Engineering Questions with Answers - Multiple Choice Questions

# Strength of Materials MCQs Dams Stability Analysis

1 - Question

To ensure economy in dam sections, the ______ should be minimum.
a) Base width
b) Top width
c) Spillway length
d) Toe of the wall

Explanation: In dams, the economy prevails if the cross section of a dam is provided with minimum base width. Base width “b” can be determined from the equation: b2 +ab+ a2 = H2/ S.

2 - Question

Calculate the maximum stress at the base section is the self weight is 4400 kN. The top and bottom width of them are 3 and 8 m respectively. Take (e) = 2.97.
a) 1658.15 kN/m2
b) 1775.12 kN/m2
c) 1897.45 kN/m2
d) 2336.67 kN/m2

Explanation: The maximum stress at the base section = W/b (1+6e/b)
P= 4400/8 (1+6×2.97/8)
= 1775.125 kN/m2.

3 - Question

If the maximum stress is positive, then the nature of stress is ____
a) Tensile
b) Shearing
c) Compressive
d) Bending

Explanation: If the stress developed in the dam section at the base is positive there it indicates the nature of stress to be compressive.

4 - Question

Determine the eccentricity of the dam section, if the base width of the dam be 6m. Take Z = 5.5m.
a) 2.5
b) 1.5
c) 3.5
d) 4.5

Explanation: e = Z – b/2. [The value of Z = 5.5m] = 5.5 – 6/2
= 5.5 – 3
= 2.5 m.

5 - Question

Calculate the minimum stress developed at the heel of the dam, if the self weight of the dam is 924 kN and the base with is 6 metres [Take e = 0.0945m].
a) 145 kN/m2
b) 139 kN/m2
c) 167 kN/m2
d) 183 kN/m2

Explanation: The minimum stress developed at the heel of the dam is W/b ×(1-6e/b).
= 920/6 ×(1-6×0.0945/6).
= 139 kN/m2.

6 - Question

The side slopes depend on ____________ conditions of a proposed dam.
a) Toe width
b) Height of foundation
c) Character of material
d) Free board allowance

Explanation: The upstream and downstream slopes of the Dam should be stable in all situations the side slopes depend upon
1.Height of the dam
2.Character of material
3.Nature of foundation.

7 - Question

Molitor’s formula can be used for calculation of ___________
a) Freeboard
b) Toe width
c) Wave height
d) Base drop

Explanation: The minimum height of the free board for wave action is generally taken to be equal to 1.5 hw. Where hw = height of wave action.
It can be calculated using 0.032(VF)1/2.

8 - Question

The height of the dam = free board + ___________
a) FTL
b) MWL
c) FRL
d) HFL

Explanation: The dam’s height mainly depends on HFL of the reservoir. The height of the dam above surface is given by the HFL plus the free board.
Height of the dam = HFL + free board.

9 - Question

_____________ sections allow the surplus discharge to flow in dams.
a) Mulching
b) Over reinforced
c) Breaching
d) Balanced

Explanation: Sometimes during construction, the surplus works are avoided in many tanks. In such circumstances, breaching sections are provided in the dams to allow the surplus flood discharge. With this the scouring of section can be avoided.

10 - Question

If the minimum stress developed is negative, then the nature of stress is ___________
a) Shearing
b) Tensile
c) Bending
d) Compressive

Explanation: If the minimum stress developed at the base of the dam section is negative, then the respective nature of the stress will be in tensile condition.

11 - Question

____________ creates concentrated seepage in dams section.
a) Longitudinal cracks
b) Transverse cracks
c) Construction cracks
d) Contraction cracks

Explanation: Due to differential settlement cracks may be developed in the bund. These are of two types 1) longitudinal cracks 2) transverse cracks. The transverse cracks are more dangerous to the dam section because they can create concentrated seepage.

12 - Question

The upstream slope recommended for sand and gravel with RCC core wall is __________
a) 1:2
b) 3:1
c) 2.5:1
d) 1.5:1

Explanation: According to Terazghi, the following upstream slopes should be recommended.
For:
1. Homogeneous well graded – 2.5 : 1
2. Homogeneous coarse silt – 3 : 1
3. Sand and gravel with RCC core wall – 2.5 : 1.

13 - Question

Major distributaries discharge varies from ____________
a) 0.25 to 5 cumecs
b) 2 to 4 cumecs
c) 1.5 to 5 cumecs
d) 1.2 to 5 cumecs

Explanation: The major distributary takes off from a branch canal to distribute the water to various parts of the field. The supply of the water varies from 0.25 to 5 cumecs.

