series connected load of the transistor amplifier circuit as shown. If a voltmeter were connected from the open side of the resistor (top point of open as shown) to ground, what will be the reading? View Figure ch4 Q5.jpg A. 0 volts B. -12 vdc C. Half of +Vcc D. None of the above -Answer- B. -12 vdc What is the voltage drop across the 2000 ohm resistor as shown in the amplifier? View Figure ch4 Q5.jpg A. 7.5 vdc B. 8.0 vdc C. 9.0 vdc D. none of the above -Answer- B. 8.0 vdc If there is NO open in the circuit, what is the voltage across the 3000 ohm emitter resistor as shown? View Figure ch4 Q5.jpg A. 5.1 vdc B. 6.0 vdc C. 8.0 vdc D. None of the above -Answer- D. None of the above A 12 vdc power supply has a 15 ohm internal resistance. What load resistance can be connected to transfer maximum power? A. 15 ohms B. 20 ohms C. 10 ohms D. 5 ohms -Answer- A. 15 ohms Maximum power transfer occurs when the load impedance is equal to the source impedance. A. True B. False -Answer- A. TrueWhat is the current through the resistor in the shown schematic? View Figure ch4 RQ1.jp A. .2 amps B. 2 amps C. 5 amps D. 50 amps -Answer- B. 2 amps In the circuit shown, what is the power dissipated in the resistor? View Figure ch4 RQ1.jp A. 6 watts B. 12 watts C. 2 watts D. 24 watts -Answer- D. 24 watts What will happen to the current through a resistor if the resistor value increases? A. Current increases B. Current remains unchanged C. Current decreases D. Current and the voltage across the resistor increases -Answer- C. Current decreases Which type of circuit has the same voltage drop across each component? A. Parallel B. Series-parallel C. Series D. Combination -Answer- A. Parallel Total power in a series circuit is determined by the: A. source voltage times the current. B. total voltage applied to the circuit. C. current flowing through the switch. D. average wattage rating of each resistor. -Answer- A. source voltage times the current. Which is the equivalent to 100 microamps? A. .1 milliamps B. 1 milliamps C. 10 milliamps D. 10 nanoamps -Answer- A. .1 milliamps If the current drain from the battery is 4 mA, what resistance is the rheostat in the drawing? View Figure ch4 RQ7.jp A. 1.0 kohms B. 2.5 kohm C. 5.0 kohm D. 10 kohm -Answer- B. 2.5 kohmIn the circuit shown how much current is flowing in R2? View Figure ch4 RQ8.jp A. 1 amp B. 2 amps C. 10 amps D. 100 amps -Answer- A. 1 amp A resistor_______________________. A. stores an electric charge B. is measured in coulombs C. in a circuit causes a voltage drop from one end to the other D. is dependent on lines of force -Answer- C. in a circuit causes a voltage drop from one end to the other 1 kΩ is the same as___________________. A. 1 thousand ohms B. 1 thousandth of an ohm C. 10-2 ohms D. 10000 ohms -Answer- A. 1 thousand ohms A resistor has color bands orange, red, brown. It is __________________. A. 232 ohms B. 3.2 megohms C. 2.3 kohms D. 320 ohms -Answer- D. 320 ohms 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 __________. A. 666 ohms B. 167.7 ohms C. 750 ohms D. 1000 ohms -Answer- D. 1000 ohms The voltage rating of a capacitor______________. A. must be factored into the reactance formula B. relates to the maximum voltage that should be applied to it C. indicates the maximum current the capacitor can allow D. is the same as the power factor -Answer- B. relates to the maximum voltage that should be applied to it Calculating the total capacitance of several capacitors connected in parallel ______________. A. is not necessary as they are not used this way B. causes a need to consider inductance factors C. is done by adding each of the capacitance values D. is the same as the power factor -Answer- C. is done by adding each of the capacitance valuesFerrite _____________________________. A. is a capacitor dielectric B. is a common inductor core material C. is the most common resistor coating D. causes faulty saturation of inductors -Answer- B. is a common inductor core material The term Henry refers to______________. A. the inductive property of a coil B. the inventor of inductors C. reactance of LR circuits D. resonant frequency of tank circuits -Answer- A. the inductive property of a coil A certain transformer has 