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A pulley consists of a wheel with a grooved rim and a block which holds it. A rope runs in the groove around the wheel and one end will usually be attached to either: a weight, a fixed object like the ceiling or to another pulley. Pulleys are often used to lift things. For example, a pulley could be attached to an overhead beam and a rope could be run up and over the pulley to [...]

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Gears and Gear Trains

A gear is essentially a toothed wheel or cylinder that works in tandem with another gear (or gears) to transmit motion, or to change speed or direction. A gear train is a mechanical system formed by mounting gears on a frame so that the teeth of the gears engage. At its simplest, a gear train has a drive gear that will typically be connected to a motor and a driven gear [...]

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Fault Diagnosis

Fault Diagnosis questions are likely if you are applying for a position as an electrical engineer or technician. They are used in assessing skills for technical personnel who need to be able to find and repair faults in electronic control systems. These types of faults are often caused by the failure of a single component within the system, but because the component has fail [...]

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Simple Electrical Circuits

Simple electrical circuits can be represented by circuit diagrams, in which the various components in the circuit are shown by using standard symbols like those illustrated below. These diagrams are usually restricted to showing the power source (battery), switches, loads (typically bulbs), and the path of the wiring. To answer these questions you need a basic understanding of [...]

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