# Strength of Materials Questions and Answers – Thin Cylinder Internal Pressure

This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Thin Cylinder Internal Pressure”.

1. The stress acts tangential to circumference is called ______ stress.
a) Hoop
b) Fluid
c) Longitudinal
d) Yield

Explanation: The stress which is developed in the walls of the cylinder due to internal fluid pressure and which acts tangential to circumference is called hoop stress or circumferential stress.

2. The hoop stress is _____________ along the x axis.
a) Tensile
b) Parabolic
c) Compressed
d) Transverse

Explanation: Hoop stress is also known as circumferential stress and it is tensile along x-axis. The total pressure along the diameter of the shell P = intensity of stress × Area.

3. The cylinder has a tendency to split up along _____________ due to circumferential stress.
a) Area
c) Diameter
d) Length

Explanation: As a result of circumferential stress a cylinder has a tendency to split up along its diameter. Because of hoop stress, the failure is a longitudinal failure.

4. ____________ is half the circumferential stress.
a) Hoop stress
b) Longitudinal stress
c) Fluid stress
d) Transverse stress

Explanation: Longitudinal stress is developed along the walls of the cylinder in the shell due to internal fluid pressure on the ends. The longitudinal stress is half the circumferential stress.

5. Which of the following is also known as axial stress?
a) Shear stress
b) Longitudinal stress
c) Bending stress
d) Hoop stress

Explanation: The stress which is developed due to internal fluid pressure on the ends is known as longitudinal stress. As a result of longitudinal stress, the cylinder has a tendency to be turn away longitudinally. It is also known as axial stress.

6. The layers of wood wearing thickness from ____________ to __________ is called veneers.
a) 0.4 to 0.6 mm
b) 0.5 to 0.8 mm
c) 0.4 to 0.6 mm
d) 0.5 to 0.7 mm

Explanation: The layers or slices of wood varying thickness from 0.4 to 0.6 mm or more are called veneers. They are obtained by rotating a log of wood against a sharp knife.

7. _____________ is used as decorative facings.
a) Plywood
b) Veneers
c) Ply ware
d) Battens

Explanation: Veneers are used in construction where light weight, moderate strength, non shrinkage and non splitting properties are required. Veneers are used for decorative facings.

8. Which of the following is known as block board?
a) Batten board
b) Plywood
c) Fiber board
d) Veneer

Explanation: The strips which are glued together between two veneers one on either side are known as batten boards. The board is made with 25 mm with strips. It is also known as block board.

9. Which of the following is also known as pressed woods?
a) Ply wood
b) Ply ware
c) Batten board
d) Fiber wood

Explanation: The boards which are made by pressing the mixture of saw dust, fibres of wood and glue are known as fibre boards or pressed woods or reconstructed wood.

10. Which of the following boards are used in making partitions covering?
a) Lamin boards
b) Particle boards
c) Straw boards
d) Eco board

Explanation: The laminated boards having a core of strips not exceeding 7 mm thickness are glued together between two or more veneers are called laminated boards. Laminated boards are used in making partitions covering, packing cases and for floor coverings.

11. ____________ boards are manufactured from sugarcane waste obtained from bagasse.
a) Eco board
b) Straw board
c) Lamin board
d) Particle board

Explanation: Eco board is manufactured from sugarcane waste obtained from sugar factory known as “Bagasse”. These bagasse balls are broken into required small size particles. These boards possess the following advantages:
i. These are durable
ii. They possess good strength and workability.

12. Plastic is a ____________ substance.
a) Eco friendly
b) Inorganic
c) Organic
d) Natural

Explanation: The plastic is one of the recent engineering materials which are widely used. The plastic is an organic substance made up of natural or synthetic resins.

13. Plastic possess tensile strength of _______________
a) 4.2 tonnes/cm2
b) 5.6 tonnes/cm2
c) 3.4 tonnes/cm2
d) 4.8 tonnes/cm2

Explanation: Plastic can withstand wear and tear due to abrasion. The plastics are highly resistant to corrosion. They possess tensile strength about 5.6 tonnes per centimetre square (5.6 tonnes/cm2).

14. ________ is an example of thermoplastic.
a) Shellac
b) Bakelite
c) Phenol formaldehyde
d) Urea formaldehyde

Explanation: Thermoplastic softens by heating and hardens when cooled. This variety of plastic can be used by remoulding many numbers of times as required. The commercial forms of thermoplastic are shellac, vinyl plastics, and acrylic.

15. What is the minimum percentage of reinforcement provided in mild steel?
a) 0.12 % of gross area
b) 0.15 % of gross area
c) 0.18 % of gross area
d) 0.2 % of gross area

Explanation: As per IS 456 – 2000,
0.12 % of gross area is required for HYSD bars [Tor steel] 0.15 % of gross area is required for mild steel.

Sanfoundry Global Education & Learning Series – Strength of Materials.

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