AMT General – Fundamentals of Electricity Practice Exam

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• Which material has the lowest magnetic permeability among common conductors listed?
• A 12-volt electric motor has 1,000 watts input and 1 horsepower output. Maintaining the same efficiency, how much input power will a 24-volt, 1-horsepower electric motor require?
• The electrolyte of a nickel-cadmium battery is highest when the battery is
• Nickel-cadmium batteries stored for a long period of time will show a low liquid level because
• Which expression gives the impedance magnitude of an AC series circuit with R, XL, and Xc?
• What is the voltage across terminals A and B in the given circuit?
• Two equal capacitors of 100 μF each are connected in series. The total capacitance is
• In electrical circuit diagrams, what does the ground symbol indicate?
• One horsepower equals 746 watts. What is the power in watts of a 2-horsepower motor?
• Which is correct in reference to electrical resistance?
• How much power is being furnished to the circuit?
• Which term means .001 ampere?
• What unit is used to express electrical power?
• What quantity is associated with energy dissipation as heat due to resistance?
• With an ohmmeter connected across a 10-ohm resistor, what will the ohmmeter read?
• Which of the following best describes the operating principal in a nickel-cadmium battery installed in an aircraft?
• Which statement is correct about a parallel circuit?
• A typical application for Zener diodes is as
• What is the opposition to the flow of alternating current produced by a magnetic field with generated back voltage (EMF) called?
• What may result if water is added to a nickel-cadmium battery when it is not fully charged?
• When electrical power is applied to the bus, which relays are energized?
• The end-of-charge voltage of a 19-cell nickel-cadmium battery, measured while still on charge,
• One horsepower equals how many watts?
• Which of these will cause the resistance of a conductor to decrease?
• During charging a nickel-cadmium battery, the cells emit gas most noticeably when?
• In a circuit, current I can be calculated as I equals P divided by V. Which expression represents this relationship?
• In the same 30 V circuit, what is the voltage across the 20 Ω resistor?
• For a logic gate, if any input is high, the output is high. Which option best describes this behavior?
• In a parallel circuit, what property is the same across all capacitors?
• A 12-cell lead-acid battery has an open-circuit voltage of 2.1 V per cell. What is the total open-circuit voltage?
• Which component stores energy in an electric field?
• Capacitance is increased by increasing plate area and decreasing by increasing plate separation. Which statement is correct?
• A 30-volt, 0.5-horsepower motor operating at 85% efficiency draws how many amperes from the bus?
• What is the total capacitance of a circuit containing three capacitors in parallel with capacitances of 0.02 microfarad, 0.05 microfarad, and 0.10 microfarad, respectively?
• What is the basic unit of electrical quantity?
• In a parallel circuit with four equal resistors across a 24-volt source, what is the voltage across resistor three (VR3)?
• Which component is commonly used as a rectifier in electrical circuits?
• A 24-volt motor draws 15 amperes from the power bus. What is the electrical power drawn?
• What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?
• In a parallel DC circuit, which statement is true?
• When more than two inductors of different inductances are connected in parallel in a circuit, the total inductance
• The opposition offered by a coil to the flow of alternating current (disregard resistance) is called?
• The unit of electrical resistance is the
• In a parallel circuit, increasing the number of identical resistors lowers the equivalent resistance.
• Which effect does not apply to the movement of electrons in a conductor?
• Two inductors with inductances of 4 millihenries and 3 millihenries are connected in series. What is the total inductance?
• With power to the bus and the fuel selector switched to the right-hand tank, how many relays in the system are operating?
• The method used to rapidly charge a nickel-cadmium battery utilizes which charging profile?
• In a circuit diagram, the total current flowing in the wire between points C and D is
• Typical application for Zener diodes is as
• Forward biasing of a solid-state device will cause the device to
• The potential difference between two insulated conductors is measured in which unit?
• What is the total resistance of three resistors connected in series with values 3 ohms, 5 ohms, and 22 ohms?
• 2/1,000th of a KV equals how many volts?
• Which statements about charging several aircraft batteries together are generally true?
• In a functional logic gate circuit, the output will be 0 when
• What happens to the current in a voltage step-up transformer with a ratio of 1 to 4?
