D23 QUIZ OF THE DAY

What is the purpose of an arch in construction? [Q1]

• To act as foundation support
• To span across an opening and transfer load
• To serve as roof covering
• To provide ventilation

Answer explanation

An arch spans an opening and transfers the load to the supports.

Which term refers to the inner curve of an arch? [Q2]

• Extrados
• Soffit
• Intrados
• Key

Answer explanation

The intrados is the inner curve of an arch.

What is the 'key' in an arch? [Q3]

• End support of arch
• Intermediate support
• Highest voussoir at crown
• Lower half of arch

Answer explanation

The key is the wedge-shaped unit fixed at the crown of the arch.

Which type of arch is used for light loading up to 1.5 m span? [Q4]

• Bull’s eye arch
• Segmental arch
• Flat arch
• Inverted arch

Answer explanation

Flat arches are used for short spans and light loads.

What is a Venetian arch characterized by? [Q5]

• Having three centers
• Greater springing depth than crown
• Four centers and deeper crown
• Circular intrados

Answer explanation

Venetian arch has 4 centers and crown depth > springing line.

Which arch consists of three centers and a reverse curve? [Q6]

• Segmental arch
• Florentine arch
• Ogee arch
• Drop arch

Answer explanation

Ogee arch has three centers and a reverse S-shaped curve.

What is the haunch of an arch? [Q7]

• Top part of arch above crown
• Horizontal member below arch
• Lower half of the arch
• End face of extrados

Answer explanation

The haunch is the lower portion of the arch between springing and the crown.

The horizontal distance between the supports of an arch is called: [Q8]

• Rise
• Span
• Depth
• Thickness

Answer explanation

Span is the horizontal clear distance between the supports of the arch.

What are voussoirs in an arch? [Q9]

• Supporting beams
• Vertical bars
• Wedge-shaped masonry units
• Brick layers

Answer explanation

Voussoirs are wedge-shaped blocks forming the arch ring.

Which component supports the ribs in timber centering of an arch? [Q10]

• Braces
• Lagging
• Props
• Folding wedges

Answer explanation

Props are vertical members that support ribs and transfer loads to the ground.