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Number of trads = number of riser – 1. Tread is the horizontal part of a step.

There are 3 types of triangles based on the length of sides of the triangle

Equilateral triangle- when all 3 sides of a triangle are equal
Isosceles triangle – when 2 sides of a triangle are equal
Scalene triangle- No side have equal dimension

The Widely used projection system is I angle projection and III angle projection which the object is imagined to be placed in I quadrant and III quadrants respectively.

In first angle projection, the object is between the observer and vertical plane

In third angle projection, the vertical plane is between the observer and the object

Skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor.

P=VI; I = Q/t
P=VQ/t

One (metric) Horse Power is approximately 735.49875 Watts (SI)

A moving coil meter measures average, or if connected to a DC source it will measure positive and negative depending on the polarity of the source.

Electrical degrees in a motor has to do with the magnetic position of the rotor. One transition from “North” to “South” to “North” again equals 360 electrical degrees.

T=1/f = 1/50 = 0.02 seconds

Pipe electrodes shall not be smaller than 38 mm internal diameter if made of galvanized iron or steel, and 100 mm internal diameter if made of cast iron.
The depth at which the pipe must be buried depends on the moisture of the ground.
The minimum depth at which the pipe must be buried in pipe earthing is 3.75 meters.

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