Electronics ETA Certification Practice Exam 74 Questions with Verified Answers,100% CORRECT

Electronics ETA Certification Practice Exam 74 Questions with Verified Answers The "triboelectric effect" causes what kind of electricity? - CORRECT ANSWER Static The law of static electrical charges states: - CORRECT ANSWER like charges repel Minute particles that make up all possible elements and still retain the unique chemical characteristics of the element are called _____________. - CORRECT ANSWER Atoms A molecule is the smallest particle of matter that can exist by itself. (1) - CORRECT ANSWER True (1) A basic atom must contain what two types of subatomic particles? - CORRECT ANSWER Electron and proton An electron has _______________. - CORRECT ANSWER a Negative charge What two types of energy are used throughout electronics? - CORRECT ANSWER Kinetic and potential Electrical direct current flowing in a wire produces a magnetic field: - CORRECT ANSWER at right angles to current flow A material is magnetized when the: - CORRECT ANSWER domains are in alignment A material that can be magnetized easily falls into this category: - CORRECT ANSWER Ferromagnetic Invisible lines of force that surround a magnet are called ___________________. - CORRECT ANSWER magnetic flux lines The pole of a magnet from which flux leaves is called the __________________. - CORRECT ANSWER north _________________ force produces magnetic flux. - CORRECT ANSWER Magnetomotive What class of fire extinguisher is used on an oil fire? - CORRECT ANSWER B It is dangerous to use wooden handled tools around high voltage due to their ability to absorb moisture. (2) - CORRECT ANSWER True (2) In order to eliminate possible fire hazards, rags should be stored in ________________ - CORRECT ANSWER metal containers When an individual receives an electrical shock, an immediate symptom can be _______________. - CORRECT ANSWER Cardiac arrest What happens as protective eye goggles age? - CORRECT ANSWER Their resistance to scratching decreases Safety precautions to be followed when working on high-voltage equipment include which of the following? - CORRECT ANSWER All jewelry should be removed The main purpose of a safety observer is to: - CORRECT ANSWER turn off equipment in use and apply emergency first aid or cardiopulmonary resuscitation if needed You should use caution when talking to someone who is operating electrical equipment because the distraction: - CORRECT ANSWER • could damage the equipment • both could be injured • could ruin an electronic device Which device would most likely include a light level meter? - CORRECT ANSWER Camera The most common functions of a generic multimeter are _________________________. - CORRECT ANSWER voltmeter, ammeter and ohmmeter Digital multimeters eliminate which of the following disadvantages of analog meters? - CORRECT ANSWER • Low impedance • Poor accuracy • Parallax errors The Wheatstone bridge can be used for precision measurements of: - CORRECT ANSWER resistance The ammeter setting on a multimeter indicates what type of reading? - CORRECT ANSWER current A resistor with color bands of blue, gray and black has a value of _______________. - CORRECT ANSWER 68 ohms 20% A/an _____________ allows current to flow easily. - CORRECT ANSWER conductor A/an _________________ stops the flow of current. - CORRECT ANSWER insulator A component whose value is measured in microfarads is a: - CORRECT ANSWER capacitor A component whose value is measured in ohms is a: - CORRECT ANSWER resistor Switches are rated in maximum ___________ and ______________. (1) - CORRECT ANSWER current, voltage (1) Fuses are rated in maximum _____________ and ______________. - CORRECT ANSWER current, voltage In an electrical circuit where the voltage and resistance are known, which form of Ohm's law is used to find the circuit current? - CORRECT ANSWER I = E/R A unit of energy is the: - CORRECT ANSWER Joule Which of the following is commonly used to measure electrical energy consumption? - CORRECT ANSWER Kilowatt-Hours The current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance. This is a statement of: - CORRECT ANSWER Ohm's Law Ohm's Law states that voltage is the product of resistance and current. Using algebra, how would you determine the resistance? - CORRECT ANSWER divide the voltage by the current Watt's law states that