ENGINEERING DRAWING - PROJECTION OF SOLIDS (QUESTION POOL

The sum of interior angles of a hexagon is

• 720^o
• 105^O
• 120^O
• 150^O

Answer explanation

The sum of internal angles of a polygon is = 180(n-2) The total number of sides in a hexagon =6 The sum of internal angles = 180(6-2) = 720^o One interior angle of a hexagon = 720^o/6 =120^o

A sphere is obtained by

• Revolving a semi-circle
• Revolving a quarter-circle
• Revolving a circle
• Revolving a sector

Answer explanation

Sphere -A sphere is obtained by revolving a semi-circle Cylinder -A cylinder is obtained by revolving a rectangle Cone -A cone is obtained by revolving a right angled triangle

One interior angle of a dodecagon is

• 150^O
• 105^O
• 165^O
• 135^O

Answer explanation

The sum of internal angles of a polygon is = 180(n-2) The total number of sides in a dodecagon = 12 The sum of internal angles = 180(12-2) = 1800^o One interior angle of a dodecagon = 1800^o/12 =150^o

When a tetrahedron is in simple position is cut by a horizontal plane, the cut section is

• Any triangle
• an isosceles triangle
• An equilateral triangle
• A circle

Answer explanation

Tetrahedron consists of four equal equilateral triangles.Hence , when a tetrahedron is in simple position cut by a horizontal plane , the cut section is an equilateral triangle.

A cylinder is resting on HP on curved face with axis parallel to VP, the elevation is

• A line parallel to XY line
• rectangle
• Circle
• A line normal to XY line

A cylinder is resting on HP on curved face with axis normal to VP, the elevation is

• circle
• rectangle
• A straight
• A point

The plan of a tetrahedron resting on HP on its base is 

• rectangle
• isosceles triangle
• Equilateral triangle
• A line

Answer explanation

A tetrahedron is composed of four faces of equal equilateral triangle. Hence when it is resting on HP, its plan is an equilateral triangle.

Take the odd one out

• Sphere
• Cone
• Cylinder
• Cube

Answer explanation

Sphere,cone and cylinder are all solids of revolution. Cube or hexahedron belongs to polyhedron or polyhedra.

Solid formed by 12 regular pentagons is 

• Icosahedron
• Hexahedron
• Tetrahedron
• Dodecahedron

Answer explanation

Icosahedron consists of 20 equal equilateral triangles as faces. Hexahedron consists of 6 equal squares as faces. Tetrahedron consists of 4 equal equilateral triangles as faces. Dodecahedron consists of 12 regular pentagons.

In poly cylindric method, solids are cut into 

• Vertical planes
• horizontal planes
• Inclined planes
• Frustum of right circular cone

Answer explanation

In poly cylindric method, solids are cut into Vertical planes. In poly conic method, solids are cut into horizontal planes. Poly cylindric method is also known as Lune method or Gore method. Poly conic method is also known as zone method. For the development of Sphere this methods were used.