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Questions and Answers
What is the total resistance when three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series?
What is the total resistance when three resistors of 3 ohms, 5 ohms, and 22 ohms are connected in series?
How much current will flow through a 3-ohm resistor in a 28-volt series circuit?
How much current will flow through a 3-ohm resistor in a 28-volt series circuit?
What will the ohmmeter read if resistor R(3) is disconnected at terminal D?
What will the ohmmeter read if resistor R(3) is disconnected at terminal D?
What voltage is measured across an 8-ohm resistor when an ohmmeter is connected?
What voltage is measured across an 8-ohm resistor when an ohmmeter is connected?
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What occurs if an open circuit occurs in wire no. 6?
What occurs if an open circuit occurs in wire no. 6?
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How many relays in the system are operating when power is supplied to the bus and the fuel selector is switched to the right-hand tank?
How many relays in the system are operating when power is supplied to the bus and the fuel selector is switched to the right-hand tank?
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What is the total resistance of each resistor in a parallel circuit that requires 192 watts at 48 volts, consisting of three resistors of equal value?
What is the total resistance of each resistor in a parallel circuit that requires 192 watts at 48 volts, consisting of three resistors of equal value?
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If the fuel pressure crossfeed valve is open, what would be the indication?
If the fuel pressure crossfeed valve is open, what would be the indication?
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What must be true for the TCO relay to operate?
What must be true for the TCO relay to operate?
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Which relays are energized when electrical power is applied to the bus?
Which relays are energized when electrical power is applied to the bus?
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What is the total current flow in the circuit if the resistance is 21.2 ohms and voltage is 28 volts?
What is the total current flow in the circuit if the resistance is 21.2 ohms and voltage is 28 volts?
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What happens to the red indicator light when the landing gear is retracted if an open occurs in wire No. 7?
What happens to the red indicator light when the landing gear is retracted if an open occurs in wire No. 7?
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Which of the following components is identified as a potentiometer in the schematic?
Which of the following components is identified as a potentiometer in the schematic?
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What is the purpose of static dischargers in electrical systems?
What is the purpose of static dischargers in electrical systems?
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When energizing the circuit with the fuel tank selector switch selected to the left-hand position, which switches are involved?
When energizing the circuit with the fuel tank selector switch selected to the left-hand position, which switches are involved?
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Which method is not recommended for cleaning deicer boots?
Which method is not recommended for cleaning deicer boots?
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What type of generator is least likely used as an airplane generator?
What type of generator is least likely used as an airplane generator?
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What is the primary function of a rectifier?
What is the primary function of a rectifier?
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What is the most probable cause of a thermal runaway in a nickel-cadmium battery?
What is the most probable cause of a thermal runaway in a nickel-cadmium battery?
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When handling a high voltage capacitor in an electrical circuit, what precaution should be taken?
When handling a high voltage capacitor in an electrical circuit, what precaution should be taken?
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What could indicate that a transformer winding has some turns shorted together during operation?
What could indicate that a transformer winding has some turns shorted together during operation?
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In a 24-volt DC system, if one generator shows low voltage, what is the likely cause?
In a 24-volt DC system, if one generator shows low voltage, what is the likely cause?
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If navigation lights are controlled by one switch, how are the lights likely configured?
If navigation lights are controlled by one switch, how are the lights likely configured?
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In an AC transformer, if the secondary has twice the number of loops as the primary, what can be inferred about the voltage?
In an AC transformer, if the secondary has twice the number of loops as the primary, what can be inferred about the voltage?
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What must be equal for ac generators to be operated in parallel?
What must be equal for ac generators to be operated in parallel?
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Which method is used to maintain a constant voltage output from an aircraft generator?
Which method is used to maintain a constant voltage output from an aircraft generator?
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What part do the pole pieces or shoes belong to in a dc generator?
What part do the pole pieces or shoes belong to in a dc generator?
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How many cycles of ac voltage does a six-pole alternator produce for each revolution of the rotor?
How many cycles of ac voltage does a six-pole alternator produce for each revolution of the rotor?
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In an ac circuit with no phase lead or lag, what is true?
In an ac circuit with no phase lead or lag, what is true?
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A CSD unit that is disconnected in flight due to a malfunction can be reconnected:
A CSD unit that is disconnected in flight due to a malfunction can be reconnected:
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What is the purpose of a rectifier in an electrical system?
What is the purpose of a rectifier in an electrical system?