• The power dissipated by a resistor can be calculated as
• In a locomotive control circuit, the warning horn will not sound if an open occurs in wire No. 5 while the throttles are retarded with only the right gear down.
• The unit of inductive reactance is
• Find the voltage across the 8-ohm resistor.
• Which action strengthens a coil inductor?
• What is the measured voltage of the series-parallel circuit between terminals A and B?
• In a step-up transformer with a turns ratio of 1:4, which statement is true?
• Which of the following correctly gives the total capacitance of three parallel capacitors with 0.01 microfarad, 0.02 microfarad, and 0.04 microfarad?
• Which energy form does not apply to the movement of electrons in a conductor?
• In an ac circuit, the effective voltage is
• In a Ni-Cd battery, when the positive plates slowly give up oxygen which is regained by the negative plates, what is occurring?
• When the landing gears are up and the throttles are retarded, the warning horn will not sound if an open occurs in wire No. 6.
• The working voltage of a capacitor in an ac circuit should be
• If R2 sticks in the up position, the light will
• Total generator power for the described loads is approximately?
• In a landing gear warning circuit, an open in which wire will prevent the warning horn from sounding when the landing gear are up and the throttles are retarded?
• The presence of any small amount of potassium carbonate deposits on the top of nickel-cadmium battery cells in service indicates which condition?
• A fully charged lead-acid battery will not freeze until extremely low temperatures because
• If two 24-volt lights, each drawing 3 amperes, are connected in parallel, what is the total current drawn?
• What is the unit used for electrical resistance?
• In a resistive circuit with several resistors in parallel across a voltage source, the voltage across each resistor is:
• Which symbol represents a variable resistor?
• In the landing gear system, placing the control valve switch in the neutral position serves to:
• In a parallel circuit with two equal resistors and a supply of 24 V, if the total current is 2 A, what is the resistance of each resistor?
• A 48-volt source furnishes 192 watts to a parallel circuit consisting of three equal resistors. What is the value of each resistor?
• Which change will directly increase the amount of charge stored on a capacitor if the voltage across it remains fixed?
• Which condition indicates improperly torqued cell link connections of a nickel-cadmium battery?
• In an N-P-N transistor application, the solid-state device is turned on when the
• The resistance of a conductor depends on
• In a purely resistive circuit, if the applied voltage is doubled, what happens to power?
• 0.002KV equals how many volts?
• One horsepower equals how many watts?
• The basis for transformer operation in AC is mutual inductance.
• An increase in which of the following factors will cause an increase in the inductive reactance of a circuit?
• During charging, rising temperature in a nickel-cadmium cell causes which change in internal resistance?
• When referring to an electrical circuit diagram, what point is considered to be at zero voltage?
• If 3 coulombs of charge pass a point in 6 seconds, what is the current?
• In a parallel circuit with a 30-volt supply powering two lamps, the voltage across each lamp is:
• A thermal switch, or thermal protector, as used in an electric motor, is designed to
• A lead-acid battery with 12 cells connected in series (no-load voltage = 2.1 volts per cell) furnishes 10 amperes to a load of 2-ohms resistance. The internal resistance of the battery in this instance is
• For a two-input AND gate with A = 1 and B = 0, the output is
• Z = Impedance R = Resistance XL = Inductive Reactance Xc = Capacitive Reactance What is the impedance of an ac-series circuit consisting of an inductor with a reactance of 10 ohms, a capacitor with a reactance of 4 ohms, and a resistor with a resistance of 8 ohms?
• With the landing gear retracted, the red indicator light will not come on if an open occurs in which wire?
• In a P-N-P transistor, which condition turns the device on?
• A 1-horsepower, 24-volt DC motor that is 80 percent efficient requires 932.5 watts. How much power will a 1-horsepower, 12-volt DC motor that is 75 percent efficient require?
• The amount of electricity a capacitor can store is directly proportional to
• What does the ground symbol primarily provide in circuit diagrams?
• In circuit diagrams, the symbol corresponding to number 5 represents which component?
• Which arrangement requires the most electrical power during operation?
