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Direct current: Quiz

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Question 1: Very large quantities of direct-current power are used in production of ________ and other electrochemical processes.
AluminiumTitaniumCopperGold

Question 2: Most ________ circuits require a DC power supply.
Electrical engineeringEngineeringElectronic engineeringElectronics

Question 3: ________ communication equipment, such as DSLAM, uses standard -48V DC power supply.
1ESS switchPanel switchCrossbar switchTelephone exchange

Question 4: The first commercial electric power transmission (developed by ________ in the late nineteenth century) used direct current.
Thomas EdisonElihu ThomsonEdwin J. HoustonAlexander Graham Bell

Question 5: Direct current may be obtained from an alternating current supply by use of a current-switching arrangement called a rectifier, which contains ________ elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction.
Electrical engineeringElectronic engineeringElectronicsEngineering

Question 6: Direct current is used for some ________ propulsion, especially in urban areas.
TransportTrain stationRail transportTrain

Question 7: Direct current may flow in a conductor such as a wire, but can also be through ________, insulators, or even through a vacuum as in electron or ion beams.
Quantum mechanicsPhysicsCondensed matter physicsSemiconductor

Question 8: For applications requiring direct current, such as third rail power systems, alternating current is distributed to a substation, which utilizes a ________ to convert the power to direct current.
DiodeRectifierHigh-voltage direct currentVacuum tube

Question 9: Most automotive applications use DC, although the ________ is an AC device which uses a rectifier to produce DC.
Nikola TeslaElectrical generatorAlternatorMagnetic field

Question 10: Direct current is produced by such sources as batteries, thermocouples, solar cells, and commutator-type electric machines of the ________ type.
DynamoGramme machineElectrical generatorElectric motor







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