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Electrical Engineering Test Questions and Answers: Circuit Theory and Components, Exams of Social Sciences

United States International UniversitySocial Sciences

A question and answer format overview of fundamental electrical concepts and components. It covers topics such as resistance, ohm's law, kirchhoff's laws, inductors, capacitors, ac signals, magnetism, and various electrical components like relays, ammeters, and transformers. The document serves as a quick reference or study guide for electrical engineering students or technicians, offering concise explanations and definitions of key terms and principles. It also includes practical information such as color codes for resistors and formulas for calculating electrical values, making it a useful resource for understanding basic electrical theory and applications. Designed to facilitate learning and review of essential electrical engineering concepts.

Typology: Exams

2024/2025

Available from 06/30/2025

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MTA ELECTRICAL TEST QUESTIONS & ANSWERS
Resistance - Answers - a measure of how much a disturbance can affect flows of
energy
Resistance is measured in - Answers - ohms
Resistance is ___________ in series circuit - Answers - Additive
Resistance in parallel - Answers - 1/Rt = 1/R1 + 1/R2
Derivation - Answers - Used for two resistors in parallel
Color codes for resistors - Answers - sequence of colors that indicate resistance and
tolerance
Band A - Answers - first digit of the value of the resistor
Band B - Answers - second digit of the value of the resistor
Band C - Answers - Decimal multiplier
Band D - Answers - tolerance of the value of the resistor
Black - Answers - Value of 0
Brown - Answers - Value of 1
Red - Answers - Value of 2
Orange - Answers - Value of 3
Yellow - Answers - Value of 4
Green - Answers - Value of 5
Blue - Answers - Value of 6
Violet - Answers - Value of 7
Gray - Answers - Value of 8
White - Answers - Value of 9
Gold - Answers - Tolerance of 5%
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Download Electrical Engineering Test Questions and Answers: Circuit Theory and Components and more Exams Social Sciences in PDF only on Docsity!

MTA ELECTRICAL TEST QUESTIONS & ANSWERS

Resistance - Answers - a measure of how much a disturbance can affect flows of energy Resistance is measured in - Answers - ohms Resistance is ___________ in series circuit - Answers - Additive Resistance in parallel - Answers - 1/Rt = 1/R1 + 1/R Derivation - Answers - Used for two resistors in parallel Color codes for resistors - Answers - sequence of colors that indicate resistance and tolerance Band A - Answers - first digit of the value of the resistor Band B - Answers - second digit of the value of the resistor Band C - Answers - Decimal multiplier Band D - Answers - tolerance of the value of the resistor Black - Answers - Value of 0 Brown - Answers - Value of 1 Red - Answers - Value of 2 Orange - Answers - Value of 3 Yellow - Answers - Value of 4 Green - Answers - Value of 5 Blue - Answers - Value of 6 Violet - Answers - Value of 7 Gray - Answers - Value of 8 White - Answers - Value of 9 Gold - Answers - Tolerance of 5%

Silver - Answers - Tolerance of 10% No color - Answers - Tolerance of 20% Easy way to remember the colors - Answers - Bad boys race our young girls behind victory garden walls Ohm's Law - Answers - the current in a circuit equals the voltage difference divided by the resistance Ohm's law formula - Answers - V=IR Kirchhoff's voltage Laws - Answers - In a simple series circuit the algebraic sum of the voltages around the circuit is zero Kirchoff's Voltage Law - Answers - In a parallel circuit the voltages in each of the individual branches are equal to each other as well as equal to the total circuit voltage Inductors - Answers - a coil of wire that stores energy in a magnetic field Henries - Answers - Induction is measured in ________. Inductive Reactance - Answers - The opposition to current flow by an inductor in an AC circuit. Inductive Reactance Formula - Answers - XL = 2πfL Capacitors - Answers - have the ability to store and discharge electrical potential energy Capacitors in series formula - Answers - 1/C=1/C₁+1/C₂+... Capacitors in Parallel Equation - Answers - C=C₁+C₂+C₃+... AC cycle - Answers - A complete AC cycle includes current flowing in one direction, reversing, and flowing in the opposite direction. Five main ac signals - Answers - Sawtooth, rectangular, sinusoidal, trapezoid, square Magnetism - Answers - The force of attraction or repulsion of magnetic materials 3 basic properties of magnetism - Answers - Permeability, reluctance, retentivity reluctance - Answers - Property of a metal that opposes lines of flux going through it Retentivity - Answers - Ability of a magnetized metal to stay magnetized