14 - Question

Field channels are also known as ______
a) Branch canals
b) Slope channels
c) Water courses
d) Contour canals

Explanation: The water courses are the channel that carries irrigation water to the fields. The water courses derive their supply from distributaries through outlets. They are also called as field channels.

15 - Question

The structures constructed along are distributaries are called as _______
a) Inlets
b) Outlets
c) Distributaries
d) Channels

Explanation: An outlet is a simple and small irrigation structure which is constructed along the distributaries. The amount of water that is withdrawn through the outlet is in proportion to the area that is irrigated below respective point.

16 - Question

### Strength of Materials MCQs  Slope

Slope in the beam at any point is measured in ____________
a) Degrees
b) Minutes
d) Metric tonnes

Explanation: The slope is defined as at any point on the bent beam is the angle measured in terms of radians to which the tangent at that point makes with the x axis.

17 - Question

Elastic curve is also known as __________
a) Refraction curve
b) Reflection curve
c) Deflection curve
d) Random curve

Explanation: An elastic curve is defined as the line to which the longitudinal axis of a beam deviates under given load. It is also called a deflection curve.

18 - Question

Which of the following method is not used for determining slope and deflection at a point?
a) Moment area method
b) Double integration method
c) Isoheytal method
d) Macaulay’s method

Explanation: The method “Isoheytal” can be used for calculating run-off over an area. The remaining methods are effectively adopted to calculate the slope and deflection at a point in any type of beam.

19 - Question

The slope is denoted by _______
a) k
b) y
c) i
d) c

Explanation: The slope at any section in a deflection beam is defined as the angle measured in radians to the tangent at the section makes with the original axis of the beam.
•It is denoted by “i”.

20 - Question

Calculate the slope at supports, if the area is 180kNm2. Take flexural rigidity as 50000.

Explanation: Maximum slope at supports be i = A/EI
= 180/50000

21 - Question

In cantilever beams, the slope is _____________ at fixed end.
a) Maximum
b) Zero
c) Minimum
d) Uniform

Explanation: The slope in cantilever beam is zero at the fixed end of the cantilever and the slope is maximum at it’s free end. The slope is determined in the moment area method through Mohr’s theorems.

22 - Question

Slope is maximum at _______ in simply supported beams.
a) Mid span
b) Through out
c) Supports

Explanation: In case simply supported beams, the slope is maximum at the end supports of the beam and relatively zero at midspan of a symmetrically loaded beam.

23 - Question

Mohr’s theorem- 1 states ________
a) E/AI
b) I/EA
c) A/EI
d) A=EI

Explanation: According to Mohr’s theorem-1, the change of slope between any of the two points on and Elastic axis is equal to the net area of bending moment diagram (A) between these two points divided by flexural rigidity(EI).

24 - Question

Using Mohr’s theorem, calculate the maximum slope of a cantilever beam if the bending moment area diagram is 90kNm2. Take EI = 4000 kNm2.

Explanation: The maximum slope at free support (in cantilever beam) = i = A/EI
= 90/4000

25 - Question

Contour canals are also called as ______
a) Single bank canal
b) Ridge canal
c) Side slope canal
d) Watershed canal

Explanation: In this method, the canal is aligned along the falling contour. A generally higher side is left without bank. So it is also called a single bank canal. The contour canal cuts across the natural drainage courses.

26 - Question

______________ provides employment to the cultivators at the time of famine.
a) Productive canal
c) Protective canal
d) Inundation canal

Explanation: The construction of protective canals and their development may be started during summer in hence they provide employment to the farmers at the time of drought and famine. Protective canals are not remunerative as productive canals.

27 - Question

______________ bricks are used in the lining of blast furnaces.
a) Magnesia
b) Dolomite
c) Bauxite
d) Fly ash

Explanation: Bauxite bricks contain nearly 75% of aluminium and it is mixed with fire clay 15 to 30% and added some water to mould. High alumina bricks are resistant to corrosion.

28 - Question

_____________ bricks are resistant to corrosion.
a) silica bricks
b) magnesia bricks
c) bauxite bricks
d) fire bricks

Explanation: Bauxite bricks contain nearly 75% of aluminium and it is mixed with fire clay 15 to 30% and added some water to mould. High alumina bricks are resistant to corrosion.

29 - Question

_____________ bricks are used in the lining of electric furnace.
a) Frosterite
b) Spinel
c) Chrome
d) Basic

Explanation: The spinal bricks belong to neutral bricks. The spinel bricks mainly consist of alumina and magnesia. These bricks are widely used in the lining of electric furnace.

30 - Question

The finished product after burning magnesite is named as ___________
a) Perillax
b) Hellyx
c) Pyrolytaex
d) Syrilax

Explanation: The heating of magnesia bricks is continued in the same kiln after reaching the temperature of 1950°C, and then some amount of iron oxide is mixed. The finished product after burning magnesite is named as perillax.

