Metropolitan Transportation Authority (MTA) Electrical Practice Test

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• A rheostat is defined as?
• Which color corresponds to the value 0?
• Which term describes a flash caused by an electric current ionizing a gas or vapor?
• What term describes a subatomic particle that has a positive charge and is found in the nucleus of an atom?
• What are the two battery types named in the material?
• Which device is used to convert alternating current into direct current?
• What term describes the phenomenon when current flows through a conductor and a magnetic field forms around it?
• Resistor color codes convey which two attributes?
• Which term describes one complete positive and negative alternation of a waveform?
• Which term describes a conductor that also conducts heat?
• What is induction in electrical terms?
• Kilo is a prefix meaning which value?
• In a series circuit, what is the total resistance relative to the individual resistances?
• Which color corresponds to the value 7?
• Which instrument measures electrical power in watts?
• Resistance to the flow of energy is called what?
• Which term refers to a network of resistors used to reduce voltage, current, or power delivered to a load?
• An inductor is defined as what?
• What is a saturable reactor?
• Reluctance is defined as:
• Which color corresponds to the value 5?
• Which term matches the definition: a rotary magnetic or dynamo-electric amplifier used in servomechanism and control applications?
• What is the basic unit of electrical current?
• Which component is an electromagnetic coil with a movable plunger?
• Which material is typically described as having high permeability and low retentivity and is suitable for transformer cores?
• Inphase describes which condition?
• Which option lists both described types together?
• Which term denotes a line that represents both directions and magnitude?
• What term describes induced circulating currents in a conducting material caused by a varying magnetic field?
• How many types of batteries are described in the material?
• Which term describes a device that interrupts current to protect circuits by opening the path when fault current occurs?
• Milliammeter is which of the following?
• Which statement best reflects the material's classification of batteries?
• Which of the following is a coil of wire that stores energy in a magnetic field?
• Which term is defined as the complete path that an electric current travels along?
• Which term refers to a third winding on a transformer used as a second control winding?
• Which term describes a circuit that consists of four sections connected in series to form a closed loop?
• What is a watt?
• Which color corresponds to the value 2?
• Which option correctly states the number and names of the battery types described?
• Which color corresponds to the value 9?
• Band B on a resistor color code represents which part of the value?
• Which term characterizes the rate of performing electrical work per unit time?
• Which material is used for transformer cores due to high permeability and low retentivity?
• Saturation in a circuit refers to?
• Which term is a transmission line consisting of two conductors concentric with and insulated from each other?
• What is the maximum instantaneous value of an alternating voltage or current measured in either positive or negative direction?
• What value is assigned to White?
• Which instrument is used to measure resistance?
• What term describes the measure of the ease with which magnetic lines of force can flow through a material compared to air?
• What term describes a circuit that uses more than one phase of alternating current?
• Which term is defined as a primary power distribution point connected to a main power source?
• Which term refers to a device used to store energy electrostatically, formed by two plates?
• How does a saturable reactor control AC current?
• Which equation expresses the total capacitance for capacitors connected in parallel?
• The parallel resistance derivation is used for how many resistors in parallel?
• Which option is NOT one of the two battery types described?
• Kirchhoff's Voltage Law for a simple series circuit states what?
• Which component transmits power between intersecting shafts?
• Which term refers to the rotating part of an electrical machine that carries current and interacts with the magnetic field to produce torque?
• In resistor tolerance color code, Gold indicates a tolerance of what percentage?
• Which particle has the weight of a proton but carries no electrical charge?
• Magnetic amplifier refers to which device?
• Band A on a resistor color code represents which part of the value?
• Which rule uses the left hand to determine the direction of electron flow around a coil?
• Which device uses a small DC current to control a larger AC current?
• Which instrument indicates revolutions per minute?
• Which term describes a closed-loop system that positions an object in accordance with input information?
• Which option identifies the two battery types described?
• What term describes a device used to increase the signal voltage, current or power?
• Which option mentions the two types together as a pair?
• Which of the following statements about inductive reactance is true?
• A metallic connection with the earth to establish ground potential is called what?
• What is a line of force in a field?
• Which term describes a material that allows heat and electricity to pass through it?
• Which type of electric current flows in only one direction?
• Which term describes a solution of a substance capable of conducting electricity?
• Resistance is measured in which unit?
• What term refers to a place on a magnet where magnetism is strongest?
• Which material is described as having high retentivity?
• Which is an electromagnetic coil that contains a movable plunger?
• What describes the Magnetic circuit?
• Which color equals the digit 7 in this color-code mapping?