bridge circuit - Answers - a circuit that consists of four sections connected in series to form a closed loop. Bus bar - Answers - A primary power distribution point, connected to a main power source. Capacitor - Answers - Two electrodes or sets of electrodes in the form of plates Circuit - Answers - the complete path that an electric current travels along Circuit breaker - Answers - a switch that opens when the current in a circuit is too high Circular Mil - Answers - a area equals to that of a circle that has a 0.001" diameter. coaxial cable - Answers - A transmission line consisting of two conductors concentric with and insulated from each other Commuter - Answers - The copper segment on the armature of a motor or generator Conductance - Answers - The ability of a material to conduct or carry an electric current. Conductivity - Answers - The ease with which a substance transmits electricity Conductor - Answers - A material that allows heat and electricity to pass through it. Core - Answers - A magnetic material that affords an easy path for magnetic flux lines in a coil Current Limiter - Answers - A protective device similar to a fuse, usually used in high amperage circuits Cycle - Answers - One complete positive and one complete negative alternation of a current or voltage Direct Current (DC) - Answers - Electric current that flows in only one direction only Eddy Current - Answers - Induced circulating currents in a conducting material that are caused by a varying magnetic field. Efficiency - Answers - The ratio of output power to input power generally expressed as a percentage Electrolyte - Answers - A solution of a substance which is capable of conducting electricity.

Electromagnet - Answers - A magnet made by a passing current through a coil of wire wound on a soft iron core Energy - Answers - the ability to do work Field - Answers - The space containing electric or magnetic lines of force Flux field - Answers - the magnetic field formed by magnetic lines of force Frequency - Answers - The number of complete cycles per second existing in any form of wave motion Full Wave Rectifier - Answers - Uses positive and negative charge of AC voltage to produce DC voltage. Fuse - Answers - A protective device inserted in series with a circuit , also a safety device with a thin metal strip that will melt if too much current passes through a circuit Galvanometer - Answers - a device that uses an electromagnet to measure electric current Generator - Answers - A machine that converts mechanical energy into electrical energy Ground - Answers - A metallic connection with the earth to establish ground potential. Henry - Answers - The basic unit of inductance horsepower - Answers - a common unit of power, equal to about 746 watts Impedance - Answers - resistance to the flow of energy Inductance - Answers - The property of a circuit which tends to oppose a change in the existing current Induction - Answers - The act or process of producing voltage by the relative motion of a magnetic field across a conductor inphase - Answers - Applied to the condition that exists when two waves of the same frequency pass through their maximum and minimum values of like polarity at the same instant Inversely - Answers - Inverted or reversed in position Joule - Answers - unit of energy

Polarity - Answers - The character of having magnetic poles or electrical charges Pole - Answers - a place on a magnet where magnetism is strongest Polyphase - Answers - A circuit that uses more than one phase of alternating current Potential - Answers - The amount of charge held by a body as compared to another point or body, usually measured in volts Potentiometer - Answers - A variable voltage divider; a resistor which has a variable contact arm so that any portion of the potential applied between its ends may be selected. Power - Answers - the rate at which work is done Proton - Answers - A subatomic particle that has a positive charge and that is found in the nucleus of an atom Ratio - Answers - The value obtained by dividing one number by another, indicating their relative proportions Reactance - Answers - The opposition offered to the flow of an alternating current by the inductance, capacitance or both in any circuit Rectifiers - Answers - Convert AC to DC Relay - Answers - an electromagnetic switch that can be used as a remote control retentivity - Answers - A measure of a materials ability to retain magnetism rheostat - Answers - variable resistor What is a saturable reactor? - Answers - A control device that uses a small DC current to control large AC current. How does a saturable reactor control AC current? - Answers - By controlling core flux density. saturation - Answers - the condition existing in any circuit when an increase in the driving signal produces no further change in the resultant effect series wound - Answers - a motor or generator in which the armature is wired in series with the field winding servo - Answers - a device used to convert a small movement into one greater movement or force

Servomechanism - Answers - am closed loop system that produces a force to position an object in accordance with eh information that originated at the input solenoid - Answers - an electromagnetic coil that contains a movable plunger synchroscope - Answers - an instrument used to indicate a difference in frequency between two ac sources synchro system - Answers - A remote instrument indicating system. tachometer - Answers - an instrument for indicating revolutions per minute tertiary winding - Answers - a third winding on a transformer or magnetic amplifier that is used a s second control winding thermistor - Answers - a resistor that is used to compensate for temperature variations in a circuit torque - Answers - the turning effort or twist which as shaft sustains when transmitting power transformer - Answers - a device composed of two or more coils linked by magnetic lines of force used to transfer energy from one circuit to another transmission lines - Answers - any conductor or system of conductors used to caryy electrical energy form its source to a load vars - Answers - abbreviation for volt ampere reactive vector - Answers - a line used to represent both directions and magnitude volt - Answers - the unit of electrical potential voltmeter - Answers - an instrument designed to measure a difference in electrical potential in volts watt - Answers - unit of electrical power wattmeter - Answers - an instrument for measuring electrical power in watts bevel gears - Answers - are shaped like sections of cones and used to transmit power between shafts whose axis intersect pulleys - Answers - are wheels used to transmit power from a motor to drive the roller of a conveyer belt.