Electronics ETA Certification Practice Exam with 100% correct answers(latest update)

The "triboelectric effect" causes what kind of electricity? Static The law of static electrical charges states: like charges repel Minute particles that make up all possible elements and still retain the unique chemical characteristics of the element are called _____________. Atoms A molecule is the smallest particle of matter that can exist by itself. (1) True (1) A basic atom must contain what two types of subatomic particles? Electron and proton An electron has _______________. a Negative charge What two types of energy are used throughout electronics? Kinetic and potential Electrical direct current flowing in a wire produces a magnetic field: at right angles to current flow A material is magnetized when the: domains are in alignment A material that can be magnetized easily falls into this category: Ferromagnetic Invisible lines of force that surround a magnet are called ___________________. magnetic flux lines The pole of a magnet from which flux leaves is called the __________________. north _________________ force produces magnetic flux. Magnetomotive What class of fire extinguisher is used on an oil fire? B It is dangerous to use wooden handled tools around high voltage due to their ability to absorb moisture. (2) True (2) In order to eliminate possible fire hazards, rags should be stored in ________________ metal containers When an individual receives an electrical shock, an immediate symptom can be _______________. Cardiac arrest What happens as protective eye goggles age? Their resistance to scratching decreases Safety precautions to be followed when working on high-voltage equipment include which of the following? All jewelry should be removed The main purpose of a safety observer is to: 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: • could damage the equipment • both could be injured • could ruin an electronic device Which device would most likely include a light level meter? Camera The most common functions of a generic multimeter are _________________________. voltmeter, ammeter and ohmmeter Digital multimeters eliminate which of the following disadvantages of analog meters? • Low impedance • Poor accuracy • Parallax errors The Wheatstone bridge can be used for precision measurements of: resistance The ammeter setting on a multimeter indicates what type of reading? current A resistor with color bands of blue, gray and black has a value of _______________. 68 ohms 20% A/an _____________ allows current to flow easily. conductor A/an _________________ stops the flow of current. insulator A component whose value is measured in microfarads is a: capacitor A component whose value is measured in ohms is a: resistor Switches are rated in maximum ___________ and ______________. (1) current, voltage (1) Fuses are rated in maximum _____________ and ______________. 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? I = E/R A unit of energy is the: Joule Which of the following is commonly used to measure electrical energy consumption? 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: Ohm's Law