Engg. Dwg App Q 2

The curve — is commonly used in teeth profile of helical gears, profile of cams etc.

• Involute

• Helix

• Spiral

• Cycloid

Explain the difference between a spiral and an Archimedean spiral based on the given explanation. A spiral is a curve traced by a point moving along a line in one direction, while the line is rotating in a plane about one of its ends or any point on it. In other words it is the locus of a point which moves around a centre, called the pole, while moving towards or away from the centre. The point which generates the curve is called the generating point or tracing point. The point will move along a line called the radius vector while the line itself rotates about one of its end points. Archimedean Spiral: The curve traced out by a point moving in such a way that its movement towards or away from the pole is uniform with the increase in the vectorial angle from the starting line.

• A spiral is traced by a point moving along a line in one direction, while an Archimedean spiral has uniform movement towards or away from the pole with the increase in the vectorial angle.

• A spiral and an Archimedean spiral are the same, both traced by a point moving along a line in one direction.

• A spiral is traced by a point moving along a line in one direction, while an Archimedean spiral is traced by a point moving along a line in the opposite direction.

• A spiral is traced by a point moving along a line in one direction, while an Archimedean spiral is traced by a point moving along a line without any rotation.

This type of projection is when projectors are parallel to each other, but are at an angle other than 90 degrees to the plane of projection:

• Orthographic projection

• Oblique projection

• Angular projection

• Isometric projection

Isometric view of equilateral triangle will be

• equilateral triangle

• scalene triangle

• isosceles triangle

• right angled triangle

A circle is placed at 20 degrees with vertical the view from top view will be

• line

• circle

• ellipse

• oval

A square plane is inclined to V.P. & perpendicular to H.P. its top view appears as

• Rhombus

• Square

• Inclined line

• Rectangle

When the line is parallel to VP and perpendicular to HP, we can get its true length in

• Top view

• Front view

• Side view

• Front view & Side view

Boyle’s law, PV = constant generates a curve which is a

• Hyperbola

• Rectangular hyperbola

• Parabola

• Rectangular parabola

Arcs of circle are dimensioned by their

• Diameter

• Length of arc

• Radii only not diameter

• All of these

A 500 sq.m area is represented by 600 sq.mm in a drawing. The scale of the drawing is :

• 1 mm = 100 m

• 1 mm = 5 m

• 1 mm = 1 m

• 1 mm = 10 m