250 turns in the primary winding and 1250 turns in the secondary winding. The turns ratio is ___________. A. 0.2 B. 2.5 C. 5 D. 0.5 -Answer- A. 0.2 When the turns ratio of a transformer is 10 and the primary AC voltage is 8V, the secondary voltage is ______________. A. 80 Volts B. 0.8 Volts C. 8 Volts D. 64 Volts -Answer- B. 0.8 Volts Which of these color code patterns is found on a 270Ω 5% resistance? A. Red, violet, brown, silver B. Red, violet, brown, gold C. Red, violet, black, silver D. Red, brown, black, silver -Answer- B. Red, violet, brown, gold One microfarad is equivalent to __________ picofarads. A. 10 B. 1000 C. 100,000 D. 1,000,000 -Answer- D. 1,000,000 The capacitance of a capacitor with 10μC of electric charge and 100V across its plates is ____________. A. 0.1μF B. 10μF C. 1000μF D. 107μF -Answer- A. 0.1μFTotal impedance in a series circuit is found by: A. adding up all the series resistance and reactance values. B. subtracting all the inductive reactances from all the capacitive reactance's and adding the resistors' values. C. finding the net reactance and the net resistance, square each separately, add them together and then find the square root of the sum. D. divide the applied voltage by the addition of all the circuit components individual currents. -Answer- C. finding the net reactance and the net resistance, square each separately, add them together and then find the square root of the sum. In a series AC circuit with a resistor, inductor and capacitor, each with the same resistance or reactance, a voltmeter measuring each individual voltage drop would find: A. the voltages equal to each other. B. the reactance voltage of the capacitor or the inductor would be greater than the resistance voltage measurement. C. the resistance voltage would be higher than the voltage across the inductor or the capacitor. D. the supply voltage would be measured across the resistor and the voltage across the capacitor and across the inductor would measure 0V. -Answer- A. the voltages equal to each other. Which of the following is not a characteristic of a series circuit? A. Circuit components have a division of the supply voltage. B. All components share one current. C. Energy is shared by reactive devices. D. There is a different level of current in the reactive components than in the resistive components. -Answer- D. There is a different level of current in the reactive components than in the resistive components. In an AC circuit, as the applied voltage frequency changes upward, the inductive reactance in the circuit will: A. decrease. B. increase. C. stay the same. D. either increase or decrease. -Answer- B. increase. In an AC circuit, as the applied voltage frequency increases the capacitive reactance in the circuit will: A. decrease. B. increase. C. stay the same. D. either increase or decrease. -Answer- A. decrease. A 50KHz AC voltage is applied to a 10mH inductor, its reactance at this frequency is: A. 3140 Ohms. B. 300 Ohms.C. 3100 Ohms. D. 500 Ohms. -Answer- A. 3140 Ohms. A .1 uF capacitor in a circuit with a frequency of 100 KHz applied has a reactance of: A. 1.59 Ohms. B. 15.9 Ohms. C. 159 Ohms. D. 15.9 kOhms. -Answer- B. 15.9 Ohms. In a series circuit when the inductive reactances equal the capacitor reactances the circuit has __________ impedance. A. maximum B. double the inductor's C. minimum D. no -Answer- C. minimum In a parallel circuit when the inductive reactances equal the capacitor reactances the circuit has ___________ impedance. A. maximum B. double the capacitor's C. minimum D. no -Answer- A. maximum Resonance is when ___________. A. all resistances in an AC circuit are equal to each other B. all reactances are equal on each reactive component C. the total of the inductive reactances in the circuit equal the total of all capacitive reactances D. no current is flowing through an AC circuit when a voltage is applied -Answer- C. the total of the inductive reactances in the circuit equal the total of all capacitive reactances _____ cells are prone to battery memory. A. Zinc B. NiCad C. Alkaline D. Lithium -Answer- B. NiCad A conducting loop in motion through magnetic lines of flux has a current induced in it. The physical law