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In electrical engineering, a limit switch is a switch operated by the motion of a machine part or the presence of an object. A limit switch can be used for controlling machinery as part of a control system , as a safety interlock , or as a counter enumerating objects passing a point.
In electrical engineering, an electrical isolation test is a direct current (DC) or alternating current (AC) resistance test that is performed on sub-systems of an electronic system to verify that a specified level of isolation resistance is met. Isolation testing may also be conducted between one or more electrical circuits of the same ...
Following a 1987 train collision in Maryland, freight trains in high-speed areas were required to have speed limiters that could forcibly slow trains, rather than just alerting the operator through in-cab signals. In the Maryland crash, the signal panel had been partially disabled, including a muted whistle and a missing light bulb.
Analog multimeter Digital multimeter. A multimeter (also known as a volt-ohm-milliammeter, volt-ohmmeter or VOM) [1] is a measuring instrument that can measure multiple electrical properties. [2] [3] A typical multimeter can measure voltage, resistance, and current, [4] in which case can be used as a voltmeter, ohmmeter, and ammeter.
It is alongside Atlantic City International Airport [2] in Egg Harbor Township, New Jersey, [3] 10 miles (16 km) northwest of Atlantic City, and covers over 5,000 acres (2,023 ha). The Technical Center consists of laboratories, test facilities, support facilities, the Atlantic City International Airport, and a non-commercial aircraft hangar.
Railroads have strict government-approved air brake testing procedures for various circumstances when assembling trains or switching out cars en route. After a cut is made between cars in a train and the train is rejoined, in addition to other tests, the crew must verify that the brakes apply and release on the rear car (to ensure that all of ...
The heating oil futures contract trades in units of 1,000 barrels (160 m 3) with a minimum fluctuation of $0.0001 per gallon and (for the USA) is based on delivery in New York Harbor. [5] The Department of Energy tracks the prices homeowners pay for home heating fuel (oil and propane).
On February 22, 2012, a drunk driver on the Harbor Freeway mistakenly entered the bus-only station area of the Harbor Freeway station. The driver, 51-year-old Stephen L. Lubin of Sun Valley, was traveling 80 miles per hour (130 km/h) in his 2009 Honda Fit (15 mph (24 km/h) over the freeway's posted speed limit ) as he entered the station and ...
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