• Which unit is used to measure electric charge?
• The correct way to connect a test voltmeter in a circuit is
• A heating element rated at 5 A is connected to 24 V. What is its power?
• Which arrangement requires the most electrical power?
• In an ideal transformer, the ratio of secondary voltage to primary voltage equals the turns ratio.
• Which device converts AC to DC?
• What does the letter Q symbolize when measuring electrical charge?
• A 24-volt source is required to furnish 48 watts to a parallel circuit consisting of two resistors of equal value. What is the value of each resistor?
• If resistor R5 is disconnected at the junction of R4 and R3, what will the ohmmeter read?
• Operating resistance of a 30-watt light bulb designed for a 28-volt system?
• In a circuit with an applied voltage of 30 volts and a load consisting of a 10-ohm resistor in series with a 20-ohm resistor, what is the voltage drop across the 10-ohm resistor?
• In a parallel circuit, the voltage across each branch is equal to the source voltage.
• Which statement about parallel circuits is not true?
• Which component is a potentiometer?
• Diodes are used in electrical power supply circuits primarily as
• In a circuit with 30 V across two series resistors of 10 Ω and 20 Ω, what is the current through the circuit?
• In a circuit with multiple capacitors in parallel, the total capacitance increases which of the following?
• If each cell, connected in series, equals 2 volts, how would a 12-cell lead acid battery be rated?
• If a 230 V supply draws 20 A, what is the input power?
• What will be the effect if the PCO relay fails to operate when the left-hand tank is selected?
• Which quantity is defined as the flow of electric charge per unit time?
• Unless otherwise specified, any values given for current or voltage in an ac circuit are assumed to be
• A motor has 1,000 watts input and delivers 746 watts output. What is its efficiency?
• In AC circuits, true power is which of the following relative to the apparent power?
• In a series circuit, the total resistance equals the sum of the individual resistances.
• In a parallel circuit with four 6-ohm resistors across a 24-volt battery, what is the total voltage across resistor-three (VR3) in the circuit?
• Which is the correct formula that defines Current?
• If resistor R3 is disconnected at terminal D, what will the ohmmeter read?
• When different rated capacitors are connected in parallel, the total capacitance is which of the following?
• During troubleshooting of an open circuit with a voltmeter connected across the circuit, which observation is expected?
• The capacitance of a capacitor is proportional to which factors?
• In a series circuit, which statement is true?
• Which of the following statements is generally true regarding charging several aircraft batteries together? 1. Batteries of different voltages (but similar capacities) can be connected in series with each other across the charger, and charged using the constant current method. 2. Batteries of different ampere-hour capacity and same voltage can be connected in parallel with each other across the charger, and charged using the constant voltage method. 3. Batteries of the same voltage and same ampere-hour capacity must be connected in series with each other across the charger, and charged using the constant current method.
• When more than two inductors of different inductances are connected in parallel, the total inductance is:
• A fully charged lead-acid battery will not freeze until extremely low temperatures are reached because:
• Which statement best explains why a fully charged lead-acid battery resists freezing?
• If the cross-sectional area of a conductor is quadrupled while length and temperature remain constant, what happens to the resistance?
• In nickel-cadmium batteries, a rise in cell temperature tends to
• What is the correct way to connect a test voltmeter in a circuit for measuring the voltage across a component?
• Through which material will magnetic lines of force pass the most readily?
• In a parallel resistor network, the total resistance is which of the following?
• A circuit has a 28-volt supply and a total resistance of 20 ohms. The total current flow is
• Which statement about hydrometer readings for a lead-acid battery electrolyte is true?
• In a circuit with a fixed resistance, the voltage drop across the resistor depends on which quantity?
• In a resistor following Ohm's law, increasing voltage while resistance remains constant will result in
• How can the state-of-charge of a nickel-cadmium battery be determined?
• How much power must a 24-volt generator furnish to a system which contains the following loads? One motor (75% efficient) 1/5 hp; Three position lights 20 watts each; One heating element 5 amp; One anti-collision light 3 amp.
• Which statement about capacitors in DC circuits is true?
