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The siemens (symbolized S) is the Standard International (SI) unit of electrical conductance. The archaic term for this unit is the mho (ohm spelled backwards). Siemens are also used, when multiplied by imaginary numbers, to denote susceptance in alternating current (AC) and radio frequency (RF) applications.

Wave winding has 2 parallel paths and Lap winding has number of parallel paths equal to number of poles.

Admittance Y = G jB

Where G = Conductance

B = susceptance.

So Admittance is vector sum of Conductance and susceptance.

Impedance Z = R jX

1N = One PN junction

400 = Serial number

7 = current rating is 7A

In case of two current carrying conductors kept side by side, same current attracts and opposite currents repels.

Can be verified by using right hand thumb rule to find the magnetic field direction of conductors and then using Fleming’s left hand rule for direction of force.

Thin sheet metal can be cut to shape quickly with hand shears or snips. Bent snips are used in cutting small curves.

In a Shaper machine Work piece stationary and tool reciprocates

Clapper box is used in Shaper machine . Clapper box is a a hinged part on the toolhead of a reciprocating machine (as a planer or shaper) that permits the tool to clear the workpiece on the return stroke.

The irregular shaped work pieces are clamped on a lathe by using Four jaw chuck . This four- jaw independent chuck has four jaws; each of which can be adjusted independently by a chance wrench. They are used to held wound, square, hexagonal, and irregular-shaped workpieces. The jaws can be reversed to hold work by the inside diameter.

Transformers and alternators are rated in KVA/MVA as these are AC power supply devices whose power factor is not constant.

For motors or loads with known power factor, rating is in terns of real power of KW.

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