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Dishwasher: Quiz


Question 1: In such dishwashers the electromechanical rotary switch often used to control the washing cycle is replaced by a microprocessor but most sensors and ________ are still required to be present.
ValveEngineDiesel engineInternal combustion engine

Question 2: Rinse aid (sometimes called rinse agent) contains ________ that uses Marangoni stress to prevent droplet formation, so that it drains from the surfaces in thin sheets, rather than forming droplets.
Perfluorooctanoic acidAmphiphileSurfactantSodium lauryl sulfate

Question 3: ________ should not be cleaned in a dishwasher as the corrosive effect of dishwasher detergent is high on such types of glass—that is, it will quickly go 'cloudy'.
OpticsLead glassCorningWareBorosilicate glass

Question 4: Commercial dishwashers work similar to a commercial ________ with "teeth" pulling the rack through a small chamber.
Surface runoffCar washChlorineAcid

Question 5: If the dishwasher has run out of the salt that recharges the ________ that softens the water, and the water supply is "hard", limescale deposits can appear on all items, but are especially visible on glassware.
MetalIon-exchange resinUraniumChlorine

Question 6: Cochrane was quite wealthy and was the granddaughter of John Fitch, the inventor of the ________.
SteamboatNew EnglandPaddle steamerMississippi River

Question 7: Using blankets, panels, and sound-absorbing materials in various configurations, dishwashers can achieve sound damping levels down to 39 ________ or so.
DecibelSound pressureLogarithmNoise (electronics)

Question 8: The inside of a dishwasher, called the tub, can be composed of ________ or stainless steel.
PolycarbonatePolystyrenePlasticPolyvinyl chloride

Question 9: In some countries, especially those in Europe, dishwashers include a built-in ________.
Water softeningHard waterWater purificationPotassium

Question 10: In 1924, ________ invented a small dishwasher suitable for domestic use.
EnglandBritish ArmyWilliam Howard LivensLivens Projector

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