• In a parallel circuit with three equal resistors across a constant source, the total resistance equals
• Energize the circuit with the fuel tank selector switch selected to the left-hand position. Using the schematic, identify the switches that will change position.
• Nickel-cadmium battery cases and drain surfaces, which have been affected by electrolyte, should be neutralized with a solution of
• When the landing gear is down, the green light will not come on if an open condition occurs in which wire?
• What is the unit of electromotive force (EMF) in electrical systems?
• How many amperes will a 28-volt generator be required to supply to a circuit containing five lamps in parallel, three of which have a resistance of 6 ohms each and two of which have a resistance of 5 ohms each?
• Which statement describes constant-voltage charging for nickel-cadmium batteries?
• The total resistance of the circuit is equal to
• Three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series in a 28-volt circuit. How much current will flow through the 3-ohm resistor?
• A voltmeter to measure the voltage across a load should be connected
• Ohm's Law relates current, voltage, and resistance; which formula is correct?
• If a voltmeter is properly connected across a closed switch in a powered circuit, what will it read?
• In a capacitor, energy is stored in which form?
• The purpose of providing a space underneath the plates in a lead-acid battery's cell container is to
• If a component in a circuit is opened, an ohmmeter reading across the network tends to be:
• The No. 7 wire is used to
• What is the likely result of servicing and charging nickel-cadmium and lead acid batteries together in the same service area?
• What is the total capacitance of a circuit containing three capacitors with capacitances of 0.25 microfarad, 0.03 microfarad, and 0.12 microfarad, respectively?
• The TCO relay will operate when 24 V DC is applied to the bus and the fuel tank selector is in which position?
• A 24-volt source furnishes 48 watts to a parallel circuit consisting of four equal resistors. What is the voltage drop across each resistor?
• Three 6 Ω resistors in parallel connected to a 28 V source. What is the total current drawn from the source?
• For a fixed supply voltage, increasing circuit resistance will
• The term that describes the combined resistive forces in an ac circuit is
• A 24-volt DC motor that requires 932.5 watts would draw approximately how many amperes?
• A motor of 1/5 hp (0.2 hp) with 75% efficiency has an electrical input power of approximately?
• Under which condition will a ground be provided for the warning horn through both gear switches when the throttles are closed?
• How do you convert farads to microfarads?
• If the 0.03 μF capacitor is removed from a parallel network of 0.25 μF, 0.03 μF, and 0.12 μF, what is total capacitance?
• A 14-ohm resistor is in a circuit carrying 0.05 ampere. How much power does the resistor dissipate?
• A device that stores energy in a magnetic field is called a
• In a parallel circuit with three 6-ohm resistors across a 12-volt battery, what is the total current (I)?
• Which component stores energy primarily in a magnetic field?
• Which factor does not directly affect the end-of-charge voltage of a nickel-cadmium battery when it remains on charge?
• A cabin entry light of 10 watts and a dome light of 20 watts are connected in parallel to a 30-volt source. If the voltage across the 10-watt light is measured, it will be
• Diodes are used in electrical power supply circuits primarily as
• If an open occurs at R1, the light
• Which procedure should be followed if electrolyte from a lead-acid battery is spilled in the battery compartment?
• Which of the following best describes the contributing factors to thermal runaway in a nickel-cadmium battery installed in an aircraft?
• How many instruments (voltmeters and ammeters) are installed correctly?
• Regarding a parallel circuit, which statement is correct?
• If a thermal protector switch activates to prevent overheating damage to an electric motor, once the motor has cooled;
• Electrostatic fields are also known as
• Which phenomenon allows energy to transfer between circuits without a direct conductor?
• To convert farads to picofarads, which operation is correct?
• How much current does a 30-volt, 1/2 horsepower motor that is 85-percent efficient draw from the bus?
• Transfer of electric energy from one circuit to another without the aid of electrical connections is called
• In a parallel circuit, the total current drawn from the source is:
• In a parallel circuit, the voltage across each branch is
• In a parallel circuit, which statement is true?
• Which of the following formulas defines current?
• During discharge, nickel-cadmium batteries show a lower liquid level than at full charge because:
• When different rated capacitors are connected in series in a circuit, the total capacitance is