This set of Civil Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Wooden and Steel Roof Truss”.
1. In timber roof figure shown below, the part represented by number 3 denotes __________
a) collar beam
b) arch braces
c) rafter
d) queen posts
View Answer
Explanation: Lacking a tie beam, the arch-braced (arched brace) truss gives a more open look to the interior of the roof. A double arch braced truss has a second pair of arched braces lower down, from the rafter to a block or inner sill: This form is called a wagon, cradle, barrel or tunnel roof because of this cylindrical appearance.
2. In timber roof figure shown below, the part represented by number 1 denotes _________
a) collar beam
b) principal rafters
c) queen posts
d) qrch braces
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Explanation: The principal rafters are linked by a collar beam supported by a pair of arch braces, which stiffen the structure and help to transmit the weight of the roof down through the principal rafters to the supporting wall.
3. In timber roof figure shown below, the part represented by number 2 denotes ____________
a) queen posts
b) collar beam
c) tie-beam
d) straining beam
View Answer
Explanation: The principal rafters are linked by a collar beam supported by a pair of arch braces, which stiffen the structure and help to transmit the weight of the roof down through the principal rafters to the supporting wall.
4. Figure shown below represents __________
a) fan truss
b) scissor truss
c) triangular truss
d) inclined truss
View Answer
Explanation: The scissor truss gets its name from being shaped like a pair of shears (scissors). Two defining features of a scissor truss are: 1) the joint where the bottom chords pass (the hinge of a pair of scissors) must be firmly connected and 2) the rafter (top chord) feet must land on the bottom chords. If the bottom chords join to the under-side of the top chords the assembly is said to be “scissor braced” rather than a scissor truss.
5. Figure shown below represents ____________
a) King Post truss
b) Howe truss
c) Studio truss
d) Fan truss
View Answer
Explanation: Just like you can see from many roof truss types pictures, the Fan Truss comes with a very simple design and it’s made out of steel. In this particular situation, the trusses form a fink roof truss. On top of that, the main characteristic here is that the top chords are split into smaller lengths, as this allows the build to obtain purlin support. Also, you get a medium span with this type, around 10-15m, which is more than enough for most projects.
6. The structure shown below as a whole represents _____________
a) Queen post truss
b) King post truss
c) Scissor Roof Truss
d) Trapezoidal truss
View Answer
Explanation: A queen post truss has two principal rafters and two vertical queen posts. The queen post truss extends the span, and combined with spliced joints in the longer members extends the useful span for trusses of these types. As with a king post, the queen posts may be replaced with iron rods and thus called a queen rod truss. This truss is often known as a palladiana (Palladian truss) in Italy, as it was frequently used by the Venetian architect Andrea Palladio. Sometimes a palladian truss is defined as a compound truss with a queen post and king post truss in the same assembly.
The queen post truss and the king post truss may be combined, by using the straining beam of the queen post truss as the tie beam for a king post truss above. Such combinations are known as compound trusses.
7. Figure below is a section of a roof, identify the type _________
a) Salt Box roof
b) Hammerbeam roof
c) Mansard Roof
d) Pyramid roof
View Answer
Explanation: The hammerbeam roof was the culmination of the development of the arch-braced truss, allowing greater spaces to be spanned. The hammerbeam roof of Westminster Hall in London, designed by Hugh Herland and installed between 1395 and 1399, was the largest timber-roofed space in medieval Europe, spanning a distance of just over 20 metres (66 ft). It is considered to be the best example of a hammer-beam truss in England.
Hammer beam trusses can have a single hammerbeam or multiple hammerbeams. A false hammerbeam roof (truss) has two definitions: 1) There is no hammer post on the hammer beam as sometimes found in a type of arch brace truss or; 2)The hammer beam joins into the hammer post instead of the hammer post landing on the hammer beam.
8. Which is one of the most efficient types of timber roof trusses?
a) Raised Heel Roof Truss
b) Quadrangular Roof Trusses
c) Parallel Chord Roof Truss
d) Scissor Roof Truss
View Answer
Explanation: This is one of the most efficient types of timber roof trusses, mostly because it brings a very good room for insulation, but at the same time it also provides you with a very good system for structural support. It might require some additional materials in order to make it bring the best results, not to mention that the costs can be a little higher when compared to other truss types, but it does help you lower the energy bill value, so keep that in mind.
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