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The siemens (symbol: S) is the unit of electric conductance, electric susceptance, and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively; hence one siemens is equal to the reciprocal of one ohm (Ω −1) and is also referred to as the mho.
The Siemens investment of some $6 billion to acquire PGBU from CBS Corp. (oka Westinghouse Electric Corp.) quickly paid off and, in spite of the bubble bursting shortly thereafter, is still providing good returns. Perhaps as foretold 30 years ago, the gas turbine service business is a major revenue and profit generator for Siemens Energy today.
The LMS100 PA produces approximately 100 MW at an efficiency of around 46% LHV in open cycle operation. It is currently the largest and most efficient aero-derivative gas turbine.
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The GE AC4400CW, , sometimes referred as "AC44CW", is a 4,400 horsepower (3,300 kW) diesel-electric locomotive that was built by GE Transportation Systems between 1993 and 2004. It is similar to the Dash 9-44CW , but uses AC traction motors instead of DC, with a separate inverter per motor.
The GE Passport is a high bypass ratio turbofan. The engine is a twin-spool, axial-flow turbofan with a high bypass ratio of 5.6:1 and an overall pressure ratio of 45:1. The front fan is attached to the three-stage low-pressure compressor; the 23:1 pressure ratio 10-stage high-pressure compressor includes five blisk stages for weight reduction.
* Note: two versions: one contained a 16-cylinder 7HDL, co-developed by GE and the German firm Deutz-MWM, rated at 6000 HP; the other a 16-cylinder 7FDL rated at 4390 HP. The units equipped with the 7FDL were a sub-version AC6000 "Convertible" and were produced to get the type into operation while the 7HDL was developed.
Towards the end of production, GE added an independent axle suspension to new 25-tonners, a feature shared with the GE 35-ton switcher. [6] Many customers made modifications to their 25-tonners after purchase, ranging from minor changes such as moving the bell to completely replacing the prime mover and adding an independent brake .