31 - Question

### Strength of Materials MCQs Deflection

Units of deflection are _____
a) kNm
b) kN/m
c) kN
d) m

Explanation: The term “deflection” is defined as the transverse displacement of a point on any straight axis to the curved axis. It is expressed in metres (m).

32 - Question

Which of the following method is used to determine the slope and deflection at a point?
a) Arithmetic increase method
b) Mathematical curve setting
c) Macaulay’s method
d) Lacey’s method

Explanation: Macaulay’s method was devised by Mr WH Macaulay.
i. Gives one continuous expression for bending moment
ii. Constants of integration can be found by using end conditions
iii. By using this method, slope and deflection at any section can be determined throughout the length of the beam.

33 - Question

Deflection is denoted by _______
a) i
b) y
c) h
d) e

Explanation: The deflection of a point on the axis of the deflected beam is defined as the angle developed in radians with tangent at the section makes with the original axis of the beam.

34 - Question

In cantilever beams, the deflection is zero at ___________
a) Free and
b) Fixed end
c) At supports
d) Through out

Explanation: The deflection in cantilever beam is always zero at the fixed end and deflection in the cantilever beam at the free end is maximum.

35 - Question

Mohr’s theorem -¡¡ states?
a) Ax/EI
b) A/Ex
c) A/EI
d) Ae=Ix

Explanation: Mohr’s theorem -¡¡ states “the intercept taken on a vertical reference line of the tangent at any two points on an elastic line is equal to the moment of BMD between these points, about the reference line divided by flexural rigidity (EI).

36 - Question

Calculate the deflection if the slope is 0.0225 radians. Take the distance of centre of gravity of bending moment to free end as 2 metres.
a) 45mm
b) 35mm
c) 28mm
d) 49mm

Explanation: The deflection at any point on the elastic curve equal to Ax/EI
But, we know that A/EI is already slope equation.
So, slope × (the distance of centre of gravity of bending moment to free end = 2m).
0.0225 × 2
0.045m ~ 45 mm.

37 - Question

In simply supported beams, deflection is zero at _________
a) Mid span
b) Supports
c) Through out
d) Point of action of load

Explanation: The deflection is always zero at the supports and the deflection is maximum at the mid span of a symmetrically loaded simply supported beam.

38 - Question

Which of the following is not a cross drainage work?
a) Aqueduct
b) Level crossing
d) Super passage

Explanation: The head regulator is one of the canal regulation works. It can control the entry of silt into the canal. It can be used as a metre for measuring the discharge. It can shut out river floods.

39 - Question

Tail escape is also called as ___________
a) Outlet
b) Cross regulator
c) Weir type escape
d) Surplus escape

Explanation: The crest of the weir is fixed at canal FSL. When the water level rises above FSL, it is disposed of into the natural drain. Hence, the tale escape is also known as weir type escape.

40 - Question

The land where all the water comes from ___________
a) Ridge dam
b) Watershed
c) Meander
d) Groynes

Explanation: A watershed can be defined as an interconnected area of land which receives the water from surrounding ridge tops and transports it to a common point such as a lake or stream. All lands and waterways can be found within one watershed or another.

41 - Question

____________ reduces storm water discharge.
a) Rain water harvesting
b) Water harvesting
c) Watershed
d) Watershed management

Explanation: The water harvesting is defined as the process of capturing rain where it falls. The objectives of water harvesting are 1) To provide drinking water 2) To provide irrigation water 3) To increase groundwater recharge to reduce storm water discharge.

42 - Question

Which of the following is not a soil moisture conservation method?
b) Crop rotation
c) Recharge to ground water
d) By mulches

Explanation: The methods which are adopted for preserving the water in the soil from being lost are called as soil moisture conservation methods. The major part of the water is lost through evapotranspiration. The recharge to groundwater is one of the techniques in rainwater harvesting.

43 - Question

Nutrients like ca, mg, si, al, S, K are lost due to ____________
a) Soil erosion
b) Percolation
c) Water logging
d) Watershed

Explanation: The percolation is defined as a downward movement of water through the soil due to the force of gravity. The rapid percolation of water results in loss of plant nutrients and makes the soil acidic.

44 - Question

Warabandi has been practiced in India for more than ____________ years.
a) 130 years
b) 125 years
c) 140 years
d) 145 years

Explanation: Warabandi is a rotational method for allocation of the available water equally in an irrigation system. It provides continuous rotation of water generally lasts 7 days. It has been effectively practiced in India for more than 125 years.

45 - Question

Gold, Copper and lead are the examples of ______
a) Ductility
b) Creep
c) Plasticity
d) Malleability