KNOW THE PURPOSE OF HOLE IN WASHBASIN !

You all must have seen the hole in the washbasin. Have you ever wondered, what is the purpose of these holes on the side of a sink. We will discuss the purpose of the hole in the washbasin in this article.

This opening is located on the wall of the basis nearest to you, near the top of the basin. The overflow opening serves two important functions:

1.)If the water tap is left on while the drain stopper is closed, the opening will channel water down into the drain opening rather than letting is spill out of the sink onto the floor.

2.)The overflow allows the sink to drain faster by introducing air into the system.

Preventing Overflow:

If you close the drain of your bathroom sink and fill up the sink basin to the level of the overflow hole, the water will begin draining into the overflow opening and down the drain. This helps prevent the water from spilling over the top of the basin, but because sink overflow holes are usually small, they may not prevent an overflow for very long.

Improving Drainage:

The sink overflow helps the basin drain faster by allowing air into the drain pipe via the overflow channel. When there's enough water in the basin to completely cover the drain opening, the drain can't get air through the water, creating a suction effect that slows the flow of water going down the drain. But with the overflow feeding air to the drain pipe, the suction effect is reduced and the water drains much faster. By contrast, sinks that don't have overflow openings commonly send up bubbles as they drain, and they typically drain more slowly.

Different sinks have varying designs along with hole types and where they are located. Some might be on the same side of the basin, whereas others might be located under the faucet or at the sink’s opposite side. The difference in the placement of these holes is meant for aesthetic reasons only.

KNOW WHY SECOND AND FOURTH ANGLE PROJECTION IS NOT USED IN ENGINEERING DRAWING !!

In Mechanical Engineering,drawings are made either in first angle projection or in third angle projection.We do not make drawings in second or fourth angle projection.We will discuss the reason behind doing so in this article.

Read this if you want to know difference between first angle and third angle projection.

DIFFERENCE BETWEEN FIRST ANGLE AND THIRD ANGLE PROJECTION EXPLAINED !!

Let us first understand the concept behind the angle projection system. Imagine you have Vertical Plane (VP) and Horizontal Plane (HP) (Perpendicular to each other),now we have 4 quadrants. For 1st angle projection system, we place object in 1st quadrant, for 2nd angle projection system, we place object in 2nd quadrant and so on.

In Second quadrant, Vertical plane (VP) lies in between object  and observer. Therefore front view of the object will lie on vertical plane whereas top view will lie on horizontal plane. As per rule of projection when horizontal plane is rotated 90 degree in clockwise direction, top and front view will overlap.

Overlapping projection views create confusion in the drawing. Therefore 2nd angle projection system is not used.

Similarly when object is placed in 4th quadrant both top and front view will overlap. Therefore fourth angle projection is also not used. 

To sum up, because of overlapping of front and top views 2nd and 4th angle projections are not used. First and third angle projection systems are recommended for orthographic projections.

KNOW WHY KTM IS FAST AND ROYAL ENFIELD IS SLOW !!

Royal Enfield despite of having 350 CC Engine is able to reach a top speed of 90-100 kmph whereas KTM Duke 390 is having 373 CC Engine is able to attain 160 to 165 kmph. Which simply means power of Duke 390 is way ahead of RE 350.

Now,coming to torque figures of both machine.Duke 390 produces 35 N⋅m @ 7250 rpm whereas RE 350 produces 28 Nm at 4000 rpm, which simply means maximum torque of RE 350 comes at very early stage whereas Duke 390 takes time to attain its maximum torque.In short we can say that RE 350 is a better pulling machine.

Now the question is that,what makes Duke 390 a fast machine despite of having almost same capacity engine.The technology used by Duke 390 is way ahead of RE 350. It uses DOHC,Liquid cooling and other latest technologies.Also Duke 390 is lighter than RE 350 but one thing that brings the drastic change is the construction of Engine.

Duke 390 uses oversquare engine 80.0mm bore and a 60.0mm stroke.The stroke is shorter than bore which helps in faster movement of engine as the distance to be covered in up and down motion is less.So,engine revs fast thus helps in attaining higher top speed.

On the other hand Royal Enfiled 350 uses undersquare engine 70 mm bore and 90 mm stroke.With longer stroke the engine becomes slow as distance to be covered is more.But this results in increased torque as,Torque=Force x Distance.

So,in this case engine revs slow which result in increased torque.

Click here to know more about oversquare,undersquare and square engine.