Electrical craft helper Exam Questions And Answers

a molecule of matter can be divided chemically into smaller particles called? - ANS atoms matter consisting of all the same kind of atoms is called an? - ANS element matter consisting of two or more different kinds of atoms is called a? - ANS compound the negative charge of a single electron is called a? - ANS unit electrical charge most of the mass of an atom is in the? - ANS nucleus when an atom gains an electron, it is called? - ANS negative ion copper is a good conductor, because the copper atom loosely holds it's? - ANS valence gold and silver are good conductor of electricity, because the outer orbits have? - ANS one electron when teo negatively charged rods are brought together, they? - ANS repel each other one ampere is equal to? - ANS 1 coulomb flowing per second what happens when two unlike materials are rubbed together and then separated? - ANS one will be positive and the other negative connecting two or more metallic objects with a wire or metal strap is called? - ANS bonding grounding minimizes the voltage difference between an object and? - ANS ground humidity has no effect in controlling a static charge on the surface of? - ANS only liquids. a static charge is generated by liquids when the liquids are? - ANS moving and contact other materials the charges on the surface of a liquid in a container can be made harmless if the container is? - ANS purged greater static charges are developed on smooth surfaced materials than on rough surfaced materials because of the? - ANS larger surface contact what is applied to rubber or that leather belts to prevent the generation of static charges? - ANS a conductive dressing the vest way to remove static electricity from machines is to? - ANS ground the framework dust can be removed from the and in a plant by the use of a? - ANS electrostatic precipitation the six primary methods of producing a voltage are chemical action , magnetism, friction, - ANS heat, light, and pressure electricity is produced by chemical action in a?p - ANS storage battery cell through which of the following do electrons move in storage battery cell? - ANS electrolyte in which type of cell does the chemical action dissolve the negative plate, which cannot be recharged? - ANS hot cell which symbol below represents a battery cell? - ANS ___-[__+ what is copper and iron wire junction called when heated to produce a voltage? - ANS thermocouple photoelectric device convert light energy into? - ANS electrical energy what type of cell is a cadmium sulfide (Cds) cell? - ANS photo conductive producing voltage by exerting a pressure on a crystalline substance is called? - ANS piezoelectric effect what is the purpose of a microphone - ANS convert sound waves into electrical signals the two points of maximum attraction on a magnet are called? - ANS magnetic materials how do magnetic lines of force always arrange themselves? - ANS form closed loops when a permanent magnet is broken into pieces, what happens to each piece? - ANS becomes a separate magnet what is a coil of wire with an iron core called - ANS electromagnet how many ampere-turn does a coil with 200 turns of wire and 2 amperes of current have? - ANS 400 the resistance to magnetic flux is called - ANS reluctance what will serve as an effective magnetic shield against magnetic influence - ANS an iron or steel casing what is the MKS unit for magnetic flux - ANS weber the process by which metals are demagnetized is called - ANS degaussing hardened steel is difficult to magnetize demagnetized is called - ANS low permeability what term is often used, instead of voltage, for electrical pressure? - ANS wattage which of the following provides the electrical potential for an electrical system? - ANS generator to measure electrical potential, you should use a? - ANS voltmeter how should a voltmeter be connected in a circuit to measure voltage? - ANS in parallel with the potential points being measured without a given potential, how do free elections in a conductor constantly move? - ANS in a random manner the instrument that measures electrical current is the? - ANS ammeter an ammeter must be connected in the circuit in such a way that? - ANS all current flows through it