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The standard ratio of height to length of an arrow in dimensioning should be kept only 1:3.
Even if there are so many types of arrows like oblique stroke, closed, open small open circle etc.
Generally closed and filled arrowhead is widely used and with 1:3 ratio.

We can draw perpendicular lines using three methods. In one method, if the point is nearer to the centre of the line to which the perpendicular is to be made then we can use the bisector method where we cut two arcs on the line and from those intersections we cut another to the point.

There are two ways by which we can draw parallel lines to an existing line. The first method is when we have to draw parallel lines to a line through a given point. The other method is to draw parallel lines to a line through a given distance.

While drawing perpendicular line through a point which is nearer to the middle of a given line, an arc is cut at two points on the line. From these two intersection points, we draw other arcs with same radius and they are made to cut each other.

When the resistance is connected in series the voltage across a load is dropped because some voltage drop occurs in the resistor.

Voltage, electric potential difference, electric pressure or electric tension is the difference in electric potential between two points. The difference in electric potential between two points in a static electric field is defined as the work needed per unit of charge to move a test charge between the two points.

A perfect engineering drawing should have the following information

1 Shape of an object

2 Exact Sizes and tolerances of various parts of the object

3 The finish of the product

4 The details of materials

5 The company?s name

6 Catalogue no of the product

7 Date on which the drawing was made

8 The person who made the drawing

The size of the title block is 185mm x 65 mm which is recommended by B.I.S. (Bureau of Indian Standards), where 25mm x 10mm is for scale in drawing sheet. Within the title box there will be so many sections divided like Name of the firm, Drawing No, Title, etc.

A four-stroke engine is an internal combustion engine that utilises four distinct piston strokes (intake, compression, power, and exhaust) to complete one operating cycle.
A complete operation in a four-stroke engine requires two revolutions of the crankshaft.
In a four stroke engine one power stroke occurs in 2 revolutions. So speed of engine = 3000 x 2 = 6000 rpm.
Since it takes two crankshaft revolutions to complete one four-stroke cycle, the complete cycle will be completed at half the engine RPM e.g engine running at 6000 RPM will complete 3000 complete cycles in one minute.

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