# Strength of Materials Questions and Answers – Rivet Lap Joint

This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Rivet Lap Joint”.

1. What is the ratio of maximum deflection to maximum bending stress if a simply supported rectangular beam of span “L” and it carries a central load W.
a) L2/12 Ed
b) L2/10 Ed
c) L2/ 4 Ed
d) L2/ 6 Ed

Explanation: Maximum deflection in simply supported beam is y = Wl2/48EI
y= Wl3/48E (bd3/12)
y/f = l2/ 6Ed.

2. In a cantilever of span subjected to a point load of w acting at a distance of (1/3) L from free end. The deflection under load will be
a) WL3/81 EI
b) 14WL3/ 81EI
c) 8WL3/81EI
d) WL3/64 EI

Explanation: Deflection under load at B = W × (2L/3)3/ 3EI
= 8WL3/81EI.

3. The slabs whose corners are prevented from lifting are known as _________
a) simply supported
b) cantilever
c) restrained
d) suspended

Explanation: The slabs whose corners are prevented from lifting are called as restrained slabs. They may be supported on continuous or discontinuous edges.

4. As the corners are held down ___________ reinforcement has to be provided at the corners.
a) Tension
b) Shear
c) Torsional
d) Longitudinal

Explanation: Against lifting, the corners are held down then torsional reinforcement has to be provided at the corners (at the discontinuous edge) to prevent cracking of corners.

5. Which of the following layout is used for “Direct- Indirect system”.
b) Grid system
c) Reticulated system
d) Interlaced system

Explanation: The radial system is a reverse of the ring system, in this the water flows radially from one point to the outer periphery. The system is suitable where the roads are laid radially in the city.
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6. ________ layout is best suited for well planned towns.
a) Tree system
b) Ring system
c) Reticulated system

Explanation: In the ring system, the entire locality is divided into either rectangular or circular blocks. The water mains are laid along the peripheral roads with submains branching out from the main mains. Thus, every point can receive the supply from two directions. This is obviously the most Ideal system.

7. A ___ is used to prevent water from flowing back in the opposite direction.
a) Sluice valve
b) Check valve
c) Air valve
d) Drain valve

Explanation: Check valve is a valve which allows water to go in one direction only. The wall prevents the passage of water in the reverse direction. This valve is also known as Reflux valve.

8. Scour valve in water distribution system is provided at ________
a) High points
b) Junction points
c) Low points
d) Key points

Explanation: Scour valves are the ordinary valves which can be operated manually. These are similar to drain valves. These are located at the depressions and low ends to remove the accumulated silt.

9. _______ valves are known as “Washout ” valves.
a) Drain valves
b) Scour valves
c) Check valves
d) Sluice valves

Explanation: These are called as drain valves. They are provided at all dead ends and depressions of pipelines to drain out the wastewater. These are ordinary walls operated by hand.

10. Check valve is provided on the delivery side of a pipe.
a) False
b) True

Explanation: Check valve and pressure relief valves are provided on the delivery side because the reflux valve prevents the passage of water in a reverse direction. It allows the water to flow only one direction.

11. _____ reduces the pipe size from larger to smaller bore.
a) Aqua phone
b) Tee
c) Elbow
d) Reducer

Explanation: The component in the pipeline which reduces the pipe size from larger to smaller bore is known as reducer. Usually, there are two types of reducers: 1. concentric reducers 2. eccentric reducers.

12. The maximum pressure in (kg/cm2) to which cast iron pipes may be subjected is _________
a) 3
b) 7
c) 11
d) 14

Explanation: Cast iron pipes are widely used in water supply and sewage systems. They possess high durability, strength & resistant to corrosion etc. They are available in 1000 – 1200 mm in diameter. They can withstand upto a temperature of 7 kg/cm2.

13. The pipe extending from a stop cock to the storage tank is called ________
a) Supply pipe
b) Service pipe
c) Street main
d) Distribution pipe

Explanation: The pipe which is subjected to water pressure from the water main is called the supply pipe. The pipe extends from the stop cock up to the bib cock or entrance of the storage tank.

14. Calculate the elongation of the rod if you still out of 490 mm square area and 600 M long are subjected to an axial pull of 40 kN. Take E = 2×105N/mm2.
a) 0.56 mm
b) 0.78 mm
c) 0.24 mm
d) 0.16 mm

Explanation: Given that l = 600 mm, P = 40 kN.
The Elongation = Pl / AE
= 40000 × 600 / 490 × 2×102
= 0.24 mm.

15. The ratio of change in thickness to original thickness is known as ___________
a) Lateral strain
b) Linear strain
c) Longitudinal strain
d) Volumetric strain

Explanation: The lateral deformation per unit original lateral dimension is called a lateral strain. When a material is subjected to uniaxial stress within elastic limit it not only deforms longitudinally but also laterally.

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