that explains this is what? A. Lenz's Law B. The law of inertia C. The Compton shift equation D. Kirchoff's current law -Answer- A. Lenz's Law An AC generator is also known as a _________ . A. regulatorB. alternator C. phasor D. slip ring -Answer- B. alternator Three-phase power is obtained from an AC generator by wiring the armature windings in a _____ or _____ configuration. A. alpha, beta B. treble, tri-phase C. polymorph, one-to-three D. delta, wye -Answer- D. delta, wye What element of a DC generator distinguishes it from an AC generator? A. Slip rings B. Commutator C. Series wound field coil D. Armature -Answer- D. Armature What type of motor will speed dangerously out of control if not physically loaded? A. Induction motor B. Shunt wound DC motor C. Series wound DC motor D. Series wound AC motor -Answer- C. Series wound DC motor AC motor speed depends on _________. A. the frequency of the voltage applied to it B. the voltage level applied to it C. the phase of the voltage applied to it D. the power left in the dilithium crystals -Answer- A. the frequency of the voltage applied to it Series wound AC motors have strong torque from a dead stop. This makes then ideally suited for use in small appliances. A. True B. False -Answer- A. True What element of a synchronous AC motor provides startup torque for the motor? A. Slip rings B. Salient poles C. Squirrel cage D. Armature -Answer- A. Slip rings An AC induction motor requires what to operate? A. Input power B. Slip rings C. Slip D. Rotor battery -Answer- C. SlipWhat happens to the value of a capacitor if the spacing between plates decreases? A. Increases B. Remains the same C. Decreases D. Varies -Answer- A. Increases Which waveform shown is a sine wave? View Figure ch7 RQ2.jp A. D B. C C. B D. A -Answer- D. A The peak to peak voltage of the shown waveform is: View Figure ch7 RQ3.jp A. 7 V. B. 14 V. C. 4.95 V. D. .707 V. -Answer- B. 14 V. The circuit shown will require how many RC time constants to charge the capacitor to 63% of the applied voltage? View Figure ch7 RQ4.jp A. 1 B. 2 C. 63 D. 100 -Answer- A. 1 A variable capacitor's plates can open or close. As the plates open, capacitance: A. remains the same. B. capacitors aren't made this way. C. decreases. D. increases. -Answer- C. decreases. An inductor with the same length of wire but whose turns are spaced further apart will have: A. less inductance. B. more inductance. C. equal inductance. D. more mutual inductance. -Answer- A. less inductance. What frequency will the parallel LC circuit shown be resonant to? View Figure ch7 RQ7.jp A. 100 MHz B. 159 Hz C. 6.28 MHz D. 1590 KHz -Answer- B. 159 HzWhich formula is used to calculate reactance in the following schematic? View Figure ch7 RQ8.jp A. Xc = 1 / 2 π FC B. Xc = 2 π FC C. Xc = R2 + L2 + C2 D. Xc = 2 π LFC -Answer- A. Xc = 1 / 2 π FC An inductor in an electrical circuit: A. causes current to lead voltage. B. opposes the flow of AC current. C. appears capacitive to AC current. D. appears as a short circuit to AC current. -Answer- B. opposes the flow of AC current. The term for the combination of resistance and reactance that restricts the flow of alternating current is: A. volt-amperes. B. impedance. C. susceptance. D. power factor. -Answer- B. impedance. Is the value of a 500 picofarad capacitor and a .5 nanofarad capacitor identical? A. Yes B. No -Answer- A. Yes In a generator, a DC voltage applied to the field windings controls the output level. A. True B. False -Answer- A. True Which one of the below might be used in DC motor electronic speed controls? A. Delta coil B. Magnetic brush C. Slip rings D. Comparator op-amp -Answer- D. Comparator op-amp Which one of the below is a common description of the filter shown? View Figure ch7 RQ14.j A. Bandpass B. Low pass L C. Low pass T D. High pass T -Answer- C. Low pass T What is the combined reactance of the two capacitors in series in the drawing shown? View Figure ch7 RQ15.j A. Approximately 1,198 ohms B. Approximately 265 ohms C. Approximately 24 ohmsD. Approximately .00377 ohms -Answer- A. Approximately 1,198 ohms Which one of the below will cause a generator to produce DC voltage rather than AC voltage? A. Brushes B. Armature C. Commutator