Power Engineering 4th Class - Electrical Exam Questions And Answers

The atom is the smallest unit of a pure substance and is also known as a(n): a) Molecule b) Compound c) Electron d) Element e) Proton - ANS d) Element [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] A basic law of electricity is: a) Ohm's Law b) Charles Law c) Boyles Law d) Unlike charges attract, like charges repel e) Do not touch live wires - ANS d) Unlike charges attract, like charges repel [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Atoms that have only one electron in its outer orbit such as copper are good conductors. a) True b) False - ANS a) True [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] In an atom, the electrons: a) Orbit around each other b) Orbit around the nucleus c) Are positively charged d) Have the greatest mass e) Orbit only the neutrons - ANS b) Orbit around the nucleus [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] What prevents electrons from flying away from an atom? a) Kinetic energy b) Lack of protons c) Electrical attraction d) Gravity e) Conductance - ANS c) Electrical attraction [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Electrons are negatively charged particles: a) Flowing through the atoms center b) Orbiting about the nucleus of an atom c) Firmly attached to the neutrons of an atom d) That can easily flow through insulators e) That seek open circuits - ANS b) Orbiting about the nucleus of an atom [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Atoms that resist the flow of electrons are known as: a) Conductors b) Insulators c) Semi conductors d) Resistors e) Capacitors - ANS b) Insulators [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Which would be considered a good insulator? a) Glass b) Gold c) Silver d) Copper platinum e) Aluminum - ANS a) Glass [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Semi conductors are neither good conductors nor good insulators because they contain _____ valence electrons. a) 1 b) 2 c) 8 d) 7 e) 4 - ANS e) 4 [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Since the discovery of electrons, it has been determined that electrons are a negative charge and flow from: a) A lower potential to a higher potential b) Negative to positive c) Positive to negative d) The battery to the source e) North to south - ANS b) Negative to positive [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] The smallest part of a compound is called a: a) Atom b) Electron c) Molecule d) Element e) None of the above - ANS c) Molecule [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] The electron theory states that current flows in the direction that electron moves; electrons always move from negative to positive. a) True b) False - ANS a) True [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] The conventional current flow theory states that current flows from the most positive point to the most negative. a) True b) False - ANS a) True [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] In an atom the electrons: a) Are large in size when compared to the protons b) Orbit only the neutrons c) Orbit around each other d) Are repelled by the neutrons e) Are attracted to the protons - ANS e) Are attracted to the protons [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Voltage is also known as: a) Current b) Resistance c) Electromotive force (EMF) d) Transformer e) Capacitor - ANS c) Electromotive force (EMF) [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Voltage is: a) Current b) Electrical pressure c) Ohm d) Electron flow/ second e) Without potential - ANS b) Electrical pressure [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Voltage flows through a wire. a) True b) False - ANS b) False [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Voltage pushes current through a wire. a) True b) False - ANS a) True [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] If an electrical _________ is placed across a conductor, the electrons will drift from the negative end towards the positive end of the conductor. a) Potential b) Current c) Resistance d) Wire e) Meter - ANS a) Potential [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Electromotive force: a) Moves electrons through a conductor b) Is able to move ohms through a resistance c) Is increased by a resistance d) Is increased by a voltage drop e) Induces resistance to an open circuit - ANS a) Moves electrons through a conductor [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Voltage an potential can be used interchargeably a) True b) False - ANS a) True [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] An electrical device which is designed to start and stop current flow is the: a) Potentiometer b) Circuit breaker c) Resistor d) Rheostat e) Switch - ANS e) Switch [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Current flow is: a) Proportional to the applied voltage b) Proportional to the resistance c) Unaffected by the resistance d) Increased when applied voltage decreases e) Inversely proportional to the applied amperage - ANS a) Proportional to the applied voltage [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] The total circuit resistance is less than a value of any individual resistor: a) When voltage is decreased b) When the resistors are wired in parallel c) If the amperage is increased d) When the resistors are wired in series e) When a circuit is opened - ANS b) When the resistors are wired in parallel [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] A conductor's resistance is: a) Directly proportional to its cross-sectional area b) Directly proportional to its diameter c) Inversely proportional to its cross-sectional area d) Unaffected by its cross-sectional area e) Unaffected by its temperature - ANS c) Inversely proportional to its cross-sectional area [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] Fuses or breakers should be installed in electrical circuits to: a) Prevent low voltage b) Prevent electrical shock c) Start and stop equipment d) Prevent overload e) Reduce impedance - ANS d) Prevent overload [[Remember to follow DreadedLlama on Instagram, Twitch, and Twitter ^^!]] The battery of an electric circuit: