electrical craft helper Exam |105 Questions with Answers
a molecule of matter can be divided chemically into smaller particles called? - -atoms
-matter consisting of all the same kind of atoms is called an? - -element
-matter consisting of two or more different kinds of atoms is called a? - -compound
-the negative charge of a single electron is called a? - -unit electrical charge
-most of the mass of an atom is in the? - -nucleus
-when an atom gains an electron, it is called? - -negative ion
-copper is a good conductor, because the copper atom loosely holds it's? - -valence
-gold and silver are good conductor of electricity, because the outer orbits have? - -one
electron
-when teo negatively charged rods are brought together, they? - -repel each other
-one ampere is equal to? - -1 coulomb flowing per second
-what happens when two unlike materials are rubbed together and then separated? - -one
will be positive and the other negative
-connecting two or more metallic objects with a wire or metal strap is called? - -bonding
-grounding minimizes the voltage difference between an object and? - -ground
-humidity has no effect in controlling a static charge on the surface of? - -only liquids.
-a static charge is generated by liquids when the liquids are? - -moving and contact other
materials
-the charges on the surface of a liquid in a container can be made harmless if the container
is? - -purged
-greater static charges are developed on smooth surfaced materials than on rough
surfaced materials because of the? - -larger surface contact
-what is applied to rubber or that leather belts to prevent the generation of static charges?
- -a conductive dressing
-the vest way to remove static electricity from machines is to? - -ground the framework
, -dust can be removed from the and in a plant by the use of a? - -electrostatic precipitation
-the six primary methods of producing a voltage are chemical action , magnetism, friction, -
-heat, light, and pressure
-electricity is produced by chemical action in a?p - -storage battery cell
-through which of the following do electrons move in storage battery cell? - -electrolyte
-in which type of cell does the chemical action dissolve the negative plate, which cannot be
recharged? - -hot cell
-which symbol below represents a battery cell? - -___-[__+
-what is copper and iron wire junction called when heated to produce a voltage? - -
thermocouple
-photoelectric device convert light energy into? - -electrical energy
-what type of cell is a cadmium sulfide (Cds) cell? - -photo conductive
-producing voltage by exerting a pressure on a crystalline substance is called? - -
piezoelectric effect
-what is the purpose of a microphone - -convert sound waves into electrical signals
-the two points of maximum attraction on a magnet are called? - -magnetic materials
-how do magnetic lines of force always arrange themselves? - -form closed loops
-when a permanent magnet is broken into pieces, what happens to each piece? - -becomes
a separate magnet
-what is a coil of wire with an iron core called - -electromagnet
-how many ampere-turn does a coil with 200 turns of wire and 2 amperes of current have?
- -400
-the resistance to magnetic flux is called - -reluctance
-what will serve as an effective magnetic shield against magnetic influence - -an iron or
steel casing
-what is the MKS unit for magnetic flux - -weber
a molecule of matter can be divided chemically into smaller particles called? - -atoms
-matter consisting of all the same kind of atoms is called an? - -element
-matter consisting of two or more different kinds of atoms is called a? - -compound
-the negative charge of a single electron is called a? - -unit electrical charge
-most of the mass of an atom is in the? - -nucleus
-when an atom gains an electron, it is called? - -negative ion
-copper is a good conductor, because the copper atom loosely holds it's? - -valence
-gold and silver are good conductor of electricity, because the outer orbits have? - -one
electron
-when teo negatively charged rods are brought together, they? - -repel each other
-one ampere is equal to? - -1 coulomb flowing per second
-what happens when two unlike materials are rubbed together and then separated? - -one
will be positive and the other negative
-connecting two or more metallic objects with a wire or metal strap is called? - -bonding
-grounding minimizes the voltage difference between an object and? - -ground
-humidity has no effect in controlling a static charge on the surface of? - -only liquids.
-a static charge is generated by liquids when the liquids are? - -moving and contact other
materials
-the charges on the surface of a liquid in a container can be made harmless if the container
is? - -purged
-greater static charges are developed on smooth surfaced materials than on rough
surfaced materials because of the? - -larger surface contact
-what is applied to rubber or that leather belts to prevent the generation of static charges?
- -a conductive dressing
-the vest way to remove static electricity from machines is to? - -ground the framework
, -dust can be removed from the and in a plant by the use of a? - -electrostatic precipitation
-the six primary methods of producing a voltage are chemical action , magnetism, friction, -
-heat, light, and pressure
-electricity is produced by chemical action in a?p - -storage battery cell
-through which of the following do electrons move in storage battery cell? - -electrolyte
-in which type of cell does the chemical action dissolve the negative plate, which cannot be
recharged? - -hot cell
-which symbol below represents a battery cell? - -___-[__+
-what is copper and iron wire junction called when heated to produce a voltage? - -
thermocouple
-photoelectric device convert light energy into? - -electrical energy
-what type of cell is a cadmium sulfide (Cds) cell? - -photo conductive
-producing voltage by exerting a pressure on a crystalline substance is called? - -
piezoelectric effect
-what is the purpose of a microphone - -convert sound waves into electrical signals
-the two points of maximum attraction on a magnet are called? - -magnetic materials
-how do magnetic lines of force always arrange themselves? - -form closed loops
-when a permanent magnet is broken into pieces, what happens to each piece? - -becomes
a separate magnet
-what is a coil of wire with an iron core called - -electromagnet
-how many ampere-turn does a coil with 200 turns of wire and 2 amperes of current have?
- -400
-the resistance to magnetic flux is called - -reluctance
-what will serve as an effective magnetic shield against magnetic influence - -an iron or
steel casing
-what is the MKS unit for magnetic flux - -weber
