What Is HT And VT?

When a point is above HP and behind VP it is in?

Projection of Points • There are basically nine type of projections of point is space : 1.

In FIRST Quadrant (Above H.P.

, In front of V.P.) 2.

In SECOND Quadrant (Above H.P.

, Behind V.P.) 3.

In THIRD Quadrant (Below H.P.

, Behind V.P.) 4..

Which pencil is best for drawing construction lines?

The softer the lead, the darker the image or line it will produce. For most drafting work, where clean, crisp lines are necessary, H and 2H leads are used. For sketching, softer leads are better, such as F and HB. Very soft leads, such as the B grades, are best for pencil renderings and shadowing work.

When the projectors are parallel to each other and also perpendicular to the plane is called?

Explanation: In orthographic projection, the projectors are parallel to each other and also perpendicular to the plane but in oblique projection, the projectors are inclined to the plane of projection and projectors are parallel to each other. … Explanation: Oblique projection is one method of pictorial projection.

What is HT and VT in engineering drawing?

Engineering Drawing Questions and Answers – Traces of a Line. … Explanation: The point of intersection of a line with horizontal plane is called horizontal trace, usually denoted by H.T. as this the point of intersection of a line with vertical plane is called vertical trace and denoted by V.T.

What is projection point?

Quadrant system: The picture planes used for obtaining the orthographic projections are called the Principal planes of projection or reference planes or co- ordinate planes of projection. VP: The plane in front of observer is the vertical plane. (VP) or it is also called a Frontal plane.

What is straight line in engineering drawing?

Thus a straight line is the basic conceptual. figure using which any object like a machine component or a structural element is represented. Thus projection of a straight line is the foundation of Engineering Drawing. projections of two points gives the projection of the straight line joining the two points.

What is a pencil used for in technical drawing?

Pencils. Pencil is used to draw on the paper. Any type of pencil is not suitable for drawing. There are some limitations, the drawing appearance should be very neat and understandable.

What is the projection of straight line?

PROJECTION OF LINES AND PLANES A straight line is the shortest distance between two points. Projections of the ends of any line can be drawn using the principles developed for projections of points. Top views of the two end points of a line, when joined, give the top view of the line.

What is apparent shape of section?

Sectional view : The projection of the section along with the remaining portion of the object is called a Sectional View. … Projection on the other plane is called apparent section. 2. True shape of the section : Projection of the section on a plane parallel to the section plane will show the true shape of the section.

How do you find true length?

To find the true length of a line you must take a view parallel to the line; in other words, if a line is a parallel to the folding line in one view, it is shown in true length in the adjacent view.

When a point is above HP its front view is?

1. When a point lies in the first quadrant, it will be above H.P. and in front of V.P. 2. When the point lies in the second quadrant, it will be above H.P. and behind V.P.

When the axis of solid is perpendicular to HP?

Explanation: When the axis of solid is perpendicular to H.P it is indirectly saying that the base is parallel to the horizontal plane so the projection on to it gives true shape of the base and then we can project and find the other dimensions. 4.

What is theory of projection?

Theory of Projections Projection theory. In engineering, 3-dimensonal objects and structures are represented graphically on a 2-dimensional media. The act of obtaining the image of an object is termed “projection”. The image obtained by projection is known as a “view”.

What is the difference between 1st and 3rd angle projection?

To get the first angle projection, the object is placed in the first quadrant meaning it’s placed between the plane of projection and the observer. For the third angle projection, the object is placed below and behind the viewing planes meaning the plane of projection is between the observer and the object.

What is true inclination?

The position of T.V. is a function of the True Inclination with the V.P., i.e., Φ. • If the F.V. of the line is T.L., then it must appear at an angle of θ with the xy line. The very moment ones sees a shorter length in the F.V., the apparent angle shall be larger than θ.

Is the softest pencil used in engineering drawing?

Drawing pencils are of different grades. The HB pencil is a soft grade used for drawing thick lines, borderlines, lettering and arrowheads. The H pencil is used to draw finishing lines, visible lines and hidden lines.

What are the hardest pencils?

The numbers indicate the hardness or softness of the pencil within their particular range. The H pencil range: The 9H pencil is the hardest and H pencil is the softest. The B pencil range: The 9B pencil is the softest, and the B pencil is the hardest.

What is 1st angle of projection?

First angle projection is a method of creating a 2D drawing of a 3D object. … This is important information for the person interpreting the drawing because if you examine the diagram below you will note that in first angle orthographic projection: the view from the front is in the middle.

When the object is in second quadrant The object is?

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.

How many battens will be there for a drawing board?

Explanation: Generally drawing board has dimensions of 1000 x 1500, 700 x 1000, 500 x 700, 350 mm x 500 mm, and made of well-seasoned soft wood, so there would be no bending while life increases. And also if a size of drawing board increases widely then the board will be fabricated with another 1 or 2 battens.