D. Field windings -Answer- C. Commutator Total capacitance of capacitors connected in parallel is like: A. resistors connected in series. B. capacitors connected in series. C. resistors connected in parallel. D. inductors connected in parallel. -Answer- A. resistors connected in series. Which factor determines the value of a capacitor? A. Area of the plates B. Temperature coefficient of the dielectric C. Inductance of the dielectric D. Insulation covering -Answer- A. Area of the plates A 3/8-inch diameter by 3/16-inch ceramic disk capacitor marked "47" is most likely what value? A. 47 nf B. 47 uf C. 47 pf D. 47 mf -Answer- C. 47 pf What happens to current flow in a capacitor when the DC voltage across it has increased to the applied voltage? A. Current flow is maximum in capacitor. B. Little current flows. C. Polarity reverses. D. Voltage drop is maximum. -Answer- B. Little current flows. Decreasing the inductance in a series tuned circuit will cause the resonant frequency to: View Figure ch7 RQ21.j A. increase. B. decrease. C. there will be no change. D. become unstable. -Answer- A. increase. The filter configuration shown is commonly called: View Figure ch7 RQ22.j A. an "L" filter. B. a "PI" filter. C. an LCL filter.D. a CLC filter. -Answer- B. a "PI" filter. The sine wave shown is at what frequency? View Figure ch7 RQ23.j A. 500 KHz B. 50 KHz C. 5 KHz D. 500 Hz -Answer- D. 500 Hz Which of these is within tolerance for a resistor color coded red, black, red, gold. A. 1850 ohms B. 2150 ohms C. 1950 ohms D. 2250 ohms -Answer- C. 1950 ohms A high current MOV device would most likely be found: A. in a surge suppressor. B. as the radiator in a microwave oven. C. in the DC power supply of a television. D. as the oscillator in a superheterodyne receiver. -Answer- A. in a surge suppressor. Which of these would most likely be used as a signal amplifier? A. Triode B. Magnetron C. Triac D. DAC -Answer- A. Triode A capacitor and a resistor in series would be used to: A. cut off the peaks in AC signals at a set level. B. reduce or short signals above certain frequencies. C. pass the DC level, while blocking the AC signal. D. filter inductances from getting into an amplifier. -Answer- B. reduce or short signals above certain frequencies. The component used to control the functions of an electronic device most likely would be referred to as: A. RAM. B. SCR. C. Microprocessor. D. Op-amp. -Answer- C. Microprocessor. A capacitor would most likely be rated: A. 5 watts. B. 4 henrys. C. 7 ohms. D. .05 microfarad. -Answer- D. .05 microfarad.Which of these is most true of a PNP transistor? A. It will avalanche when the cutoff is reached. B. It conducts equally well forward or backward. C. A negative voltage will be applied to the collector. D. The cathode must be heated to operate. -Answer- C. A negative voltage will be applied to the collector. An advantage a transistor has over a vacuum tube triode is: A. a triode cannot conduct from the cathode to the anode. B. a transistor does not require an anode load. C. a triode requires grid bias. D. a transistor normally has a longer life. -Answer- D. a transistor normally has a longer life. The most likely use of a transformer would be: A. to couple signals from one circuit to another. B. to filter out unwanted signals. C. as a regulator in power supplies. D. to protect a circuit from excessive currents. -Answer- A. to couple signals from one circuit to another. Which of these would apply mostly to a "balun"? A. Semiconductor B. Impedance matching device C. Integrated circuit D. Over voltage protection -Answer- B. Impedance matching device DIP refers to: A. double integrated protection. B. dual ion positron. C. discrete icon positioner. D. dual inline package. -Answer- D. dual inline package. Diodes are marked with a band at the ______ end. A. cathode B. anode C. center D. base element -Answer- A. cathode In testing a diode, a forward-to-reverse ratio of 10-1 is indicative of a good diode. A. True B. False -Answer- B. False To properly bias a NPN silicon signal amplifier transistor, which voltages appear correct for a signal amplifier (SI)? A. E = 0; B = +.5; C = 10 [Show More]

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