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What should the working voltage of a capacitor in an ac circuit be?
What should the working voltage of a capacitor in an ac circuit be?
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Study Notes
Resistance and Current Flow
- A circuit with three resistors in series (3 ohms, 5 ohms, and 22 ohms) connected to a 28-volt source will have a current flow of 0.93 amperes through the 3-ohm resistor.
- Disconnecting a resistor in a series circuit results in an infinite resistance.
- An ohmmeter connected to a circuit will measure the total resistance of the circuit.
- The total resistance of a circuit can be calculated by adding the individual resistances of each component.
- In a parallel circuit, the total resistance is less than the smallest resistance in the circuit.
- The total current flowing through a parallel circuit can be calculated by dividing the total voltage by the total resistance.
- The value of each resistor in a parallel circuit with a voltage source of 48 volts and a total power of 192 watts will be 36 ohms.
Electrical Systems
- An open in wire number 6 in the landing gear system will prevent the green light from illuminating when the landing gear is down.
- Failure of the PCO relay will prevent the fuel pressure crossfeed valve open light from illuminating when the left-hand tank is selected.
- With power to the bus and the fuel selector switched to the right-hand tank, three relays in the system will be operating.
- Energizing the circuit with the fuel tank selector switch selected to the left-hand position will result in changes to the position of switches 5, 6, 11, 12, 13, 15, and 16.
- The component represented by number 5 in the schematic is a variable capacitor.
Aircraft Electrical Systems
- The warning horn will not sound if an open occurs in wire number 4 when the landing gears are up, and the throttles are retarded.
- LORAN systems use pulsed signals transmitted from ground stations to determine aircraft location.
- Integrated drive generators (IDG) use a brushless system to produce current.
- A contaminated IDG scavenge oil filter may indicate a problem with the IDG.
- A short in the up limit switch may cause the green light to illuminate and the red light to remain lit after the landing gear extension cycle.
- If any one generator in a 24-volt dc system shows low voltage, the most likely cause is an out of adjustment voltage regulator.
- The strength of the magnetic field can be varied to maintain a constant voltage output from an aircraft generator.
- The pole pieces or shoes used in a dc generator are a part of the field assembly.
- A six-pole alternator of the revolving-field type produces three cycles of ac voltage for each revolution of the rotor.
- A series-wound dc electric motor typically requires more current at low rpm compared to high rpm.
- The purpose of a rectifier in an electrical system is to change alternating current to direct current.
- Before removing a high voltage capacitor from an electrical circuit, it should be fully discharged.
- Excessive current draw from a nickel-cadmium battery can lead to thermal runaway.
- A shorted winding in a transformer can cause it to get hot during normal operation.
- Navigation lights connected in parallel are connected in series with the switch.
- The secondary voltage in an ac transformer with twice as many loops as the primary will be greater, and the amperage will be less than in the primary.
- Battery number 3 in the schematic is connected incorrectly.
- Real power equals apparent power in an ac circuit with no phase lead or lag.
- A CSD unit disconnected in flight due to a malfunction can only be reconnected on the ground by maintenance personnel.
- A CSD unit drives a generator through the use of a variable hydraulic pump and hydraulic motor.
Electrical Components and Circuits
- The working voltage of a capacitor in an ac circuit should be at least 50 percent greater than the highest applied voltage.
- The total power being furnished to the circuit in Figure 4 is 2,645 watts.
- Disconnecting resistor R(5) at the junction of R(4) and R(3) as shown in Figure 6 will result in an ohmmeter reading of 3.0 volts.
- The measured voltage of the series-parallel circuit between terminals A and B in Figure 10 is 3.0 volts.
- Two instruments (voltmeters and ammeters) are installed correctly in Figure 9.
- Static dischargers dissipate static electricity into the atmosphere at low current levels to help eliminate radio interference.
- Soap and water can be used to clean deicer boots.
- A rectifier changes alternating current to direct current.
- A series-wound DC generator is not used as an airplane generator.
- The purpose of a CSD unit is to drive the generator.
- The CSD unit is driven by a hydraulic motor.
- An excessive load or a short circuit can lead to excessive heat in a transformer and the failure of the winding.
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Description
Test your knowledge on circuit behaviors, current flow, and resistance in electrical systems. This quiz covers key concepts such as series and parallel circuits, total resistance calculations, and the implications of an open circuit. Perfect for students learning electrical principles.
