What is S2-30min?

What year was the electric locomotive invented? Basic parts and functions of an analog multi tester? Do electrolytic capacitors generally have polarity? Is a 3350X Brushless motor compatible with a XL-5 ESC? What are the roles of a diode and a capacitor in an AC-DC converter? Which types of transformers used in industries? What is the best ground for a conductive work bench? What type of gas use in sodium lamp? What are symmetrical and unsymmetrical faults? What is mean SL in SL100 transistor? What are 3 sources of EMF? What is meant by transformer charging? What is compounding curve in synchronous motor? Is transformer is a device? What is material constant of a semiconductor? What grades do you need to become a electrician? What is the difference between mva and mw? One millivolt is equal to? Which one of the following parts of a universal motor does not move a armature b the field coil c the shaft d the commutator? What kind of experience does one need to operate lighting equipment?