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  2. Preload (engineering) - Wikipedia

    en.wikipedia.org/wiki/Preload_(engineering)

    It is also used in testing a specimen, for a process where the crosshead moves to load the specimen to a specified value before a test starts. Data is not captured during the preload segment. When tensile specimens are initially placed into testing grips, they can be subjected to small compressive forces. These forces can cause specimens to ...

  3. Mattydale lay - Wikipedia

    en.wikipedia.org/wiki/Mattydale_lay

    [3] [4] [5] There are several different types of "hose loads" in use, which is the way the hose is folded in the lay: Accordion load – The hose is loaded so that when it is flat, it is standing on end. The finished load resembles an accordion. Flat load – The flat hose is simply placed in the track so that it is stacked.

  4. Double tee - Wikipedia

    en.wikipedia.org/wiki/Double_tee

    Diagram of double tee beam. A double tee or double-T beam is a load-bearing structure that resembles two T-beams connected to each other side by side. The strong bond of the flange (horizontal section) and the two webs (vertical members, also known as stems) creates a structure that is capable of withstanding high loads while having a long span.

  5. Glossary of firefighting equipment - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_firefighting...

    A preconnected attack line that is typically 1¾" diameter, and stored either on the front bumper of the apparatus or in an exterior (exposed) side well. Trash lines are typically shorter length than cross-lays , and are intended for use against dumpster fires, etc., where a longer length of hose (and consequent rebedding after the suppression ...

  6. Mathematics of three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_three-phase...

    With linear loads, the neutral only carries the current due to imbalance between the phases. Devices that utilize rectifier-capacitor front ends (such as switch-mode power supplies for computers, office equipment and the like) introduce third order harmonics.

  7. Power-flow study - Wikipedia

    en.wikipedia.org/wiki/Power-flow_study

    In power engineering, the power-flow study, or load-flow study, is a numerical analysis of the flow of electric power in an interconnected system. A power-flow study usually uses simplified notations such as a one-line diagram and per-unit system, and focuses on various aspects of AC power parameters, such as Voltage, voltage angles, real power and reactive power.

  8. Delta-wye transformer - Wikipedia

    en.wikipedia.org/wiki/Delta-wye_transformer

    An example delta-wye transformer schematic. A delta-wye transformer is a type of three-phase electric power transformer design that employs delta-connected windings on its primary and wye/star connected windings on its secondary.

  9. Ultimate load - Wikipedia

    en.wikipedia.org/wiki/Ultimate_load

    In engineering, the ultimate load [1] is a statistical figure used in calculations, and should (hopefully) never actually occur. Strength requirements are specified in terms of limit loads (the maximum loads to be expected in service) and ultimate loads (limit loads multiplied by prescribed factors of safety).