power is the product of current and voltage. Using algebra, how could the power be determined if resistance and current are known? - CORRECT ANSWER current squared times the resistance What does the M+ key on a calculator do? - CORRECT ANSWER sums the quantity on screen to memory The basic unit of length in the metric system is the ___________. - CORRECT ANSWER meter A 120,000 Ohm resistor can be entered into a calculator using scientific notation as ____________. - CORRECT ANSWER 1.2 x 10^5 Which symbol is used for Ohms of resistance? - CORRECT ANSWER Omega Which symbol means "a change of"? - CORRECT ANSWER Triangle Which metric prefix would be used to represent 1 x 10^6 ? - CORRECT ANSWER Mega Which metric prefix would be used to represent 1 x 10^-3 ? - CORRECT ANSWER Milli Which metric prefix would be used to represent 1 x 10^12 ? - CORRECT ANSWER Tera ________________ is a term used to describe voltage. - CORRECT ANSWER Electromotive force The unit of measurement for electron flow is a(n) ____________. - CORRECT ANSWER ampere A term used to describe opposition to current flow is _______________. - CORRECT ANSWER resistance The basic unit of electric power is the _____________. - CORRECT ANSWER watt In a linear electrical circuit, voltage and current are _______________. - CORRECT ANSWER directly proportional In a series circuit, the current is _________________. - CORRECT ANSWER the same in all parts of the circuit Total power in a series circuit equals the __________________. - CORRECT ANSWER sum of the power dissipated by each resistor The sum of voltage drops in a series circuit: - CORRECT ANSWER equals the applied voltage A decrease in the current of a series circuit can be caused by a: - CORRECT ANSWER resistance increase When the resistance of a series circuit decreases, ________________________. - CORRECT ANSWER total current increases If a series circuit has a current of about 15.4 mA and a source voltage of 20 V, the total resistance is approximately ____________________. - CORRECT ANSWER 1300 ohms If a series circuit has two 13 kΩ resistors with a source voltage of 10 V, the wattage is _________. - CORRECT ANSWER 3.85 mW Kirchoff's voltage law (KVL) states that the total voltage around a closed loop must be zero. (3) - CORRECT ANSWER True (3) When resistors are added in parallel to a parallel circuit, total current ________________. - CORRECT ANSWER Increases In a parallel circuit, total resistance _______________. - CORRECT ANSWER is less than the resistance of any branch In a simple parallel circuit, the voltage across each branch is ________________. - CORRECT ANSWER equal to the source voltage With three 4.5 kΩ resistors and one 1.5 kΩ resistor in parallel, the total resistance is __________. - CORRECT ANSWER 750 ohms Kirchhoff's first law is also know as the principle of conservation of electric charge. It states that at any point, the sum of currents flowing towards that point is equal to the sum of currents flowing away from that point. - CORRECT ANSWER True (4) The total current in a series-parallel circuit equals the _____________. - CORRECT ANSWER applied voltage divided by the total resistance When two 10 kΩ parallel resistors are connected in series with a third 10 kΩ resistor, total resistance (RT) is ____________. - CORRECT ANSWER 15 kiloohms With 70 volts applied to two 30 kΩ resistors in series connected to three30 kΩ resistors in parallel forming a series-parallel circuit, what is the total current? - CORRECT ANSWER 1 mA If a short occurs in the parallel portion of a series-parallel circuit, how will the total resistance be affected? - CORRECT ANSWER It will decrease Thevenin's Theorem states that it is possible to simplify any circuit containing any amount of voltage sources, current sources or resistances, no matter how complex, to an equivalent circuit with just a single voltage source and series resistance connected to a load. (5) - CORRECT ANSWER True (5) Battery cells are connected in parallel to ________________. - CORRECT ANSWER increase current capacity Battery cells are connected in series to _____________________. - CORRECT ANSWER increase voltage output The output of a lead-acid cell is approximately: - CORRECT ANSWER 2.1 V Given a battery rated at 200 ampere-hours, how many hours will the battery be able to provide 10 amperes? - CORRECT ANSWER 20