The Associate CET Study Guide Exam With Complete Solution

B+, or supply voltages in electronics products, is considered to be: A. +5 to +12 VDC B. 0 to 30 V DC C. +12 to 300 V DC D. The anode or plate voltage supply - Answer D. The anode or plate voltage supply Leakage current in an electronic product, between either of the AC power cord conductors and the chassis or any exposed metals should not exceed _________. A. 5 microamps B. 500 microamps C. 5 milliamps D. 50 milliamps - Answer B. 500 microamps Shaded components on the 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 Ingested solder fumes when particles _______. A. I'm 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 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 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 569B C. TIA/EIA standard 578 D. NEMA code 1316 - Answer A. NEC Article 770 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 If you have never receive formal training and practice CPR want a pricing or dummy, in the event of finding a fellow worker not breathing, you _________. A. Should use what knowledge you do half 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 in order to save the life - Answer B. Should not attempt it, but call for help When working at heights above 6 feet, a ________ is required by OSHA rules. A. Linesman's belt B. Linesman's belt attached to a lanyard C. Full body harness attached to a lanyard that prevents more than a 6 foot drop D. Good insurance policy - Answer C. Full body harness attached to a lanyard that prevents more than a 6 foot drop 'Phantom' current 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 The atomic number of an element is the same as the element's atomic weight. A. True B. False - Answer B. False An increase in the 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/charge D. An increase in resistance - Answer B. 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 A 12 V DC power supply has a 15 ohm internal resistance. What load resistance can you 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 low impedance is equal to the source impedance. A. True B. False - Answer A. True What will happen to the current through the resistor if the resistor value increases? A. Current increases B. Current remains unchanged C. Current decreases D. Car and the voltage across the resistor increases - Answer C. Current decreases Which type of circuit has the same voltage 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 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 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 A. 666 ohms The voltage rating of a capacitor ___________. A. Must be factored into the resistance 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 values Ferrite __________. A. Is a capacitor dielectric B. Is a common inductor core material C. Is the most common resistor coating D. Causes faulty saturation of the 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 the tank circuits - Answer A. The inductive property of a coil A certain transformer has 250 turns in the primary windings and 1250 turns in the secondary winding. The turns ratio is __________. A. 0.2 B. 2.5 C. 5 D. 0.5 - Answer C. 5 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 A. 80 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. 0.1μF Total impedance in a series circuit is found by: A. Adding up all the series existence in reactance values B. Subtracting all the inductive reactance 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 of reactance, a voltmeter measuring each individual voltage drop would find: A. The voltage 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 voltage equal to each other Which if the following is not 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 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 .1μF capacitor in a circuit with 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 inductor'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. Kirchhoff' current law - Answer A. Lenz's Law An AC generator is also known as a __________. A. Regulator B. Alternator C. Phaser 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 a AC generator? A. Slip rings B. Commutator C. Series wound field coil D. Armature - Answer B. Commutator What type of motor will speed dangerously out of control if not physically load it? 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 C. The phase of the voltage applied to it D. The power left in the dilithium - 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 C. Squirrel cage An AC inductive motor requires what to operate? A. Input power B. Slip rings C. Slip D. Rotor battery - Answer C. Slip What 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 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 mural inductance - Answer A. Less inductance 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 below will cause a generator to produce DC voltage rather AC voltage? A. Brushes B. Armature C. Commutator D. Field windings - Answer C. Commutator Total capacitance of capacitors 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 determine 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 nf - 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