• Which term is defined as the ease with which a substance transmits electricity?
• Inductive Reactance is defined as the opposition to current flow caused by an inductor in an AC circuit. Which option correctly identifies this concept?
• Which set comprises the three basic properties of magnetism?
• Which device converts a small movement into a larger movement or force?
• Which prefix means one thousand?
• The mnemonic phrase is used to remember resistor color codes. Which component uses color codes that this mnemonic helps remember?
• Which color indicates a tolerance of 10% in resistor tolerance codes?
• In a series-wound machine, how is the armature connected with the field winding?
• Which protective device is typically used in high current circuits and functions similarly to a fuse?
• Which category do the two identified types belong to?
• What value is assigned to Black?
• Which term is the complete path of magnetic lines of force in a magnetic circuit?
• What is the primary function of a relay in electrical circuits?
• Which term refers to the central part of an atom that is mainly comprised of protons and neutrons?
• What is the definition of transmission lines in electrical systems?
• An ammeter is used to measure what in a circuit?
• Which term denotes the third winding on a transformer used as a second control winding?
• Color codes for resistors indicate resistance and tolerance.
• Which instrument for measuring currents in milliamperes?
• Which term means the ability to do work?
• Which instrument measures potential difference in volts?
• Which term describes a device used to increase the signal voltage, current, or power?
• What is the general term for the ability to do work?
• Which term describes the circulating currents induced in a conductor by a changing magnetic field?
• An ampere-turn is defined as the magnetizing force produced by a current of one ampere flowing through a coil of how many turns?
• What is inductance?
• What is the magnet called that is formed by passing current through a coil of wire wound on a soft iron core?
• What is defined as one complete positive and one complete negative alternation of a current or voltage?
• Which instrument is used for checking insulation resistance on motors, feeders, bus bar systems, grounds, and branch circuit wiring?
• The unit used to measure inductance is called what?
• Which instrument uses an electromagnet to measure electric current?
• Which property describes a material's memory of magnetism after magnetization is removed?
• The number of complete cycles per second in any wave motion is called what?
• What is a magneto?
• In a resistor color code, band D indicates what property?
• In a parallel circuit, the voltages across each branch are equal to what?
• A machine that converts mechanical energy into electrical energy is called what?
• Battery is defined as:
• Which term means the central part of an atom?
• What term describes a magnet created by running an electric current through a coil around a soft iron core?
• Which term describes a transformer in which the primary and secondary are connected together in one winding?
• The prefix meaning one millionth is represented by which of the following options?
• A protective device inserted in series with a circuit that melts if too much current passes through is called what?
• Which instrument indicates a difference in frequency between two AC sources?
• Which term is a unit of area used for sizing wires, equal to the area of a circle with diameter 0.001 inch?
• An alternating current (AC) cycle is defined as:
• Which term is defined as two electrodes or sets of electrodes in the form of plates?
• Which term is defined as the ability of a material to conduct or carry an electric current?
• What is the turning effort or twist that a shaft sustains when transmitting power called?
• Which statement best describes magnetism?
• Which protective device melts its fusible link when the current exceeds safe limits?
• Which option lists the two battery types described?
• Which term describes metal contacts that open and close a circuit at times intervals?
• Negative charge is defined as which of the following?
• The basic unit of inductance is called what?
• Which formula represents the capacitance for capacitors connected in series?
• Resistance is a measure of how much a disturbance can affect flows of energy.
• What term describes the character of having magnetic poles or electrical charges?
• Which statement best defines reactance?
• Which term refers to an area equal to that of a circle with a 0.001 inch diameter?
• What is a wattmeter?
• In a two-resistor parallel network, the reciprocal of the total resistance equals the sum of the reciprocals of the individual resistances.
• Rectifiers perform which function?
• What is a voltmeter?
• Which of the following are the three basic properties of magnetism?
• Which term refers to a device that converts a small movement into a greater movement or force?
• What is the process of increasing the strength of a signal?
• Which variables determine inductive reactance?
• What does the abbreviation VAR stand for in electrical terms?
• Band C on a resistor color code represents which part of the value?
• A relay is best described as?
• An ampere-turn is defined as the magnetizing force produced by a current of one ampere flowing through a coil of how many turns?
• Which color corresponds to the value 4?
• Which term describes the opposition to current flow in a circuit that is particularly associated with alternating current and frequency effects?
• Which combination describes steel's magnetic properties?
• Which protective device melts its fusible link when current exceeds safe levels?
• The joule is the unit of which quantity?
• Which prefix means one millionth?
