This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Trusses – 1”.
1. __________ is a framed structure composed of members.
a) Purlin
b) Gussets
c) Ridge tops
d) Truss
View Answer
Explanation: A truss is defined as a framed structure composed of members connected to each other at their ends and forming triangles which lie in the same plane.
2. Trusses are subjected to ___________ stress.
a) Compressive
b) Tensile
c) Direct
d) Lateral
View Answer
Explanation: Trusses are the members which are subjected to direct stress, as the truss is usually loaded at the point of intersection of its member only.
3. Trusses are adopted for ___________ span.
a) Medium
b) Short
c) Very large
d) Large
View Answer
Explanation: Trusses are useful at the places of high rainfall to avoid roof drainage problems. For very large span the use of beams will make the construction most uneconomical.
4. The top line of roof truss is called as ___________
a) Eves
b) Main tie
c) Pitch
d) Ridge line
View Answer
Explanation: The top line of the roof truss is called “ridge line”. The bottom edge of roof surface is called a ridge line. Corrugated galvanised iron (GI) or asbestos cement (AC) sheets are commonly used for roof covering.
5. If the members connected don’t lie in the same plane, then structures are called __________
a) Space truss
b) Plane truss
c) Main truss
d) Foot truss
View Answer
Explanation: If all the members connected at the ends do not lie in the same plane then the structure (truss) is called as space truss. If the members lie in the same plane, then the structure is called plane truss.
6. King post trusses are used for spans ______
a) 5 to 8 m
b) 6 to 9 m
c) 4 to 6 m
d) 6 to 8 m
View Answer
Explanation: Generally trusses are used when the span is large and intermediate supports for purlins and ties are unavailable. A king post truss is used for spans of 6 to 9 m.
7. ________ shape of the frame offers great rigidity.
a) Trapezoidal
b) Triangular
c) Rectangular
d) Square
View Answer
Explanation: The framework of the truss should be built in a way that, it does not change its shape when loaded. The triangular shape of frame offers great rigidity and hence it is generally adopted.
8. Which of the following roof are used on small sheds and veranda opening?
a) Couple roof
b) Collar roof
c) Pent roof
d) Purlin roof
View Answer
Explanation: Pent roof is one of the simplest forms of pitched roofs. The sort of sloping roof consists of common rafters which are generally inclined at 30°. It is suitable for span up to 2.5 m. It is widely used on small sheds and veranda openings.
9. The joints in king post are of ________
a) Butt
b) Welded
c) Mortice and tenon
d) Lap
View Answer
Explanation: The joint between the principal rafter and the king post is made by making tenon in the principal rafter and a corresponding mortice into the head of the king post. The joint is further strengthened by an iron stirrup.
10. About ____________ % volume of concrete is occupied by aggregates.
a) 60%
b) 50%
c) 75%
d) 30%
View Answer
Explanation: Around 75% volume of concrete is occupied by aggregates. Hence the structural behaviour of concrete is significantly influenced by the type of aggregates used. The aggregate used for the concrete should be durable, strong, hard and well graded.
11. Which of the following cement is used for marine structures?
a) Rapid hardening cement
b) Hydrophobic cement
c) High Alumina cement
d) Super sulphated cement
View Answer
Explanation: High Alumina cement is used for marine structures.
| Type of Cement | Usage |
|---|---|
| Rapid hardening cement | Road works and repairs |
| Hydrophobic cement | Swimming pools and food processing plants |
| High Alumina cement | Marine structures |
12. IS: 455 is associated with ____________
a) Portland slag cement
b) Ordinary Portland cement
c) High alumina cement
d) Super sulphated cement
View Answer
Explanation: IS: 455 is associated with Portland slag cement.
| Type of Cement | IS Code |
|---|---|
| Portland slag cement | IS 455 |
| Ordinary Portland cement | IS 269 |
| High alumina cement | IS 6452 |
13. Which of the following is used as retarding admixture?
a) Calcium chloride
b) Fluosilicates
c) Treitanlamine
d) Starch
View Answer
Explanation: Retarding admixtures are added to slow down the rate of setting of cement. They are useful in hot weather concreting. The common types of retarders are cellulose products, sugar starch etc.
14. Polyhydroxy compounds are ________
a) Accelerating admixtures
b) Retarding admixtures
c) Water reducing admixtures
d) Air entraining admixtures
View Answer
Explanation: Polyhydroxy compounds are Water reducing admixtures.
| Type of Admixture | Materials |
|---|---|
| Accelerating | Calcium chloride, fluosilicates |
| Water reducing | Lignosulphonate,polyhydroxyl |
| Retarding | Sugar, hydroxyl-carboxylic acid |
15. Plasticizing admixture means __________
a) Accelerating admixtures
b) Water reducing admixtures
c) Air in training admixtures
d) Superplasticizers
View Answer
Explanation: In water reducing admixtures, the addition of plasticizer allows greater workability for given water cement ratio or alternatively retains workability while reducing the water content. They are also called as plasticizing admixtures.
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