• Which term is defined as a prefix meaning one million?
• Which device is used to measure insulation resistance?
• A line of force is defined as what?
• Inversely refers to which description?
• No color on a resistor indicates a tolerance of which percentage?
• Pulleys are best described as:
• Induction is measured in which unit?
• Band D on a resistor color code represents which property?
• Which term describes the opposition to AC flow produced by inductance or capacitance?
• A device that uses an electromagnet to measure electric current is called what?
• What term denotes the time in electrical degrees by which one wave leads or lags another?
• Capacitors have the ability to store and discharge electrical potential energy. Which statement best describes this behavior?
• Which device is a saturable reactor used to amplify or control in a circuit?
• Soft iron is best described as having which magnetic properties?
• Bevel gears are used for:
• The unit used to measure resistance is the ohm.
• Joule is the unit of which physical quantity?
• Which color is linked with the digit 4 in the color code mapping?
• Which term denotes the process of increasing the strength of a signal?
• Which option lists the two battery types in standard form?
• Which equation represents Ohm's Law in a resistive circuit?
• What transformer has the primary and secondary connected together in one winding?
• Which term names the particle with a positive charge located in the nucleus?
• What term refers to a magnetic material that affords an easy path for magnetic flux lines in a coil?
• What is the volt, in electrical terms?
• Which term describes a circuit that uses more than one phase of alternating current?
• Ohm's Law formula is V = IR. Which of the following expresses Ohm's Law in a way that is clearly incorrect?
• Which term refers to a transmission line consisting of two conductors that are concentric and insulated from each other?
• Which option correctly names both battery types in a concise form?
• Which term refers to a device used to reduce voltage, current, or power delivered to a load?
• Which color is assigned to the value 3 in the color code?
• Which component is a resistor used to compensate for temperature variations in a circuit?
• In a simple series circuit, which statement is true about voltages?
• Load in electrical terms is best described as?
• Reluctance in a magnetic circuit is most analogous to which electrical quantity?
• The material lists how many types of relays?
• What term is defined as the amount of charge held by a body as compared to another point or body, usually measured in volts?
• What term is a variable voltage divider with a movable contact arm so that any portion of the potential applied between its ends may be selected?
• How many distinct battery types are described?
• Megohm is associated with which prefix meaning 'one million'?
• Which device converts chemical energy into electrical energy?
• Which device is composed of two or more coils linked by magnetic lines of force used to transfer energy between circuits?
• What is a ratio?
• Which circuit consists of four sections connected in series to form a closed loop?
• Which color represents the value 1?
• If color Green is used, what value does it map to?
• A device uses the positive and negative charges of AC voltage to produce DC voltage. What is it called?
• Which device is composed of two or more coils linked by magnetic lines of force used to transfer energy from one circuit to another?
• Which option accurately represents the two battery types described?
• Which term is a device used to adjust and control voltage by sliding a contact along a resistive path?
• Which magnetic property describes how easily a material becomes magnetized in a magnetic field?
• For capacitors connected in parallel, which statement is true?
• Which term describes a protective device that opens the circuit when current is too high?
• Which color corresponds to the value 8?
• For two resistors in parallel, which equation correctly expresses the relationship for the total resistance Rt?
• Which choice is a direct restatement of the two battery types described?
• Retentivity is defined as the ability of a magnetized metal to do what?
• The mnemonic 'Bad boys race our young girls behind victory garden walls' is used as an easy way to remember the colors for which electrical component?
• What is the term for the space containing electric or magnetic lines of force?
• What term denotes the rate at which work is done?
• Resistance is additive in a series circuit.
• A common unit of power, equal to about 746 watts, is called what?
• Which prefix means one thousandth?
• Inductance is measured in which unit?
• What term describes a load greater than the rated load of an electrical device?
• Which of the following is NOT one of the five main AC signal types listed: sawtooth, rectangular, sinusoidal, trapezoid, square?
• What is the formula for inductive reactance?
• Which term describes a closed-loop system that produces a force to position an object according to input information?
• Retentivity measures what property?
• Which term is a remote instrument indicating system?
• Which color corresponds to the value 6?
• Which term is used to name the difference in phase angle between two sinusoidal signals?
• In electrical terminology, what does a vector represent?
• The magnetic field formed by magnetic lines of force is called what?
• In a series-wound machine, the armature is connected in series with the field winding.
• If a circuit has a voltage difference of 12 V and a resistance of 3 ohms, what is the current according to Ohm's Law?
• What is the term for a solution of a substance that is capable of conducting electricity?